The Volga-Ural Petroleum and Gas Province, also known as the Volga-Ural Petroleum and Gas Basin, is a geographical region in southern

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

. Stretching from the west bank of the

Volga The Volga (; russian: Во́лга, a=Ru-Волга.ogg, p=ˈvoɫɡə) is the List of rivers of Europe#Rivers of Europe by length, longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Cas ...

to the western

Ural Mountains The Ural Mountains ( ; rus, Ура́льские го́ры, r=Uralskiye gory, p=ʊˈralʲskʲɪjə ˈɡorɨ; ba, Урал тауҙары) or simply the Urals, are a mountain range that runs approximately from north to south through western ...

, the province contains sizeable quantities of

oil An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) & lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturated ...

and

natural gas Natural gas (also called fossil gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Low levels of trace gases like carbo ...

. In parts the Volga-Ural Petroleum and Gas Province coincides with the Middle-Urals Ring Structure.

Description

The province is a large geographical region in Russia. The province is found in roughly the same area as another geographic feature, the Volga-Uralic region, a broad

anticline In structural geology, an anticline is a type of fold that is an arch-like shape and has its oldest beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex up in which the hinge or crest is the ...

formed between western bank of the

Volga river The Volga (; russian: Во́лга, a=Ru-Волга.ogg, p=ˈvoɫɡə) is the List of rivers of Europe#Rivers of Europe by length, longest river in Europe. Situated in Russia, it flows through Central Russia to Southern Russia and into the Cas ...

and the western slopes of the

Ural mountains The Ural Mountains ( ; rus, Ура́льские го́ры, r=Uralskiye gory, p=ʊˈralʲskʲɪjə ˈɡorɨ; ba, Урал тауҙары) or simply the Urals, are a mountain range that runs approximately from north to south through western ...

. The region is further divided into three sub-regions; the Perm-Bashkir arch forms the northern border of the region, the Zhigulevsko-Orenburg arch forms the southern border, with the Tartar arch separating the two. Between all of the major arches are a series of depressions (downwarps) in the earth. In addition, the region's mineral makeup has allowed for a series of seven large

aquifers An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characterist ...

to form - the largest concertation of water is found in the eastern part of the province where the underwater channels meet the western slopes of the Ural mountains. The region's primary drainage basin is near the north coast of the

Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia ...

. The Volga-Ural province is formed by a variety of different geological layers. The bottom of the province is made up of crystalline earth formed during the

Archean Eon The Archean Eon ( , also spelled Archaean or Archæan) is the second of four geologic eons of Earth's history, representing the time from . The Archean was preceded by the Hadean Eon and followed by the Proterozoic. The Earth during the Archea ...

(4.0 to 2.5

Gya A billion years or giga-annum (109 years) is a unit of time on the petasecond scale, more precisely equal to seconds (or simply 1,000,000,000 years). It is sometimes abbreviated Gy, Ga ("giga-annum"), Byr and variants. The abbreviations Gya or ...

). On top of this layer are younger layers consisting of various materials, including

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especial ...

, organic forms of

carbonate A carbonate is a salt of carbonic acid (H2CO3), characterized by the presence of the carbonate ion, a polyatomic ion with the formula . The word ''carbonate'' may also refer to a carbonate ester, an organic compound containing the carbonate g ...

, and other conglomerated mineral beds. Many of the upper layers of the region are composed of marine-based materials formed by the extinction of the ancient

Ural Ocean The Ural Ocean (also called the Uralic Ocean) was a small, ancient ocean that was situated between Siberia and Baltica. The ocean formed in the Late Ordovician epoch, when large islands from Siberia collided with Baltica, which was then part of ...

and Permian Sea. Notably, the varied remnants of seas from the

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...

and

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

periods - found in other parts of Russia - are not widely present in the region. The geological history and mineral makeup of the province made it conducive to the formation of oil and natural gas, and the region currently contains large quantities of these

fossil fuels A fossil fuel is a hydrocarbon-containing material formed naturally in the Earth's crust from the remains of dead plants and animals that is extracted and burned as a fuel. The main fossil fuels are coal, oil, and natural gas. Fossil fuels ...

. These reserves make the economic exploitation of the region viable; according to one source, as of 1983 there were around 600 oil and gas fields in the region with another 2000 smaller pools. The province saw limited interest until the 1940s, when the outbreak of

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

saw a larger amount of investment in the region. Economic investment in the province's extraction industries greatly increased in the 1950s, were reduced in the 1980s, and continue into the present day. Notable oil fields in the region include Romashkino Oil Field. The cities of

Syzran Syzran ( rus, Сызрань, p=ˈsɨzrənʲ) is the third largest city in Samara Oblast, Russia, located on the right bank of Saratov Reservoir of the Volga River. Population: History Founded in 1683 as a fortress, Syzran grew into an important ...

Perm Perm or PERM may refer to: Places *Perm, Russia, a city in Russia ** Permsky District, the district **Perm Krai, a federal subject of Russia since 2005 **Perm Oblast, a former federal subject of Russia 1938–2005 **Perm Governorate, an administra ...

Ufa Ufa ( ba, Өфө , Öfö; russian: Уфа́, r=Ufá, p=ʊˈfa) is the largest city and capital of Bashkortostan, Russia. The city lies at the confluence of the Belaya and Ufa rivers, in the centre-north of Bashkortostan, on hills forming the ...

, Kuybyshev, and

Orenburg Orenburg (russian: Оренбу́рг, ), formerly known as Chkalov (1938–1957), is the administrative center of Orenburg Oblast, Russia. It lies on the Ural River, southeast of Moscow. Orenburg is also very close to the Kazakhstan-Russia bor ...

all lay within the borders of the province. A series of pipelines transport oil extracted from the region to various destinations in Russia.

References

{{coord missing, Tatarstan Oil fields of Russia Geography of Russia