Tag Archives: deposit
This research is relevant as the development of world energy over the past decades is characterized by increased production and consumption of natural gas. One of the leading gas producing countries is Russia, which accounts for more than 25% of the world’s total gas production. In the Energy Program of the Russian Federation, by 2020, the planned volume of gas production will be 700 billion m3. The development strategy of the gas industry provides for the extraction of residual geological reserves. All these aspects are pushed to create new and effective technologies for gas preparation, as well as modernization of existing technological processes and equipment for gas preparation.
Every year, the role of gas in the global fuel and energy balance is becoming increasingly important. Thus, in 2002, global production amounted to approximately 2.800 billion m3. Of these, only 522 billion cubic meters of gas were produced by Russia’s Gazprom. The growth of gas production in Russia by 2005 was about 5%.
The state of the oil and gas industry is characterized by low automation, the use of obsolete and worn-out equipment, a decrease in gas production in exploited deposits, an ever-increasing remoteness of developing deposits, and so on. In conditions of increased competition from foreign producers, modernization of gas engineering and increasing the efficiency of gas production are vital for ensuring energy security and stable economic development of the country.
The article discusses the problem of exploitation of gas fields, at a late stage of development. The operation is complicated, because of the accumulation of condensation and formation water, a limited number of technological processes are used, as a result of which the productivity of the wells decreases or irreversible gas losses occur during process blowdowns.
OIL AND GAS FIELDS IN ZHUNGEER BASIN AND THE PROBLEMS OF THEIR EXPLORATION IN THE NORTHWEST OF CHINA
Zhungeer Basin is located in the province of Xinjiang in northwest China. It has an area of 130 km2. In tectonic terms, this trap is immersed in south-eastern direction. Zhungeer Basin is made by continental deposits from the Permian to Miocene age with a total capacity of 14 thousand meters Permian source rocks, represented by high carbon clay deposits, developed in the southern part of the basin. Oil has migrated over the surfaces of disagreements and accumulated in the lenses of sandstones and conglomerates in the sediments of the Carboniferous, Upper Permian, Middle and Upper Triassic, Upper Jurassic and Miocene (C, P2, T2-3, J3, N1).
Within the Zhungeer Basin yet are identified 5 oil-bearing formations, which are dispersed in the Carboniferous and Permian sediments. Most common oil-bearing interval reaches 800-900 m. In 2008 was completed a drilling with a depth of 2010 m. When testing two-meter reservoir sandstones of Carboniferous age in the range of 605-698 m, we obtained 527 tons of oil and 1,200 m3 of gas on the nozzle 5 mm. In addition, high viscous oil also was discovered.
This paper discusses the geological and production characteristics of the main oil and gas fields of the Zhungeer basin. It was Investigated in detail the structural features, the history of the discovery and formation of hydrocarbons, dissemination and preservation of oil and gas deposits. To establish geological structures and Mesozoic thickness, which is possibly promising for oil and gas, research of the university within the state scientific and technical program “Sustainable development of natural resources and modernization of oil and gas technologies” (from 2012) and program of the China University of Petroleum “Energy program and the development of China” (from 2010) is in process.
The exploration maturity of the Republic of Bashkortostan in terms of the remaining petroleum potential is characterized among other features by the fact that the undiscovered oil and gas resources are confined to small traps with complex architecture.
Quite high hydrocarbon exploration potential of the Devonian sandstones as well as younger reservoirs is still related to the known extensive faulted zones. The paper focuses on one of such zones namely the Volkov-Gurov Horst System (VGHS).
The available geological and geophysical data suggest that this structural tectonic zone has additional potential for new oil discoveries. Fairly promising are not only the up thrown blocks of the VGHS which are characterized by very uneven drilling density, but also a deeper trend of anticlines along the downthrown wall of the fault to the South-East of it. Evidence thereof is provided by the geological setting of the two oil discoveries made in the Devonian sandstones allied to the VGHS play fairway.
The first discovery was made in the sandstones of Pashiy DI Fm. in the NE part of the study area within the Volkov-Gurov Horst System. Drilling data indicates that the top of the productive sandstone reservoir in well 37POD lies at -1951 m TVDss 52 m deeper than in well 231AMT (-1899 m) drilled in the up thrown horst block, the formation was water-bearing in that well. The fact that no oil was found in the shallow part of the reservoir may imply a 3-way dip closure sealed to a fault or impermeable tectonic barrier.
The second discovery is considerably to the SW on the Baskakov area of Novo-Uzhybashevskoe field. Well 7UZB penetrated top of Kynov Fm. at the shallowest depth of –1885 m, i.e. 7 and 13 m above the same formation penetrated in wells 475 (-1892 m) and 25UZB (-1898 m) accordingly which found oil.
The above mentioned arguments and the potential traps identified on the 2D seismic sections contribute to the additional exploration potential and commercial reserves of oil yet to be found in the sandstones of Kynov Dkn, Pashiy DI and Mullin DII formations not only on the up thrown fault blocks of the VGHS but also anticlines along the downthrown SE wall of the reverse fault bounding the graben in deeper-seated reservoirs.
Petro-geochemical features and geodynamics setting of magmatic rocks of Amursky stratabound deposit (South Urals)
Geological and geodynamics setting and geochemical composition of volcanic-sedimentary layer of Amursky stratabound zinc deposit are considered in the article. It is shown, that volcanic and intrusive rocks are comagmatic. Basalts and diabases are similar to volcanic rocks of berezovsky layer (C1t-v1), and gabbro is similar to gabbro-granitic complex of Magnitogorskian megazone, formed in continental rift setting.
The complex analysis of seismic data, core analysis, wireline logs information and well tests results has been made for identification of fracture zones within reservoir. Reservoir model has been justified and it allows to increase efficiency of development.