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Geochemical evidence for petroleum potential of Domanic deposits in the Republic of Tatarstan (Russian)
Khisamov, R. S. (Tatneft PJSC, RF, Almetyevsk) | Bazarevskaya, V. G. (TatNIPIneft, RF, Bugulma) | Tarasova, T. I. (TatNIPIneft, RF, Bugulma) | Mikhailova, O. V. (TatNIPIneft, RF, Bugulma) | Mikhailov, S. N. (TatNIPIneft, RF, Bugulma)
The pdf file of this paper is in Russian. Detailed survey of Domanic formations in Tatarstan has been under way since 2012. To date, sufficient amount of data has been obtained and analyzed. The analysis shows that Domanic formations in Tatarstan are presented by domanikites occupying a large starved basin of the Sargaev-Domanik-Mendymskian age and having TOC of 5 – 20 %, and domanikoids being analogous to Upper Frasnian-Tournaisian shallow-water bioherm-carbonate deposits and having TOC of 0.5 – 5 %. These deposits occupy the central areas of the Kama-Kinel system of starved downwarps and the total territory of Tatarstan. According to data analysis, domanikites are presented by nonuniform interbedding of carbonate-silica rocks with limestones and dolomites. Organic matter varies from very low to high concentrations. But, regardless of high variation range, the majority of the core samples (55 %) have organic matter content over 4 %. Whatever organic matter content is, domanikites exhibit HI from 300 to 600 mg HC/g, which is typical of oil generating kerogen, type 2 (sapropelic). Generally, rock maturity is rather low; according to pyrolysis data, Tmax value averages to 425 °C, corresponding to protocatagenesis termination zone. Hence, domanikites are at the beginning of the main oil generation phase. However, deposits maturity within the South-Tatar uplift is higher compared to the Melekessk depression, which can obviously be attributed to specific geothermal conditions in this area, as well as to formation of deposits with high sulphur content, which affected rock maturity distribution and the type of kerogen capable of generating early pre-main-phase oils. These oils contain heavy components (resins and asphaltenes) and sulphur. Analysis of Tatarstan oil composition and density supports this idea. Domanikoids are presented by carbonates with varying content of organic matter which, in general, is rather low. As compared to domanikites, domanikoids have higher content of humus substance. Rock maturity is low; according to pyrolysis data, Tmax averages to 424 °C, which corresponds to protocatagenesis zone. Productivity index (PI) conforms to Tmax values and corresponds to protocatagenesis zone, as well. So, both domanikites and domanikoids exhibit good hydrocarbon potential, being at the end of protocatagenesis and at the start of mezocatagenesis processes throughout the entire territory under consideration. However, considering the potential for early pre-main-phase oil generation and presence of confirmed oil accumulations in Domanic facies associated with natural fracture zones, we can conclude that these deposits show good promise for discovering new unconventional oil reservoirs. To produce oil from such reservoirs, optimization of thermal recovery processes, as well as acid and multi-stage fracturing methods is required.
- Geology > Geological Subdiscipline > Geochemistry (1.00)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.90)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.54)
Structure and perspectives of oil and gas potential of Fransian-Tournaisian domanicoid organic-rich formation in the central part of the Volga-Ural basin (Russian)
Karpushin, M. Yu. (Lomonosov Moscow State University) | Stupakova, A. V. (Lomonosov Moscow State University) | Zavyalova, A. P. (Lomonosov Moscow State University) | Kalmykov, G. A. (Lomonosov Moscow State University) | Chupakhina, V. V. (Lomonosov Moscow State University) | Korobova, N. I. (Lomonosov Moscow State University) | Suslova, A. A. (Lomonosov Moscow State University) | Radchenko, K. A. (Lomonosov Moscow State University)
In recent years, industrial accumulations of hydrocarbons in the domanicoid deposits of the Volga-Ural oil and gas basin have been identified on the territory of the Samara and Orenburg regions. This article discusses the prospects for the search for hydrocarbons in domanicoid deposits on the territory of the Republic of Bashkortostan. One of the main tasks is to determine intervals with capacitive properties and a total thickness sufficient for the forming industrial accumulations of oil and gas. To identify such intervals, the section of the domanicoid organic-rich formation was divided into rock units. Their porosity and permeability properties were studied, and the most favorable types of section for reservoir maintenance were determined by the nature of the interbedding of rock units. Three types of rock units are identified: carbonate-siliceous rocks with a high content of organic matter; frequent interbedding of carbonate-siliceous and siliceous-carbonate rocks; predominantly carbonate rocks. Each individual unit contains reservoir rocks with fractured-porous and porous-fissured void space. Members compose cyclites of different scales, correlate with each other and meet certain conditions of sedimentation. The set of units determines the type of section. Three types of sections are distinguished in domanicoid deposits, corresponding to different paleostructural zones of their accumulation: the intrashelf basin, the slope of the intrashelf basin, and the shelf of the carbonate platform. The analysis of the capacitive properties of the rocks of each unit made it possible to proceed to the prediction of the quality of the reservoir properties based on the data of geophysical well surveys. The nuclear magnetic log data formed the basis of the dependences of porosity values on the neutron log values. The results of the study showed that the second unit type, represented by the interbedding strata of siliceous-carbonate and carbonate-siliceous rocks, contain the largest number of capacious and high-capacity reservoir rocks, the distribution area of which within the domanicoid organic-rich formation is associated with the Frasnian-Famennian section of intrashelf basins. A relatively high flow rate was also recorded from the unit of the second type, which allows us to conclude that the units of this type are the most promising. On the basis of these studies, a general map of forecast zones of development of capacious and high-capacity reservoir rocks within the organic-rich domanikoid formation in the territory of the Republic of Bashkortostan was built.
- Europe > Russia > Volga Federal District > Republic of Bashkortostan (0.95)
- Europe > Russia > Volga Federal District > Orenburg Oblast > Orenburg (0.24)
- Phanerozoic > Paleozoic > Devonian > Upper Devonian (0.68)
- Phanerozoic > Paleozoic > Carboniferous > Mississippian > Lower Mississippian > Tournaisian (0.41)
- North America > United States > West Virginia > Appalachian Basin > Upper Devonian Shale Basin > Upper Devonian Shale Formation (0.97)
- North America > United States > Pennsylvania > Appalachian Basin > Upper Devonian Shale Basin > Upper Devonian Shale Formation (0.97)
- North America > United States > Ohio > Appalachian Basin > Upper Devonian Shale Basin > Upper Devonian Shale Formation (0.97)
- (3 more...)
Geochemical criteria for characterization of the Devonian and Carboniferous organic-rich formations of Bashkortostan and their petroleum generation potential (Russian)
Masagutov, R. Kh. (Bashneft PJSOC, RF, Ufa) | Ilemenova, O. D. (BashNIPIneft LLC, RF, Ufa) | Minkaev, V. N. (Bashneft PJSOC, RF, Ufa)
The PDF file of this paper is in Russian. The paper reviews the composition, specific features, lateral and vertical distribution of the Devonian and Carboniferous organic-rich formations. The study is aimed at the detailed understanding of the organic-rich sediments and their role as a source for petroleum generation in Bashkortostan. The organic-rich sediments typical of the Domanic formation are widespread throughout the territory of the Cis-Ural Bashkiria whereas those of the Upper Frasnian, Famenian and Tournaisian are confined only to structural lows – the axial parts of the Shalym, Aktanysh-Chishmy and Inzer-Usolsk paleo depressions of the Kama-Kinel System of Troughs. The results of pyrolysis (Rock-Eval) on samples from the Domanikian Formation, as well as the domanicoid sediments from the Tournaisian and Famenian sequences are compared and analyzed. The samples from the Domanic formation are characterized by significantly higher TOC values as compared to the Tournaisian and Famenian samples. The obtained results of pyrolysis and measured vitrinite reflectance indicate highest level of thermal maturity of the organic matter in the Domanic formation which corresponds to MК1-MК2 stages of catagenesis (mesocatagenesis) or the main oil window. The organic matter of the Tournaisian-Famenian sediments is characterized by relatively low thermal maturity. This observation is based on the value of vitrinite reflectance which indicates the ПК3–MК1 early stages of catagenesis (proto- and mesocatagenesis), also supported by the Pyrolytic Oil-Productivity Index values and Tmax. The difference in the level of maturity of the organic matter in the Domanic formation as compared to the Tournaisian and Famenian is explained by the difference in the initial composition of the deposited organic matter, tectonic evolution and burial history. The results of gas-liquid chromatography and chromate-mass-spectrometry are used for comparative characterization of bitumen from the Domanic formation and organic-rich formations of the Famenian to liquid hydrocarbons discovered in the Paleozoic reservoirs of Bashkortostan. The parameters of various groups of normal alkanes and isoprenoids in the analyzed samples of the Paleozoic oils and bitumen from the Domanic Formation may be easily correlated whereas the bitumen from the Famenian is quite different based on the geochemical criteria. The findings support the genetic origin of the bitumen of the Domanic Formation and petroleum found in the Devonian and Carboniferous plays of the Cis-Ural Bashkortostan. The organic-rich formations of the Upper Frasnian, Famenian and Tournaisian may also be regarded as an additional source of hydrocarbons.
- Phanerozoic > Paleozoic > Carboniferous > Mississippian > Lower Mississippian > Tournaisian (1.00)
- Phanerozoic > Paleozoic > Devonian > Upper Devonian > Frasnian (0.95)
- Geology > Rock Type > Sedimentary Rock > Organic-Rich Rock > Coal (1.00)
- Geology > Geological Subdiscipline > Geochemistry (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)
- Reservoir Description and Dynamics > Fluid Characterization > Geochemical characterization (1.00)
Hydrocarbon potential of Domanic pay zones of Volga-Ural oil-and-gas basin (Russian)
Khisamov, R. S. (Tatneft PJSC, RF, Almetyevsk) | Bazarevskaya, V. G. (TatNIPIneft, RF, Bugulma) | Tarasova, T. I. (TatNIPIneft, RF, Bugulma) | Badurtdinova, N. A. (TatNIPIneft, RF, Bugulma) | Gibadullina, O. G. (TatNIPIneft, RF, Bugulma)
The PDF file of this paper is in Russian. The Domanic pay zones can be compared with the shale plays in the USA. In the geologic section of the Volga-Ural oil-and-gas basin, they occur from the Sargaevskian through the Zavolzhskian age. The Domanic sediments are represented by siliceousargillaceous-carbonate varieties enriched with organic matter and other dissipated oil components. These sediments with rather low-quality reservoir properties are the main source rock. The Domanic sediments on the territory of the Republic of Tatarstan and the adjoining territories of the Volga-Ural oil-and-gas province were proved to be oil-bearing. To-date (as of January 1, 2017), eight fields with pay zones confined to the Domanic sediments have been booked in the State Reserves Register of the Republic of Tatarstan. All these fields are found within the South-Tatarian Arch. Oil accumulations were found in the Domanic sediments of the Sargaevskian, Eletskian, Dankovo-Lebedyanskian, and Zavolzhskian formations. Tatneft PJSC has been carrying out Domanic exploration projects in its license areas in the Republic of Tatarstan, Samara and Orenburg regions, the Nenets Autonomous Area, and the Republic of Kalmykia. In Samara and Orenburg regions, oil accumulations in the Zavolzhskian and Dankovo-Lebedyanskian formations were found, also, core analyses revealed slight oil shows in the Dankovo-Lebedyanskian, Eletskian, Zadonskian, Evlanovskian-Livenskian, Voronezhskian, Mendymskian, Semilukskian, and Sargaevskian formations. However, conventional flow tests in the intervals of the Dankovo-Lebedyanskian, Eletskian Evlanovskian-Livenskian, and Voronezhskian formations produced water. Obviously, non-conventional novel approaches are needed to drill and test Domanic sediments, which can be rather costly. High exploration potential is associated with the Republic of Udmurtia. At present, six fields with pay zones confined to the Domanic sediments in the Frasnian, Famennian, and Zavolzhskian formations have been booked in the State Reserves Register of the Republic of Udmurtia; besides, oil accumulations not yet booked have been found in the Zavolzhskian formations. In Udmurtia, conventional exploration methods were applied implying search for oil in the Domanic plays based on presence of bioherm buildups. However, our experience shows that the Domanic sediments are characterized by areal extent and are not controlled by structural factors. It should also be borne in mind that the Domanic pay zones are classified as nonconventional tight reservoirs with rather high TOC. Available data is not yet sufficient to assess hydrocarbon potential in the Republic of Udmurtia, however, consistent and detailed study of Domanic plays might make them a promising production target. Generally, hydrocarbon potential of the Domanic sediments is rather high, and the territory of the Volga-Ural oil-and-gas province may serve as a unique testing site to study Domanic plays and to test novel production methods that are able to provide return on investments.
- Europe > Russia > Volga Federal District > Udmurtia (1.00)
- Europe > Russia > Volga Federal District > Republic of Tatarstan (1.00)
- Europe > Russia > Volga Federal District > Orenburg Oblast > Orenburg (0.45)
Evaluation of Domanic formation unconventional resources in LUKOIL PJSC (Russian)
Gabnasyrov, A. V. (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm) | Lyadova, N. A. (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm) | Putilov, I. S. (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm) | Solovjev, S. I. (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm)
The pdf file of this paper is in Russian. Main purpose of this paper was to evaluate unconventional resources of Domanic shales within Volga-Ural and Timan-Pechora basins. Unconventional resources of Domanic formation are studied very poorly. Well known, shale plays have very complicated geology. Because of that we generalized previous geological reports, revised all existed standard, special and geochemical (including Rock Eval) core studies and well logging. Those studies results were analized. Core-Core and Core-Log plots were made. All the materials mentioned above were used for generation of maps of unconventional exploration features (such as organic matter maturity, lithology variation, total organic carbon content etc.). Parameters of Domanik shales were compared with parameters of unconventional plays of United States and Canada. Geology of Domanic shales was specified. Criteria of ‘sweet spots’ in Domanic formation were determined. Territories for further exploration works were localized. After generalization of all geological materials, such as well logging and core analysis, mentioned data were comparing with some shale projects in USA. Based upon all new information and criteria (new relative to traditional traps) a new program for further exploration of unconventional resources in Domanic shale has been developed.
- North America > United States (0.87)
- Europe > Russia > Northwestern Federal District > Nenets Autonomous Okrug (0.54)
- Europe > Russia > Northwestern Federal District > Komi Republic (0.54)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (1.00)
- Geology > Geological Subdiscipline > Geochemistry (1.00)
- Geology > Petroleum Play Type > Unconventional Play > Shale Play (0.49)
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Maverick Basin > Eagle Ford Shale Formation (0.99)
- (2 more...)