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148-475: Entente victory 2,000,000 Persian civilians dead from famine exacerbated by Russian, British, and Ottoman occupation The Middle Eastern theatre of World War I saw action between 30 October 1914 and 30 October 1918. The combatants were, on one side, the Ottoman Empire (including the majority of Circassians and Kurdish tribes , some Arabs , and some Iranian peoples), with some assistance from

296-764: A British Expeditionary Force of 100,000 men would be landed in France; in addition, the Royal Navy would be responsible for the North Sea , the Channel and protecting Northern France, with the French navy concentrated in the Mediterranean . Britain was committed to support France in a war against Germany but this was not widely understood outside government or the upper ranks of the military. As late as 1 August,

444-533: A Chief of Staff, an operations section, intelligence section, logistics section and a personnel section. As a long established tradition in the Ottoman military, supply, medical and veterinary services were included in these armies. Before the war, the Turkish General Staff estimated that 1,000,000 men could be mobilized at one time and that 500,000 of these were available as mobile field armies, with

592-740: A German ultimatum demanded unimpeded progress through any part of Belgium, which was refused. Early on the morning of 4 August, the Germans invaded and the Belgian government called for British assistance under the 1839 Treaty; by the end of 1914, over 95% of the country was occupied but the Belgian Army held their lines on the Yser Front throughout the war. Hydrocarbon reservoir Reservoirs are broadly classified as conventional and unconventional reservoirs. In conventional reservoirs,

740-445: A cap rock) is a fundamental part of the trap that prevents hydrocarbons from further upward migration. A capillary seal is formed when the capillary pressure across the pore throats is greater than or equal to the buoyancy pressure of the migrating hydrocarbons. They do not allow fluids to migrate across them until their integrity is disrupted, causing them to leak. There are two types of capillary seal whose classifications are based on

888-492: A clear majority of the Liberal government and its supporters wanted to stay out of the war. While Liberal leaders H. H. Asquith and Edward Grey considered Britain legally and morally committed to support France regardless, waiting until Germany triggered the 1839 Treaty provided the best chance of preserving Liberal party unity. The German high command was aware entering Belgium would lead to British intervention but decided

1036-406: A consequence, oil and natural gas are often found together. In common usage, deposits rich in oil are known as oil fields, and deposits rich in natural gas are called natural gas fields. In general, organic sediments buried in depths of 1,000 m to 6,000 m (at temperatures of 60 ° C to 150 °C) generate oil, while sediments buried deeper and at higher temperatures generate natural gas. The deeper

1184-407: A few, very large offshore drilling rigs, due to the cost and logistical difficulties in working over water. Rising gas prices in the early 21st century encouraged drillers to revisit fields that previously were not considered economically viable. For example, in 2008 McMoran Exploration passed a drilling depth of over 32,000 feet (9754 m) (the deepest test well in the history of gas production) at

1332-888: A lasting postwar settlement demanded full Russian possession of the capital city of the Ottoman Empire, Constantinople , the straits of the Bosphorus and Dardanelles , the Sea of Marmara , southern Thrace up to the Enos-Midia line as well as parts of the Black Sea coast of Anatolia between the Bosphorus, the Sakarya River and an undetermined point near the Bay of Izmit . The Russian Imperial government planned to replace

1480-560: A new recruitment law on 12 May 1914. This lowered the conscription age from 20 to 18, and abolished the "redif" or reserve system. Active duty lengths were set at two years for the infantry, three years for other branches of the Army and five years for the Navy. These measures remained largely theoretical during the war. Traditional Ottoman forces depended on volunteers from the Muslim population of

1628-471: A result of changes in the structure of the subsurface from processes such as folding and faulting , leading to the formation of domes , anticlines , and folds. Examples of this kind of trap are an anticline trap, a fault trap, and a salt dome trap. They are more easily delineated and more prospective than their stratigraphic counterparts, with the majority of the world's petroleum reserves being found in structural traps. Stratigraphic traps are formed as

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1776-435: A result of lateral and vertical variations in the thickness, texture, porosity, or lithology of the reservoir rock. Examples of this type of trap are an unconformity trap, a lens trap and a reef trap. Hydrodynamic traps are a far less common type of trap. They are caused by the differences in water pressure, that are associated with water flow, creating a tilt of the hydrocarbon-water contact. The seal (also referred to as

1924-548: A route into the crumbling Ottoman Empire, where Germany also had significant interests. Combined with the increase in Russian military strength, both Austria and Germany felt threatened by Serbian expansion; when Austria invaded Serbia on 28 July 1914, Russian Foreign Minister Sergey Sazonov viewed it as an Austro-German conspiracy to end Russian influence in the Balkans. In addition to its own territory, Russia viewed itself as

2072-502: A significantly higher displacement pressure such that the pressure required for tension fracturing is actually lower than the pressure required for fluid displacement—for example, in evaporites or very tight shales. The rock will fracture when the pore pressure is greater than both its minimum stress and its tensile strength then reseal when the pressure reduces and the fractures close. Unconventional (oil & gas) reservoirs are accumulations where oil and gas phases are tightly bound to

2220-405: Is an area of accumulated liquid petroleum underground in multiple (potentially linked) reservoirs, trapped as it rises to impermeable rock formations. In industrial terms, an oil field implies that there is an economic benefit worthy of commercial attention. Oil fields may extend up to several hundred kilometers across the surface, meaning that extraction efforts can be large and spread out across

2368-402: Is analogous to saying that the oil which can be extracted forms within the source rock itself, as opposed to accumulating under a cap rock. Oil sands are an example of an unconventional oil reservoir. Unconventional reservoirs and their associated unconventional oil encompass a broad spectrum of petroleum extraction and refinement techniques, as well as many different sources. Since the oil

2516-403: Is being pursued at a higher rate because of the scarcity of conventional reservoirs around the world. After the discovery of a reservoir, a petroleum engineer will seek to build a better picture of the accumulation. In a simple textbook example of a uniform reservoir, the first stage is to conduct a seismic survey to determine the possible size of the trap. Appraisal wells can be used to determine

2664-452: Is best to manage the gas cap effectively, that is, placing the oil wells such that the gas cap will not reach them until the maximum amount of oil is produced. Also a high production rate may cause the gas to migrate downward into the production interval. In this case, over time the reservoir pressure depletion is not as steep as in the case of solution-based gas drive. In this case, the oil rate will not decline as steeply but will depend also on

2812-426: Is called the stock tank oil initially in place . As a result of studying factors such as the permeability of the rock (how easily fluids can flow through the rock) and possible drive mechanisms, it is possible to estimate the recovery factor, or what proportion of oil in place can be reasonably expected to be produced. The recovery factor is commonly 30–35%, giving a value for the recoverable resources. The difficulty

2960-490: Is contained within the source rock, unconventional reservoirs require that the extracting entity function as a mining operation rather than drilling and pumping like a conventional reservoir. This has tradeoffs, with higher post-production costs associated with complete and clean extraction of oil being a factor of consideration for a company interested in pursuing a reservoir. Tailings are also left behind, increasing cleanup costs. Despite these tradeoffs, unconventional oil

3108-593: Is shared between Iran and Qatar . The second largest natural gas field is the Urengoy gas field , and the third largest is the Yamburg gas field , both in Russia . Like oil, natural gas is often found underwater in offshore gas fields such as the North Sea , Corrib Gas Field off Ireland , and near Sable Island . The technology to extract and transport offshore natural gas is different from land-based fields. It uses

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3256-413: Is that reservoirs are not uniform. They have variable porosities and permeabilities and may be compartmentalized, with fractures and faults breaking them up and complicating fluid flow. For this reason, computer modeling of economically viable reservoirs is often carried out. Geologists, geophysicists, and reservoir engineers work together to build a model that allows simulation of the flow of fluids in

3404-940: Is usually necessary to drill into the Earth's crust, although surface oil seeps exist in some parts of the world, such as the La Brea Tar Pits in California and numerous seeps in Trinidad . Factors that affect the quantity of recoverable hydrocarbons in a reservoir include the fluid distribution in the reservoir, initial volumes of fluids in place, reservoir pressure, fluid and rock properties, reservoir geometry, well type, well count, well placement, development concept, and operating philosophy. Modern production includes thermal , gas injection , and chemical methods of extraction to enhance oil recovery. A virgin reservoir may be under sufficient pressure to push hydrocarbons to

3552-694: The Administration for Western Armenia and later Republic of Mountainous Armenia were Armenian-controlled entities, while the Centrocaspian Dictatorship was established with Armenian participation. None of these entities were long lasting. The principal actor was King Hussein as head of the Kingdom of Hejaz . He led what is now called the Arab revolt , the principal objectives of which were self-rule and an end to Ottoman control of

3700-867: The Admiralty that did the same for the Royal Navy . Theatre commanders like Douglas Haig on the Western Front or Edmund Allenby in Palestine then reported to the CIGS. After the Indian Army, the largest individual units were the Australian Corps and Canadian Corps in France, which by 1918 were commanded by their own generals, John Monash and Arthur Currie . Contingents from South Africa, New Zealand and Newfoundland served in theatres including France, Gallipoli , German East Africa and

3848-983: The Armenian resistance supported by Russia during the War; along with Armenian volunteer units , the Armenian militia formed the Armenian Corps of the First Republic of Armenia in 1918. In addition, the Assyrians joined the Allies and saw action in Southeastern Turkey, northern Mesopotamia (Iraq), northwestern Iran and northeastern Syria following the Assyrian genocide , instigating the Assyrian war of independence . Turks were persecuted by

3996-702: The Armistice of Mudros was signed on 30 October 1918. Over 90,000 Ottoman troops were sent to the Eastern European Front in 1916, to participate in operations in Romania in the Balkans Campaign . The Central Powers asked for these units to support their operations against the Russian army. Later, it was concluded that the deployment was a mistake, as these forces would have been better placed remaining to protect Ottoman territory against

4144-640: The Army Groups in 1918 were smaller than the armies of 1914. The Ottoman Army was still partially effective until the end of the war. Most military equipment was manufactured in Germany or Austria, and maintained by German and Austrian engineers. Germany also supplied most of the military advisers; a force of specialist troops (the Asia Korps ) was dispatched in 1917, and increased to a fighting force of two regiments in 1918. The German Caucasus Expedition

4292-603: The Army of Islam , which had only a single corps, in 1918. By 1918, the original armies had been so badly reduced that the Empire was forced to establish new unit definitions which incorporated these armies. These were the Eastern Army Group and Yildirim Army Group . However, although the number of armies was increasing over the four years of the war, the Empire's resources of manpower and supplies were declining, so that

4440-935: The Assyrian volunteers or Our Smallest Ally During the peace conferences in Paris in 1919, the Assyrian delegation asked for a state in Diyarbekir Vilayet and northern Mesopotamia in Iraq, others requested a British protectorate in Upper Mesopotamia , northern Mosul, and Urmia. This was however rejected by Great Britain and the U.S. delegates. In 1924 the Assyrians tried to retake their ancestral lands in Hakkari resulting in an Assyrian rebellion that failed, after Turkey formally occupied Hakkari they expelled

4588-686: The Balkan League to prevent further Austrian expansion. Austria viewed Serbia with hostility partly due to its links with Russia, whose claim to be the protector of South Slavs extended to those within the Austro-Hungarian Empire, such as the Czechs and Slovaks . Serbia also potentially gave Russia the ability to achieve their long-held objective of capturing Constantinople and the Dardanelles . Austria-Hungary supported

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4736-716: The British Empire , many of whom made significant contributions to the Allied war effort, both in the provision of troops and civilian labourers. It was split into Crown Colonies administered by the Colonial Office in London, such as Nigeria , and the self-governing Dominions of Canada , Newfoundland , New Zealand , Australia and South Africa . These controlled their own domestic policies and military expenditure but not foreign policy. In terms of population,

4884-991: The British Indian Army served in different theatres of the war, primarily France and the Middle East . From 1914 to 1916, overall Imperial diplomatic, political and military strategy was controlled by the British War Cabinet in London; in 1917 it was superseded by the Imperial War Cabinet , which included representatives from the Dominions. Under the War Cabinet were the Chief of the Imperial General Staff or CIGS , responsible for all Imperial ground forces, and

5032-777: The Central Powers of Germany , Austria-Hungary , the Ottoman Empire , and Bulgaria in World War I (1914–1918). By the end of the first decade of the 20th century, the major European powers were divided between the Triple Entente and the Triple Alliance . The Triple Entente was made up of the United Kingdom, France, and Russia. The Triple Alliance was originally composed of Germany, Austria–Hungary, and Italy, but Italy remained neutral in 1914. As

5180-466: The Fourth Army with four divisions. In August 1914, of 36 infantry divisions organised, fourteen were established from scratch and were essentially new divisions. In a very short time, eight of these newly recruited divisions went through major redeployment. During the war, more armies were established; 5th Army and 6th Army in 1915, 7th Army and 8th Army in 1917, and Kuva-i İnzibatiye and

5328-661: The French (with its North African and West African Muslim, Christian and other colonial troops) from among the Allied Powers . There were five main campaigns: the Sinai and Palestine , Mesopotamian , Caucasus , Persian , and Gallipoli campaigns . Both sides used local asymmetrical forces in the region. On the Allied side were Arabs who participated in the Arab Revolt and the Armenian militia who participated in

5476-683: The League of the Three Emperors , then with Germany in the 1887–1890 Reinsurance Treaty ; both collapsed due to the competing interests of Austria and Russia in the Balkans . While France took advantage of this to agree the 1894 Franco-Russian Alliance , Britain viewed Russia with deep suspicion; in 1800, over 3,000 kilometres separated the Russian Empire and British India, by 1902, it was 30 km in some areas. This threatened to bring

5624-403: The Mariana , Caroline , and Marshall Islands , while in 1917, a Japanese naval squadron was sent to support the Allies in the Mediterranean Sea . Japan's primary interest was in China and in January 1915, the Chinese government was presented with a secret ultimatum of Twenty-One Demands , demanding extensive economic and political concessions. While these were eventually modified, the result

5772-470: The Paris Peace Conference recognized the United Kingdom, France, Italy, Japan, and the United States as "the Principal Allied and Associated Powers". When the war began in 1914, the Central Powers were opposed by the Triple Entente , formed in 1907 when the agreement between the United Kingdom and Russia complemented existing agreements between the three powers. Fighting commenced when Austria invaded Serbia on 28 July 1914, purportedly in response to

5920-479: The Sykes-Picot Agreement , which was still secret. Boghos Nubar , the leader of the Armenian national assembly , met with Sir Mark Sykes and Georges-Picot. General Edmund Allenby , the commander of the Egyptian Expeditionary Force, extended the original agreement. The Armenian Legion fought in Palestine and Syria. Many of its volunteers were later released from the Legion to join their respective national armies. The Armenian national liberation movement commanded

6068-402: The Treaty of Brest-Litovsk on 3 March 1918. Romania was forced to do the same in the May 1918 Treaty of Bucharest but on 10 November, it repudiated the Treaty and once more declared war on the Central Powers. These changes meant the Allies who negotiated the Treaty of Versailles in 1919 included the United Kingdom, France, Italy, Japan and the United States; Part One of the Treaty agreed to

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6216-442: The Trebizond Peace Conference (14 March 1918) which resulted in the Treaty of Batum on 4 June 1918. The Ottomans accepted the Armistice of Mudros with the Allies on 30 October 1918, and signed the Treaty of Sèvres on 10 August 1920 and later the Treaty of Lausanne on 24 July 1923. The Ottoman Empire joined the Central Powers through the secret German–Ottoman alliance , which was signed on 2 August 1914. The main objective of

6364-459: The Yser Front throughout the war. This allowed Belgium to be treated as an Ally, in contrast to Luxembourg which retained control over domestic affairs but was occupied by the German military . In the East, between 7 and 9 August the Russians entered German East Prussia on 7 August, Austrian Eastern Galicia . Japan joined the Entente by declaring war on Germany on 23 August, then Austria on 25 August. On 2 September, Japanese forces surrounded

6512-434: The aquatic ecosystem , which is usually a sea but might also be a river, lake, coral reef, or algal mat , the formation of an oil or gas reservoir also requires a sedimentary basin that passes through four steps: Timing is also an important consideration; it is suggested that the Ohio River Valley could have had as much oil as the Middle East at one time, but that it escaped due to a lack of traps. The North Sea , on

6660-402: The assassination of Archduke Franz Ferdinand , heir to Emperor Franz Joseph I ; this brought Serbia's ally Montenegro into the war on 8 August and it attacked the Austrian naval base at Cattaro , modern Kotor. At the same time, German troops carried out the Schlieffen Plan , entering neutral Belgium and Luxembourg ; over 95% of Belgium was occupied but the Belgian Army held their lines on

6808-407: The buoyancy forces driving the upward migration of hydrocarbons through a permeable rock cannot overcome the capillary forces of a sealing medium. The timing of trap formation relative to that of petroleum generation and migration is crucial to ensuring a reservoir can form. Petroleum geologists broadly classify traps into three categories that are based on their geological characteristics:

6956-401: The 19th century, Britain sought to maintain the European balance of power without formal alliances, a policy known as splendid isolation . This left it dangerously exposed as Europe divided into opposing power blocs and the 1895–1905 Conservative government negotiated first the 1902 Anglo-Japanese Alliance , then the 1904 Entente Cordiale with France. The first tangible result of this shift

7104-405: The Armenian Fedayee ( Armenian : Ֆէտայի ) during these conflicts. These were generally referred to as Armenian militia . In 1917, The Dashnaks established an Armenian Corps under the command of General Tovmas Nazarbekian which, with the declaration of the First Republic of Armenia , became the military core of this new Armenian state. Nazarbekian became the first Commander-in-chief. Before

7252-431: The Armenians. According to some estimates, about ten to twenty thousand Armenians were slaughtered by the Hamidiye units. In other instances local Kurds joined with Turkish forces not out of loyalty but to share in the spoils taken from Armenian civilians. According to historian Raymond Kévorkian , while many nomadic Kurdish tribes actively participated in the genocide, settled Kurds rarely did so. Many Kurds also opposed

7400-510: The Blackbeard site in the Gulf of Mexico. ExxonMobil 's drill rig there had reached 30,000 feet by 2006, without finding gas, before it abandoned the site. Crude oil is found in all oil reservoirs formed in the Earth's crust from the remains of once-living things. Evidence indicates that millions of years of heat and pressure changed the remains of microscopic plants and animals into oil and natural gas. Roy Nurmi, an interpretation adviser for Schlumberger oil field services company, described

7548-427: The British army and Royal Navy were committed to support France in the event of war with Germany but even in the British government, very few were aware of the extent of these commitments. In response to Germany's declaration of war on Russia, France issued a general mobilisation in expectation of war on 2 August and on 3 August, Germany also declared war on France. Germany's ultimatum to Belgium brought Britain into

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7696-498: The British debates on strategy for the Near East and Balkan theatre: The Russians viewed the Caucasus Front as secondary to the Eastern Front . They feared a campaign into the Caucasus aimed at retaking Kars which had been taken from the Ottoman Empire during the Russo-Turkish War (1877–1878) , and the port of Batum. In March 1915, when the Russian foreign minister Sergey Sazonov met with British ambassador George Buchanan and French ambassador Maurice Paléologue , he stated that

7844-446: The Caucasus Campaign. Addressing the head of the Armenian Church , and Alexander Khatisyan , president of the Armenian National Bureau in Tiflis , he said: Allies of World War I Associated allies and co-belligerents: The Allies , the Entente or the Triple Entente was an international military coalition of countries led by France , the United Kingdom , Russia , the United States , Italy , and Japan against

7992-440: The Caucasus to eastern Asia Minor , reaching as far as Trabzon, Bitlis, Mush and Van. The warfare on land was accompanied by actions undertaken by the Russian Navy in the Black Sea region of the Ottoman Empire. On 23 February 1917, the Russian advance was halted following the Russian Revolution , and later the disintegrated Russian Caucasus Army was replaced by the forces of the newly established Armenian state, which comprised

8140-530: The Caucasus. In 1916, an Arab Revolt began in the Hejaz . About 5,000 regular soldiers (mostly former prisoners of war of Arab origin) served with the forces of the revolt. There were also many irregular tribesmen under the direction of the Emir Feisal and British advisers. Of the advisers, T.E. Lawrence is the best known. France sent the French Armenian Legion to this theatre as part of its larger French Foreign Legion . Foreign Minister Aristide Briand needed to provide troops for French commitment made in

8288-806: The Dardanelles, and the Catalca. Ammunition was low; there were only about 588 shells available per gun. Additionally, the army estimated it needed several thousand more machine guns to fill its establishment; rifles were generally efficient at 1.5 million in stock, the army still needed another 200,000. In 1914, before the Empire entered the war, the four armies divided their forces into corps and divisions such that each division had three infantry regiments and an artillery regiment. The main units were: First Army with fifteen divisions; Second Army with 4 divisions plus an independent infantry division with three infantry regiments and an artillery brigade; Third Army with nine divisions, four independent infantry regiments and four independent cavalry regiments (tribal units); and

8436-510: The East via the Suez Canal . The Germans hoped to seize the Canal for the Central Powers, or at least to deny the Allies use of the vital shipping route. The British feared that the Ottomans might attack and capture the Middle East (and later Caspian) oil fields. The British Royal Navy depended upon oil from the petroleum deposits in southern Persia, to which the British-controlled Anglo-Persian Oil Company had exclusive access. Oxford historian (and Conservative MP) J.A.R. Marriott summarizes

8584-523: The East. The growth of the Russian railway network and increase in speed of mobilisation made rapid victory over France even more important; to accommodate the additional 170,000 troops approved by the 1913 Army Bill, the 'incursion' now became a full-scale invasion. The Germans accepted the risk of British intervention; in common with most of Europe, they expected it to be a short war while their London Ambassador claimed civil war in Ireland would prevent Britain from assisting its Entente partners. On 3 August,

8732-405: The Eastern Front. In the deployment, Enver sent the XV Army Corps to Galicia, the VI Army Corps to Romania, and the XX Army Corps and 177th Infantry Regiment to Macedonia in early 1916. The VI Corps took part in the collapse of the Romanian army in the Romanian Campaign , and were particularly valued for their ability to continue a high rate of advance in harsh winter conditions. The XV Corps

8880-556: The Entente in return for German territories in the Pacific, greatly annoying the Australian government which also wanted them. On 7 August 1914, Britain officially asked for assistance in destroying German naval units in China and Japan formally declared war on Germany on 23 August 1914, followed by Austria-Hungary on 25 August 1914. On 2 September 1914, Japanese forces surrounded the German Treaty Port of Qingdao , then known as Tsingtao, which surrendered on 7 November. The Imperial Japanese Navy simultaneously occupied German colonies in

9028-399: The French and German militaries accepted Germany would almost certainly violate Belgian neutrality in the event of war, the extent of that was unclear. The original Schlieffen Plan only required a limited incursion into the Belgian Ardennes , rather than a full-scale invasion; in September 1911, the Belgian Foreign Minister told a British Embassy official they would not call for assistance if

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9176-424: The French lost nearly 300,000 dead on the Western Front, more than Britain suffered in the whole of WWII and the gaps were partly filled by colonial troops, over 500,000 of whom served on the Western Front over the period 1914–1918. Colonial troops also fought at Gallipoli , occupied Togo and Kamerun in West Africa and had a minor role in the Middle East, where France was the traditional protector of Christians in

9324-404: The German Treaty Port of Tsingtao (now Qingdao) in China and occupied German colonies in the Pacific, including the Mariana , Caroline , and Marshall Islands . Despite its membership of the Triple Alliance , Italy remained neutral until 23 May 1915 when it joined the Entente, declaring war on Austria but not Germany. On 17 January 1916, Montenegro capitulated and left the Entente; this

9472-468: The German Caucasus Expedition whose prime aim was to secure oil supplies. On 3 March 1918, the conflict between the Ottoman Empire and Russia ended with the Treaty of Brest-Litovsk , and on 4 June 1918, the Ottoman Empire signed the Treaty of Batum with Armenia. However, the armed conflicts extended as the Ottoman Empire continued to engage with the Central Caspian Dictatorship, Republic of Mountainous Armenia, and British Empire forces from Dunsterforce until

9620-452: The Germans limited themselves to that. While neither Britain or France could allow Germany to occupy Belgium unopposed, a Belgian refusal to ask for help would complicate matters for the British Liberal government , which contained a significant isolationist element. However, the key German objective was to avoid war on two fronts; France had to be defeated before Russia could fully mobilise and give time for German forces to be transferred to

9768-419: The Italian Army , died on 1 July 1914, taking many of the prospects for Italian support with him. The Italian Prime Minister Antonio Salandra argued that as the Alliance was defensive in nature, Austria's aggression against Serbia and Italy's exclusion from the decision-making process meant it was not obliged to join them. His caution was understandable because France and Britain either supplied or controlled

9916-422: The Middle East. Australian troops separately occupied German New Guinea , with the South Africans doing the same in German South West Africa ; this resulted in the Maritz rebellion by former Boers, which was quickly suppressed. After the war, New Guinea and South-West Africa became Protectorates , held until 1975 and 1990 respectively. Between 1873 and 1887, Russia was allied with Germany and Austria-Hungary in

10064-406: The Muslim population of Northern Anatolia and Istanbul with more reliable Cossack settlers. The Armenian national liberation movement sought to establish an Armenian state within the Armenian Highlands . The Armenian Revolutionary Federation achieved this goal later in the war, with the establishment of the internationally recognized First Republic of Armenia in May 1918. As early as 1915,

10212-417: The Ottoman Empire in the Caucasus was the recovery of its territories that had been lost during the Russo-Turkish War (1877–1878) , in particular Artvin , Ardahan , Kars , and the port of Batum . Success in this region would force the Russians to divert troops from the Polish and Galician fronts . German advisors with the Ottoman armies supported the campaign for this reason. From an economic perspective,

10360-423: The Ottoman Empire, the centrepiece being the planned Berlin–Baghdad railway , with Serbia the only section not controlled by a pro-German state. The exact role played by Serbian officials in the assassination of Archduke Franz Ferdinand is still debated but despite complying with most of their demands, Austria-Hungary invaded on 28 July 1914. While Serbia successfully repulsed the Austro-Hungarian army in 1914, it

10508-400: The Ottoman Empire. The most notorious example being the Hamidiye , a mostly Kurdish elite cavalry division of the Ottoman army. The Hamidiye fought for the Ottomans in both the Caucucus and Persian campaigns and played a significant role in the Armenian genocide . Regions with high Armenian revolutionary actions were targets for the Hamidiye, who referred to an "Armenian Conspiracy" for killing

10656-636: The Ottoman provinces of Syria , Palestine and Lebanon . Prior to the Meiji Restoration in 1868, Japan was a semi-feudal, largely agrarian state with few natural resources and limited technology. By 1914, it had transformed itself into a modern industrial state, with a powerful military; by defeating China in the First Sino-Japanese War during 1894–1895, it established itself as the primary power in East Asia and colonised

10804-528: The Ottoman state. Kurdish Nationalists hoped that the Allies of World War I would aid them in creating an independent Kurdish nation if they were to fight against the Ottomans, and undertook several uprisings throughout the war . Most of these, except for the uprisings of August 1917, were not supported by any of the allied powers. Further still, many Kurds rejected remained loyal to and fought on behalf of

10952-609: The Ottoman, or rather German, strategic goal was to cut off Russian access to the hydrocarbon resources around the Caspian Sea . Germany established an Intelligence Bureau for the East on the eve of World War I. The bureau was involved in intelligence-gathering and subversive missions to Persia and Egypt, and to Afghanistan, to dismantle the Anglo-Russian Entente . Ottoman War Minister Enver Pasha claimed that if

11100-658: The Russians could be beaten in the key cities of Persia , it could open the way to Azerbaijan, as well as the rest of the Middle East and the Caucasus. If these nations were to be removed from Western influence, Enver envisioned a cooperation between these newly established Turkic states. Enver's project conflicted with European interests which played out as struggles between several key imperial powers . The Ottomans also threatened Britain's communications with India and

11248-517: The Triple Entente with France, which at this stage was largely informal. In 1908, Austria annexed the former Ottoman province of Bosnia and Herzegovina ; Russia responded by creating the Balkan League in order to prevent further Austrian expansion. In the 1912–1913 First Balkan War , Serbia , Bulgaria and Greece captured most of the remaining Ottoman possessions in Europe; disputes over

11396-410: The actual capacity. Laboratory testing can determine the characteristics of the reservoir fluids, particularly the expansion factor of the oil, or how much the oil expands when brought from the high pressure and high temperature of the reservoir to a "stock tank" at the surface. With such information, it is possible to estimate how many "stock tank" barrels of oil are located in the reservoir. Such oil

11544-696: The actual results of the 1919 Treaty of Versailles would be powerful factors in the rise of Benito Mussolini . In 1817, the Principality of Serbia became an autonomous province within the Ottoman Empire ; with Russian support, it gained full independence after the 1877–1878 Russo-Turkish War . Many Serbs viewed Russia as protector of the South Slavs in general but also specifically against Bulgaria, where Russian objectives increasingly collided with Bulgarian nationalism . When Austria annexed Bosnia and Herzegovina in 1908, Russia responded by creating

11692-449: The area. In addition to extraction equipment, there may be exploratory wells probing the edges to find more reservoir area, pipelines to transport the oil elsewhere, and support facilities. Oil fields can occur anywhere that the geology of the underlying rock allows, meaning that certain fields can be far away from civilization, including at sea. Creating an operation at an oil field can be a logistically complex undertaking, as it involves

11840-529: The army, only a few years before the First World War. From the outset, the Ottoman Army faced a host of problems in assembling itself. First of all, the size of the Ottoman Army was severely limited by division within the empire: non-Muslims were exempt from the military draft, and reliable ethnic Turks made up only 12 million of the empire's already relatively small population of 22 million, with

11988-699: The campaign against the British to capture the Suez Canal, and in Mesopotamia. Volunteers were considered unreliable by the organised army, due to a lack of training and a perception of mainly mercenary interests from the Arab and Bedouin volunteers. Heavy fighting also placed pressure on the Ottoman volunteer system. Before the war, Russia had the Russian Caucasus Army , but almost half of this

12136-719: The countries that fought for the Allies were also part of the Entente powers such as American Philippines , Belgian Congo , British India , French Algeria , and Japanese Korea . The United States joined near the end of the war in 1917 (the same year in which Russia withdrew from the conflict) as an "associated power" rather than an official ally. Other "associated members" included Serbia , Belgium , Montenegro , Asir , Nejd and Hasa , Portugal , Romania , Hejaz , Panama , Cuba , Greece , China , Siam , Brazil , Armenia , Luxembourg , Guatemala , Nicaragua , Costa Rica , Haiti , Liberia , and Honduras . The treaties signed at

12284-472: The defender of its fellow Slavs and on 30 July, mobilized in support of Serbia. In response, Germany declared war on Russia on 1 August, followed by Austria-Hungary on 6th; after Ottoman warships bombarded Odesa in late October, the Entente declared war on the Ottoman Empire in November 1914. French defeat in the 1870–1871 Franco-Prussian War led to the loss of the two provinces of Alsace-Lorraine and

12432-579: The division of these resulted in the Second Balkan War , in which Bulgaria was comprehensively defeated by its former allies. Russia's industrial base and railway network had significantly improved since 1905, although from a relatively low base; in 1913, Tsar Nicholas approved an increase in the Russian Army of over 500,000 men. Although there was no formal alliance between Russia and Serbia, their close bilateral links provided Russia with

12580-512: The empire. Additionally, several groups and individuals in the Ottoman society volunteered for active duty during the World War, the major examples being the " Mevlevi " and the "Kadiri". There were also units formed by Caucasian and Rumelian Turks, who took part in the battles in Mesopotamia and Palestine. Among Ottoman forces, volunteers were not only from Turkic groups; there were also smaller numbers of Arab and Bedouin volunteers who fought in

12728-517: The entire population. In 1830, the southern provinces of the Netherlands broke away to form the Kingdom of Belgium and their independence was confirmed by the 1839 Treaty of London . Article VII of the Treaty required Belgium to remain perpetually neutral and committed Austria, France, Germany and Russia to guarantee that against aggression by any other state, including the signatories. While

12876-430: The equipment associated with extraction and transportation, as well as infrastructure such as roads and housing for workers. This infrastructure has to be designed with the lifespan of the oil field in mind, as production can last many years. Several companies, such as Hill International , Bechtel , Esso , Weatherford International , Schlumberger , Baker Hughes and Halliburton , have organizations that specialize in

13024-718: The establishment of the League of Nations on 25 January 1919. This came into being on 16 January 1920 with Britain, France, Italy and Japan as permanent members of the Executive Council; the US Senate voted against ratification of the treaty on 19 March, thus preventing the United States from joining the League. For similar statistics of the Central Powers, see Central_Powers#Statistics . For much of

13172-639: The establishment of the Third Republic . The suppression of the Paris Commune by the new regime caused deep political divisions and led to a series of bitter political struggles, such as the Dreyfus affair . As a result, aggressive nationalism or Revanchism was one of the few areas to unite the French. The loss of Alsace-Lorraine deprived France of its natural defence line on the Rhine , while it

13320-594: The expansion of its railway network, particularly in border areas with Germany and Austria-Hungary. However, Russian defeat in the 1904–1905 Russo-Japanese War damaged its credibility, while Britain's isolation during the Second Boer War meant both countries sought additional allies. This resulted in the 1904 Entente Cordiale with Britain; like the 1907 Anglo-Russian Convention , for domestic British consumption it focused on settling colonial disputes but led to informal co-operation in other areas. By 1914, both

13468-402: The gas bubbles drive the oil to the surface. The bubbles then reach critical saturation and flow together as a single gas phase. Beyond this point and below this pressure, the gas phase flows out more rapidly than the oil because of its lowered viscosity. More free gas is produced, and eventually the energy source is depleted. In some cases depending on the geology the gas may migrate to the top of

13616-686: The genocide and undertook personal efforts to rescue Armenian civilians. The Caucasus Campaign comprised armed conflicts between the Ottoman Empire and the allies, the forces of the latter including Azerbaijan , Armenia , the Central Caspian Dictatorship, and the UK as part of the Middle Eastern theatre, or alternatively named, as part of the Caucasus Campaign during World War I. The Caucasus Campaign extended from

13764-684: The globe, on land and offshore. The largest are the Ghawar Field in Saudi Arabia and the Burgan Field in Kuwait , with more than 66 to 104 billion barrels (9.5×10 m ) estimated in each. In the modern age, the location of oil fields with proven oil reserves is a key underlying factor in many geopolitical conflicts. Natural gas originates by the same geological thermal cracking process that converts kerogen to petroleum. As

13912-631: The idea of an independent Albania , since this would prevent Serbian access to the Austrian-controlled Adriatic Sea . The success of the Albanian revolt in 1912 threatened Serbian ambitions for the incorporation of " Old Serbia " into its domain and exposed the weakness of the Ottoman Empire. This led to the outbreak of the First Balkan War , with Serbia , Montenegro , Bulgaria and Greece capturing most of

14060-566: The import of most of Italy's raw materials, including 90% of its coal. Salandra described the process of choosing a side as 'sacred egoism,' but as the war was expected to end before mid-1915 at the latest, making this decision became increasingly urgent. In line with Italy's obligations under the Triple Alliance, the bulk of the army was concentrated on Italy's border with France; in October, Pollio's replacement, General Luigi Cadorna ,

14208-514: The invading Russian troops in the east and by Greek troops and Armenian fedayis in the west, east, and south of Anatolia . The theatre covered the largest territory of all theatres in the war. Russian participation in the theatre ended as a result of the Armistice of Erzincan (5 December 1917), after which the revolutionary Russian government withdrew from the war under the terms of the Treaty of Brest-Litovsk (3 March 1918). The Armenians attended

14356-575: The large-scale construction of the infrastructure to support oil field exploitation. The term "oilfield" can be used as a shorthand to refer to the entire petroleum industry . However, it is more accurate to divide the oil industry into three sectors: upstream ( crude oil production from wells and separation of water from oil ), midstream (pipeline and tanker transport of crude oil) and downstream ( refining of crude oil to products, marketing of refined products, and transportation to oil stations). More than 65,000 oil fields are scattered around

14504-675: The largest component (after Britain herself) was the British Raj or British India, which included modern India , Pakistan , Myanmar and Bangladesh . Unlike other colonies which came under the Colonial Office , it was governed directly by the India Office or by princes loyal to the British; it also controlled British interests in the Persian Gulf , such as the Trucial States and Oman . Over one million soldiers of

14652-457: The last Christian inhabitants who still remained in the region In the early twentieth century, Kurds , much like Arabs, were a diverse population, dispersed across a wide area and far from homogeneous in social status or geo-political outlook. Though many were committed proponents of Kurdish nationalism, this view was far from ubiquitous. In 1914, many Kurds belonged to the Ottoman elite and Kurds often held high ranking and prominent offices within

14800-434: The liquid sections applying extra pressure. This is present in the reservoir if there is more gas than can be dissolved in the reservoir. The gas will often migrate to the crest of the structure. It is compressed on top of the oil reserve, as the oil is produced the cap helps to push the oil out. Over time the gas cap moves down and infiltrates the oil, and the well will produce more and more gas until it produces only gas. It

14948-438: The location of oil-water contact and with it the height of the oil bearing sands. Often coupled with seismic data, it is possible to estimate the volume of an oil-bearing reservoir. The next step is to use information from appraisal wells to estimate the porosity of the rock. The porosity of an oil field, or the percentage of the total volume that contains fluids rather than solid rock, is 20–35% or less. It can give information on

15096-545: The massive Erzerum Offensive that the Russian army had begun. The relocation of troops to the Eastern European Front was initiated by Enver. It was originally rejected by the German Chief of Staff, Erich von Falkenhayn , but his successor, Paul von Hindenburg , agreed to it, albeit with reservations. The decision was reached after the Brusilov Offensive , as the Central Powers were running short of men on

15244-403: The naturally occurring hydrocarbons, such as crude oil ( petroleum ) or natural gas , are trapped by overlying rock formations with lower permeability , while in unconventional reservoirs the rocks have high porosity and low permeability, which keeps the hydrocarbons trapped in place, therefore not requiring a cap rock . Reservoirs are found using hydrocarbon exploration methods. An oil field

15392-438: The oil and form a secondary gas cap. Some energy may be supplied by water, gas in water, or compressed rock. These are usually minor contributions with respect to hydrocarbon expansion. By properly managing the production rates, greater benefits can be had from solution-gas drives. Secondary recovery involves the injection of gas or water to maintain reservoir pressure. The gas/oil ratio and the oil production rate are stable until

15540-595: The other Central Powers ; and on the other side, the British (with the help of a small number of Jews , Greeks , Assyrians , some Kurdish tribes and Arab states, along with Hindu, Sikh and Muslim colonial troops from India ) as well as troops from the British Dominions of Australia, Canada, and New Zealand, the Russians (with the help of Armenians , Assyrians, and occasionally some Kurdish tribes), and

15688-533: The other 10 million being minorities of varying loyalty and military use. The empire was also very poor compared to the other powers in GDP, infrastructure, and industrial capacity. As a point of comparison the empire had only 5,759 km of railway, while France had 51,000 km of railway for a fifth of the land area. Ottoman coal production was negligible (826,000 tons in 1914 compared to 40,000,000 tons for France and 292,000,000 tons for Britain), while steel production

15836-724: The other hand, endured millions of years of sea level changes that successfully resulted in the formation of more than 150 oil fields. Although the process is generally the same, various environmental factors lead to the creation of a wide variety of reservoirs. Reservoirs exist anywhere from the land surface to 30,000 ft (9,000 m) below the surface and are a variety of shapes, sizes, and ages. In recent years, igneous reservoirs have become an important new field of oil exploration, especially in trachyte and basalt formations. These two types of reservoirs differ in oil content and physical properties like fracture connectivity, pore connectivity, and rock porosity . A trap forms when

15984-406: The placement of the well with respect to the gas cap. As with other drive mechanisms, water or gas injection can be used to maintain reservoir pressure. When a gas cap is coupled with water influx, the recovery mechanism can be highly efficient. Water (usually salty) may be present below the hydrocarbons. Water, as with all liquids, is compressible to a small degree. As the hydrocarbons are depleted,

16132-431: The preferential mechanism of leaking: the hydraulic seal and the membrane seal. A membrane seal will leak whenever the pressure differential across the seal exceeds the threshold displacement pressure, allowing fluids to migrate through the pore spaces in the seal. It will leak just enough to bring the pressure differential below that of the displacement pressure and will reseal. A hydraulic seal occurs in rocks that have

16280-429: The pressure. As the reservoir depletes, the pressure falls below the bubble point , and the gas comes out of solution to form a gas cap at the top. This gas cap pushes down on the liquid helping to maintain pressure. This occurs when the natural gas is in a cap below the oil. When the well is drilled the lowered pressure above means that the oil expands. As the pressure is reduced it reaches bubble point, and subsequently

16428-524: The previous Armenian volunteer units and the Armenian irregular units. During 1918 the region also saw the establishment of the Central Caspian Dictatorship, the Republic of Mountainous Armenia, and an Allied force named Dunsterforce which was composed of elite troops drawn from the Mesopotamian and Western Fronts. The Ottoman Empire and German Empire fought each other at Batumi after the arrival of

16576-485: The process as follows: Plankton and algae, proteins and the life that's floating in the sea, as it dies, falls to the bottom, and these organisms are going to be the source of our oil and gas. When they're buried with the accumulating sediment and reach an adequate temperature, something above 50 to 70 °C they start to cook. This transformation, this change, changes them into the liquid hydrocarbons that move and migrate, will become our oil and gas reservoir. In addition to

16724-588: The reassurance needed to take on Russia in the 1905 Russo-Japanese War ; victory established Japan in the Chinese province of Manchuria . With Japan as an ally in the Far East, John Fisher , First Sea Lord from 1904 to 1910, was able to refocus British naval resources in the North Sea to counter the threat from the Imperial German Navy . The Alliance was renewed in 1911; in 1914, Japan joined

16872-491: The reduction in pressure in the reservoir allows the water to expand slightly. Although this unit expansion is minute, if the aquifer is large enough this will translate into a large increase in volume, which will push up on the hydrocarbons, maintaining pressure. With a water-drive reservoir, the decline in reservoir pressure is very slight; in some cases, the reservoir pressure may remain unchanged. The gas/oil ratio also remains stable. The oil rate will remain fairly stable until

17020-668: The region. In reaction to the Assyrian Genocide and lured by British and Russian promises of an independent nation, the Assyrians led by Agha Petros of the Bit- Bazi , Malik Khoshaba of the Bit- Tiyari tribe and other tribal chiefs of Hakkari under the national leader Mar Shimun XXI Benyamin joined the Entente Powers and fought alongside the Allies against Ottoman forces, the Assyrians were known as

17168-448: The remaining Ottoman possessions in Europe. Disputes over the division of these resulted in the Second Balkan War , in which Bulgaria was comprehensively defeated by its former allies. As a result of the 1913 Treaty of Bucharest , Serbia increased its territory by 100% and its population by 64%. However, it now faced a hostile Austria-Hungary, a resentful Bulgaria and resistance in its conquered territories . Germany too had ambitions in

17316-408: The reservoir pressure drops below the bubble point when critical gas saturation is reached. When the gas is exhausted, the gas/oil ratio and the oil rate drops, the reservoir pressure has been reduced, and the reservoir energy is exhausted. In reservoirs already having a gas cap (the virgin pressure is already below bubble point), the gas cap expands with the depletion of the reservoir, pushing down on

17464-409: The reservoir, leading to an improved estimate of the recoverable resources. Reserves are only the part of those recoverable resources that will be developed through identified and approved development projects. Because the evaluation of reserves has a direct impact on the company or the asset value, it usually follows a strict set of rules or guidelines. To obtain the contents of the oil reservoir, it

17612-470: The rest serving in garrisons, coastal defenses, and in servicing lines of communication and transportation. Approximately 900 field guns were available for the mobile army, which was 280 below war establishment, though supplies of howitzers were generally sufficient. There were an additional 900 pieces of fixed or semifixed set-up in coastal and fortress garrisons across Adrianople, Erzurum, the Bosphorous,

17760-458: The risk was acceptable; they expected a short war while their ambassador in London claimed troubles in Ireland would prevent Britain from assisting France. On 3 August, Germany demanded unimpeded progress through any part of Belgium and when this was refused, invaded early on the morning of 4 August. This changed the situation; the invasion of Belgium consolidated political and public support for

17908-410: The rock fabric by strong capillary forces, requiring specialised measures for evaluation and extraction. Unconventional reservoirs form in completely different ways to conventional reservoirs, the main difference being that they do not have "traps". This type of reservoir can be driven in a unique way as well, as buoyancy might not be the driving force for oil and gas accumulation in such reservoirs. This

18056-410: The source, the "drier" the gas (that is, the smaller the proportion of condensates in the gas). Because both oil and natural gas are lighter than water, they tend to rise from their sources until they either seep to the surface or are trapped by a non-permeable stratigraphic trap. They can be extracted from the trap by drilling. The largest natural gas field is South Pars/Asalouyeh gas field, which

18204-553: The southern parts of Persia . These units had extensive experience in dealing with dissident tribal forces. The British later established the Mediterranean Expeditionary Force , British Dardanelles Army , Egyptian Expeditionary Force , and in 1917 they established Dunsterforce under Lionel Dunsterville , consisting of less than 1,000 Australian, British, Canadian and New Zealand troops accompanied by armoured cars, to oppose Ottoman and German forces in

18352-454: The structural trap, the stratigraphic trap, and the far less common hydrodynamic trap . The trapping mechanisms for many petroleum reservoirs have characteristics from several categories and can be known as a combination trap. Traps are described as structural traps (in deformed strata such as folds and faults) or stratigraphic traps (in areas where rock types change, such as unconformities, pinch-outs and reefs). Structural traps are formed as

18500-419: The success gained by the Russian forces, as they were natives of the region, adjusted to the climatic conditions, familiar with every road and mountain path, and had real incentives to fight. The Armenian volunteers were small, mobile, and well adapted to the semi- guerrilla warfare . They did good work as scouts, but also took part in numerous pitched battles. In December 1914, Nicholas II of Russia visited

18648-452: The surface. As the fluids are produced, the pressure will often decline, and production will falter. The reservoir may respond to the withdrawal of fluid in a way that tends to maintain the pressure. Artificial drive methods may be necessary. This mechanism (also known as depletion drive) depends on the associated gas of the oil. The virgin reservoir may be entirely semi-liquid but will be expected to have gaseous hydrocarbons in solution due to

18796-698: The then-unified Korea and Formosa, now modern Taiwan . Concerned by Russian expansion in Korea and Manchuria , Britain and Japan signed the Anglo-Japanese Alliance on 30 January 1902, agreeing if either were attacked by a third party, the other would remain neutral and if attacked by two or more opponents, the other would come to its aid. This meant Japan could rely on British support in a war with Russia, if either France or Germany, which also had interests in China, decided to join them. This gave Japan

18944-621: The two into direct conflict, as did the long-held Russian objective of gaining control of the Bosporus Straits and with it access to the British-dominated Mediterranean Sea . Defeat in the 1905 Russo-Japanese War and Britain's isolation during the 1899–1902 Second Boer War led both parties to seek allies. The Anglo-Russian Convention of 1907 settled disputes in Asia and allowed the establishment of

19092-556: The war by presenting what appeared to be a simple moral and strategic choice. The Belgians asked for assistance under the 1839 Treaty and in response, Britain declared war on Germany on 4 August 1914. Although Germany's violation of Belgium neutrality was not the only cause of British entry into the war, it was used extensively in government propaganda at home and abroad to make the case for British intervention. This confusion arguably persists today. The declaration of war automatically involved all dominions and colonies and protectorates of

19240-432: The war on 4 August, although France did not declare war on Austria-Hungary until 12 August. As with Britain, France's colonies also became part of the war; pre-1914, French soldiers and politicians advocated using French African recruits to help compensate for France's demographic weakness. But it eventually proved useless, the soldiers from Metropolitan France still undertook all the tasks. From August to December 1914,

19388-576: The war progressed, each coalition added new members. Japan joined the Entente in 1914 and, despite proclaiming its neutrality at the beginning of the war, Italy also joined the Entente in 1915. The term "Allies" became more widely used than "Entente" , although the United Kingdom, France, Russia, and Italy were also referred to as the Quadruple Entente and, together with Japan, as the Quintuple Entente . The colonies administered by

19536-648: The war, Russia established a volunteer system to be used in the Caucasus Campaign. In the summer of 1914, Armenian volunteer units led by Andranik Ozanian were established under the Russian Armed forces. As the Russian Armenian conscripts had already been sent to the European Front, this force was uniquely established from Armenians that were neither Russian subjects nor obliged to serve. The Armenian units were credited with no small measure of

19684-487: The war, to the extent that Boghos Nubar , in a public letter to the Paris Peace Conference in 1919, stated that they numbered 150,000. The Assyrian people of south east Anatolia, northern Mesopotamia and north western Persia also threw in their lot with the Russians and British, under the leadership of Agha Petros and Malik Khoshaba . In 1914, there were some British Indian Army units located in

19832-407: The water begins to be produced along with the oil, the recovery rate may become uneconomical owing to the higher lifting and water disposal costs. If the natural drives are insufficient, as they very often are, then the pressure can be artificially maintained by injecting water into the aquifer or gas into the gas cap. The force of gravity will cause the oil to move downward of the gas and upward of

19980-431: The water reaches the well. In time, the water cut will increase, and the well will be watered out. The water may be present in an aquifer (but rarely one replenished with surface water ). This water gradually replaces the volume of oil and gas that is produced out of the well, given that the production rate is equivalent to the aquifer activity. That is, the aquifer is being replenished from some natural water influx. If

20128-442: The water. If vertical permeability exists then recovery rates may be even better. These occur if the reservoir conditions allow the hydrocarbons to exist as a gas. Retrieval is a matter of gas expansion. Recovery from a closed reservoir (i.e., no water drive) is very good, especially if bottom hole pressure is reduced to a minimum (usually done with compressors at the wellhead). Any produced liquids are light-colored to colorless, with

20276-582: Was British support for France against Germany in the 1905 Moroccan Crisis . The 1905–1915 Liberal government continued this re-alignment with the 1907 Anglo-Russian Convention . Like the Anglo-Japanese and Entente agreements, it focused on settling colonial disputes but by doing so paved the way for wider co-operation and allowed Britain to refocus resources in response to German naval expansion . Since control of Belgium allowed an opponent to threaten invasion or blockade British trade, preventing it

20424-577: Was a long-standing British strategic interest. Under Article VII of the 1839 Treaty of London , Britain guaranteed Belgian neutrality against aggression by any other state, by force if required. Chancellor Theobald von Bethmann Hollweg later dismissed this as a 'scrap of paper,' but British law officers routinely confirmed it as a binding legal obligation and its importance was well understood by Germany. The 1911 Agadir Crisis led to secret discussions between France and Britain in case of war with Germany. These agreed that within two weeks of its outbreak,

20572-563: Was a surge of anti-Japanese nationalism in China and an economic boycott of Japanese goods. In addition, the other Allies now saw Japan as a threat, rather than a partner, lead to tensions first with Russia, then the US after it entered the war in April 1917. Despite protests from the other Allies, after the war Japan refused to return Qingdao and the province of Shandong to China. The 1882 Triple Alliance between Germany, Austria-Hungary and Italy

20720-488: Was borderline non-existent. There was only one cannon and small arms foundry in the empire, a single shell and bullet factory, and a single gunpowder factory, all of which were located in the Constantinople suburbs. The Ottoman economy was almost entirely agricultural, relying on products such as wool, cotton, and hides. During this period, the Empire divided its forces into armies. Each army headquarters consisted of

20868-486: Was established in the formerly Russian Transcaucasia around early 1918 during the Caucasus Campaign . Its prime aim was to secure oil supplies for Germany and stabilise a nascent pro-German Democratic Republic of Georgia . The new republic brought the Ottoman Empire and Germany into conflict, with exchanges of official condemnations between them in the final months of the war. The Ottoman Empire established

21016-462: Was exhausted by the two Balkan Wars and unable to replace its losses of men and equipment. In 1915, Bulgaria joined the Central Powers and by the end of the year, a combined Bulgar-Austrian-German army occupied most of Serbia. Between 1914 and 1918, Serbia suffered the greatest proportional losses of any combatant, with over 25% of all those mobilised becoming casualties; including civilians and deaths from disease, over 1.2 million died, nearly 30% of

21164-736: Was known to fight very well against the Russians in Galicia, often inflicting on the Russians several times the casualties they took. After the Young Turk Revolution and the establishment of the Second Constitutional Era ( Turkish : İkinci Meşrûtiyet Devri ) on 3 July 1908, a major military reform started. Army headquarters were modernised. The Ottoman Empire was engaged in the Turco-Italian War and Balkan Wars , which forced more restructuring of

21312-464: Was offset when Germany declared war on Portugal in March 1916, while Romania commenced hostilities against Austria on 27 August. On 6 April 1917, the United States entered the war as a co-belligerent, along with the associated allies of Liberia , Siam and Greece . After the 1917 October Revolution , Russia left the Entente and agreed to a separate peace with the Central Powers with the signing of

21460-532: Was ordered to begin moving these troops to the North-Eastern one with Austria. Under the April 1915 Treaty of London , Italy agreed to join the Entente in return for Italian-populated territories of Austria-Hungary and other concessions; in return, it declared war on Austria-Hungary in May 1915 as required, although not on Germany until 1916. Italian resentment at the difference between the promises of 1915 and

21608-548: Was redeployed to the Prussian front after the defeats at the battles of Tannenberg and the Masurian Lakes , leaving behind just 60,000 troops in this theatre. In the summer of 1914, Armenian volunteer units were established under the Russian Armed forces. Nearly 20,000 Armenian volunteers expressed their readiness to take up arms against the Ottoman Empire as early as 1914. These volunteer units increased in size during

21756-426: Was renewed at regular intervals, but was compromised by conflicting objectives between Italy and Austria in the Adriatic and Aegean seas. Italian nationalists referred to Austrian-held Istria (including Trieste and Fiume ) and Trento as 'the lost territories' , making the Alliance so controversial that the terms were kept secret until it expired in 1915. Alberto Pollio , the pro-Austrian Chief of Staff of

21904-424: Was weaker demographically than Germany, whose 1911 population was 64.9 million to 39.6 in France, which had the lowest birthrate in Europe. This meant that despite their very different political systems, when Germany allowed the Reinsurance Treaty to lapse, France seized the opportunity to agree the 1894 Franco-Russian Alliance . It also replaced Germany as the primary source of financing for Russian industry and

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