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Examples of reconstruction of productive strata depositional environment in Azerbaijan on the base of well logging data

UDK: 622.323
DOI: 10.24887/0028-2448-2019-5-62-66
Key words: facies, South Caspian basin, productive strata, basin, log, terrigenous formation
Authors: V.M. Seidov (Azerbaijan State University of Oil and Industry, Azerbaijan, Baku), L.N. Khalilova (Azerbaijan State University of Oil and Industry, Azerbaijan, Baku)

In the first half of the Pliocene epoch, the productive stratum sedimentation proceeded at the expense of feeding areas rich with quartz component. These areas were located to the north of the Khachmaz relic. They represented both lowlands, and plateaus and uplands, formed as a result of tectonic movements that took place until the end of Pontic time. It should be noted that the development of the basin was due not only to deflection of the bottom, but also to the confluence of large rivers, whose regime was mainly controlled by climatic factors. The latter influenced the change in the amount of water in the rivers and the rate of their flow. The main drainage arteries at this time were: Paleo-Kura, Paleo-Volga, Paleo-Uzboi, as well as Paleo-Araz, Paleo-Pirsagat, Paleo-Ural, Paleo-Emba, Paleo-Sulik, Paleo-Terek and others. According to the principle of the upper asymmetry, seven large rhythms were singled out in the section of the PS of the productive stratum of the Apsheron peninsula. The boundaries between these rhythms correspond to the interruptions in the sedimentation, and in the sole of each rhythm traces of erosion of the regressive part of the previous rhythm. Facies interpretation of well logging data allows to establish the peculiarities of sedimentation conditions on local sites of separate regions that differ from each other in the genesis of precipitation. It is known that the basin in the Pliocene age of the productive stratum throughout the entire time of existence was distinguished by a complex coastal relief influenced by delta systems (including underwater parts) of rivers. All this makes it difficult to reconstruct the sedimentation environments in some areas, despite the fact that the general regularities of the sedimentation of the Pliocene sediments have been identified and studied for the basin of the South Caspian basin.

References

1. Kocharli Sh.S., Problemnye voprosy neftegazovoy geologii Azerbaydzhana (Problem issues of oil and gas geology of Azerbaijan), Baku, 2015, 278 p.

2. Abasov M.T., Kondrushkin Yu.M., Aliyarov R.Yu. et al., Izuchenie i prognozirovanie parametrov slozhnykh prirodnykh rezervuarov nefti i gaza Yuzhno-Kaspiyskoy vpadiny (Study and prediction of parameters of complex natural oil and gas reservoirs of the South Caspian Depression), Baku, 2007, 217 p.

3. Mamedov P.Z., Seysmostratigraficheskie issledovaniya geologicheskogo stroeniya osadochnogo chekhla Yuzhno-Kaspiyskoy megavpadiny v svyazi s perspektivami neftegazonosnosti (Seismostratigraphic studies of the geological structure of the sedimentary cover of the South Caspian megabasin in connection with the prospects of oil and gas potential): thesis of doctor of geological and mineralogical science, Baku, 1992.

4. Muromtsev V.S., Elektricheskaya geologiya peschanykh tel – litologicheskikh lovushek nefti i gaza (Electrical geology of sandy bodies-lithological traps of oil and gas), Moscow: Nedra Publ., 1984, 260 p.

5. Nikishin A.V., Sedimentatsionnaya ritmichnost' i sopostavlenie razrezov srednego pliotsena Yuzhno-Kaspiyskoy vpadiny (Sedimentation rhythm and comparison of sections of the Middle Pliocene of the South Caspian basin), Collected papers “Problemy geologii i neftegazonosnosti vpadin vnutrennikh morey” (Problems of geology and oil-gas content of the basins of inland seas), 1981, pp. 60–66.

6. Shilov G.Ya., Kompleksnoe izuchenie effuzivnykh i karbonatnykh razrezov metodami promyslovoy geofiziki (na primere mestorozhdeniy Kyurdamirskoy neftegazonosnyy oblasti Azerbaydzhana) (Complex study of effusive and carbonate sections by the methods of field geophysics (on the example of Kurdamir oil and gas fields of Azerbaijan)): thesis of candidate of geological and mineralogical science, Moscow, 1980.

7. Shilov G.Ya., Mamedova I.M., Determination of the boundary value of the effective porosity of productive reservoirs according to well logging data when studying heterogeneous geological sections (In Russ.), Izvestiya vuzov “Neft' i gaz”, 1991, no. 6, pp. 14–18.


In the first half of the Pliocene epoch, the productive stratum sedimentation proceeded at the expense of feeding areas rich with quartz component. These areas were located to the north of the Khachmaz relic. They represented both lowlands, and plateaus and uplands, formed as a result of tectonic movements that took place until the end of Pontic time. It should be noted that the development of the basin was due not only to deflection of the bottom, but also to the confluence of large rivers, whose regime was mainly controlled by climatic factors. The latter influenced the change in the amount of water in the rivers and the rate of their flow. The main drainage arteries at this time were: Paleo-Kura, Paleo-Volga, Paleo-Uzboi, as well as Paleo-Araz, Paleo-Pirsagat, Paleo-Ural, Paleo-Emba, Paleo-Sulik, Paleo-Terek and others. According to the principle of the upper asymmetry, seven large rhythms were singled out in the section of the PS of the productive stratum of the Apsheron peninsula. The boundaries between these rhythms correspond to the interruptions in the sedimentation, and in the sole of each rhythm traces of erosion of the regressive part of the previous rhythm. Facies interpretation of well logging data allows to establish the peculiarities of sedimentation conditions on local sites of separate regions that differ from each other in the genesis of precipitation. It is known that the basin in the Pliocene age of the productive stratum throughout the entire time of existence was distinguished by a complex coastal relief influenced by delta systems (including underwater parts) of rivers. All this makes it difficult to reconstruct the sedimentation environments in some areas, despite the fact that the general regularities of the sedimentation of the Pliocene sediments have been identified and studied for the basin of the South Caspian basin.

References

1. Kocharli Sh.S., Problemnye voprosy neftegazovoy geologii Azerbaydzhana (Problem issues of oil and gas geology of Azerbaijan), Baku, 2015, 278 p.

2. Abasov M.T., Kondrushkin Yu.M., Aliyarov R.Yu. et al., Izuchenie i prognozirovanie parametrov slozhnykh prirodnykh rezervuarov nefti i gaza Yuzhno-Kaspiyskoy vpadiny (Study and prediction of parameters of complex natural oil and gas reservoirs of the South Caspian Depression), Baku, 2007, 217 p.

3. Mamedov P.Z., Seysmostratigraficheskie issledovaniya geologicheskogo stroeniya osadochnogo chekhla Yuzhno-Kaspiyskoy megavpadiny v svyazi s perspektivami neftegazonosnosti (Seismostratigraphic studies of the geological structure of the sedimentary cover of the South Caspian megabasin in connection with the prospects of oil and gas potential): thesis of doctor of geological and mineralogical science, Baku, 1992.

4. Muromtsev V.S., Elektricheskaya geologiya peschanykh tel – litologicheskikh lovushek nefti i gaza (Electrical geology of sandy bodies-lithological traps of oil and gas), Moscow: Nedra Publ., 1984, 260 p.

5. Nikishin A.V., Sedimentatsionnaya ritmichnost' i sopostavlenie razrezov srednego pliotsena Yuzhno-Kaspiyskoy vpadiny (Sedimentation rhythm and comparison of sections of the Middle Pliocene of the South Caspian basin), Collected papers “Problemy geologii i neftegazonosnosti vpadin vnutrennikh morey” (Problems of geology and oil-gas content of the basins of inland seas), 1981, pp. 60–66.

6. Shilov G.Ya., Kompleksnoe izuchenie effuzivnykh i karbonatnykh razrezov metodami promyslovoy geofiziki (na primere mestorozhdeniy Kyurdamirskoy neftegazonosnyy oblasti Azerbaydzhana) (Complex study of effusive and carbonate sections by the methods of field geophysics (on the example of Kurdamir oil and gas fields of Azerbaijan)): thesis of candidate of geological and mineralogical science, Moscow, 1980.

7. Shilov G.Ya., Mamedova I.M., Determination of the boundary value of the effective porosity of productive reservoirs according to well logging data when studying heterogeneous geological sections (In Russ.), Izvestiya vuzov “Neft' i gaz”, 1991, no. 6, pp. 14–18.




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