Temperature conditions and level of organic metamorphism in the south-eastern part of the Terek-Caspian trough

UDK: 558.98:556.314.7
DOI: 10.24887/0028-2448-2019-2-18-22
Key words: formation temperatures, vitrinite reflectance, organic matter, hydrocarbons, maturity
Authors: А.А. Feyzullayev (Institute of Geology and Geophysics Azerbaijan National Academy of Science, Azerbaijan, Baku), G.G. Ismaylova (Institute of Geology and Geophysics Azerbaijan National Academy of Science, Azerbaijan, Baku), A.N. Huseynova (Institute of Geology and Geophysics Azerbaijan National Academy of Science, Azerbaijan, Baku)

The Terek-Caspian foredeep is located between the epi-Hercynian Scythian Plate and the Alpine folding of the Greater Caucasus (the south-east periclinal of deflection). The deflection has an asymmetric structure. The offshore part of the Terek-Caspian trough occupies the western part of the Middle Caspian Sea and consists of two basins: the Terek-Sulak in the north and North-Apsheron in the south-east. These depressions are separated by Yalama-Samur horseback of the Turanian Plate. The average thickness of the sedimentary cover of Terek-Caspian foredeep is about 12 km. At Yalama-Samur horseback (offshore) organic matter of the Jurassic interval of the section is classified as early mature medium.

Methodology of the conducted analysis is based on the patterns of change of the current temperature and paleo-temperature (vitrinite reflectance) through the section, and direct assessment of the maturity of organic matter (pyrolysis) and hydrocarbon (biomarkers). According to the actual data on the Yalama-Samur zone the process of petroleum formation begins approximately with a depth of 3 km. Thus, based on these temperatures, the values of paleo-temperature target and the spore coloration index (SCI), we can conclude that the upper threshold of oil generation in the pre-Caspian-Quba region (land) is located in the depth interval of 2.5-3.0 km. These conclusions well correspond to the character changes in gas composition (the sum С2Н6+) in case of deposits of Siyazan monocline.

Within the Apsheron archipelago, the zone covering the Neft Dashlary and Palchig Pilpilas areas is of interest for performing exploration work on the underlying productive strata (main oil and gas object of the South Caspian basin) Miocene sediments (oil reservoir).

References

1. Yakovlev V., Senin B., Some questions of the geological structure and assessment of the prospects of the oil and gas potential of the Central Caspian (In Russ.), Tekhnologii T·EK, 2003, August, pp. 1–17

2. Rachinsky M.Z., Kerimov V.Y., Fluid dynamics of oil and gas reservoirs, New Jersey- Massachusetts: Wiley- Scrivener Publishing, 2015, 607 p.

3. Miles J.A., Illustrated glossary of petroleum geochemistry, New York: Oxford University Press, 1989, 137 p.

4. Tissot B.P., Welte D.H., Petroleum formation and occurrence, Springer-Verlag Telos, 1984, 699 p.

5. Peters K.E., Moldowan J.M., The biomarker guide: Interpreting molecular fossils in petroleum and ancient sediments, Prentice Hall, Englewood Cliffs, NJ, 1993, 363 p.

6. Bao J.P., Wang T.G., Zhou Y.Q. et al., The relationship between methyl phenanthrene ratios and the evolution of organic matter, J. Jh. Petrol. Ins., 1992, no. 14, pp. 8–13.

7. Faber E.Z., Isotopengeochemie gasformiger Kohlenwasserstoffe (In German), Erdole, Erdgas and Kohle, 1987, V. 103, pp. 210-218.

8. Abasov M.T., Aliyarov R.YU., Kondrushkin YU.M. et al., Thermobaric regime of the section of the deposits of the South Caspian sedimentary basin (In Russ.), Proceedings of Institute of Geology of the Azerbaijan Academy of Sciences, 2003, V. 31, pp. 5–20.

9. Aliyev S.A., Geotermal’nyye polya depressionnykh zon v YUzhno-Kaspiyskom basseyne i ikh svyaz’ neftegaznosnost’yu (Geothermal fields of depression zones in the South Caspian basin and its relation with oil and gas bearing): thesis of doctor of geological and mineralogical science, Baku, 1988.

10. Mekhtiyev SH.F., Aliyev S.A., On factors impacting the geothermal stage of the oil fields of Azerbaijan (In Russ.), Geologiya nefti i gaza, 1960, no. 3, pp. 25–27.

11. Mukhtarov A.SH., Struktura teplovogo polya osadochnogo kompleksa YUzhno-Kaspiyskogo basseyna (Structure of the thermal field of the sedimentary complex of the South Caspian basin): thesis of doctor of geological and mineralogical science, Baku, 2011.

12. Feyzullayev A.A., Guseynov D.A., Aliyeva E.G. et al. Uglevodorodnyy potentsial i usloviya ego realizatsii v YUV chasti Tersko-Kaspiyskogo progiba (Hydrocarbon potential and conditions for its realization in the South of the part of the Terek-Caspian trough), Baku: Publ. of Institute of Geology and Geophysics of ANAS, 2016, 67 p.

13. Mekhtiyev SH.F., Mirzadzhanzade A.KH., Aliyev S.A., Teplovoy rezhim neftyanykh i gazovykh mestorozhdeniy (Thermal regime of oil and gas fields), Baku, Azerneshr Publ., 1960, 384 p.

14. Wavrek D.A. ,Central Caspian petroleum systems synthesis - 2005 Work Programs and Review (Yalama Emphasis), PSI Technical Report no. 05-2-04 for LukOil Overseas Holding LTD Moscow, 2005, 40 p.

15. Katoshin A.F., Matyashov S.V., Belyayeva N.V. et al., Osobennosti formirovaniya YAlama-Samurskogo podnyatiya akvatorii Srednego Kaspiya (Features of the formation of the Yalama-Samurian uplift of the water area of the Middle Caspian), Proceedings of International conference “Stroyeniye i neftegazonosnost’ Kaspiyskogo regiona” (The structure and oil and gas potential of the Caspian region), Volgograd: Publ. of LUKOYL Oversiz Servis Ltd., 2006, pp. 45–51.

The Terek-Caspian foredeep is located between the epi-Hercynian Scythian Plate and the Alpine folding of the Greater Caucasus (the south-east periclinal of deflection). The deflection has an asymmetric structure. The offshore part of the Terek-Caspian trough occupies the western part of the Middle Caspian Sea and consists of two basins: the Terek-Sulak in the north and North-Apsheron in the south-east. These depressions are separated by Yalama-Samur horseback of the Turanian Plate. The average thickness of the sedimentary cover of Terek-Caspian foredeep is about 12 km. At Yalama-Samur horseback (offshore) organic matter of the Jurassic interval of the section is classified as early mature medium.

Methodology of the conducted analysis is based on the patterns of change of the current temperature and paleo-temperature (vitrinite reflectance) through the section, and direct assessment of the maturity of organic matter (pyrolysis) and hydrocarbon (biomarkers). According to the actual data on the Yalama-Samur zone the process of petroleum formation begins approximately with a depth of 3 km. Thus, based on these temperatures, the values of paleo-temperature target and the spore coloration index (SCI), we can conclude that the upper threshold of oil generation in the pre-Caspian-Quba region (land) is located in the depth interval of 2.5-3.0 km. These conclusions well correspond to the character changes in gas composition (the sum С2Н6+) in case of deposits of Siyazan monocline.

Within the Apsheron archipelago, the zone covering the Neft Dashlary and Palchig Pilpilas areas is of interest for performing exploration work on the underlying productive strata (main oil and gas object of the South Caspian basin) Miocene sediments (oil reservoir).

References

1. Yakovlev V., Senin B., Some questions of the geological structure and assessment of the prospects of the oil and gas potential of the Central Caspian (In Russ.), Tekhnologii T·EK, 2003, August, pp. 1–17

2. Rachinsky M.Z., Kerimov V.Y., Fluid dynamics of oil and gas reservoirs, New Jersey- Massachusetts: Wiley- Scrivener Publishing, 2015, 607 p.

3. Miles J.A., Illustrated glossary of petroleum geochemistry, New York: Oxford University Press, 1989, 137 p.

4. Tissot B.P., Welte D.H., Petroleum formation and occurrence, Springer-Verlag Telos, 1984, 699 p.

5. Peters K.E., Moldowan J.M., The biomarker guide: Interpreting molecular fossils in petroleum and ancient sediments, Prentice Hall, Englewood Cliffs, NJ, 1993, 363 p.

6. Bao J.P., Wang T.G., Zhou Y.Q. et al., The relationship between methyl phenanthrene ratios and the evolution of organic matter, J. Jh. Petrol. Ins., 1992, no. 14, pp. 8–13.

7. Faber E.Z., Isotopengeochemie gasformiger Kohlenwasserstoffe (In German), Erdole, Erdgas and Kohle, 1987, V. 103, pp. 210-218.

8. Abasov M.T., Aliyarov R.YU., Kondrushkin YU.M. et al., Thermobaric regime of the section of the deposits of the South Caspian sedimentary basin (In Russ.), Proceedings of Institute of Geology of the Azerbaijan Academy of Sciences, 2003, V. 31, pp. 5–20.

9. Aliyev S.A., Geotermal’nyye polya depressionnykh zon v YUzhno-Kaspiyskom basseyne i ikh svyaz’ neftegaznosnost’yu (Geothermal fields of depression zones in the South Caspian basin and its relation with oil and gas bearing): thesis of doctor of geological and mineralogical science, Baku, 1988.

10. Mekhtiyev SH.F., Aliyev S.A., On factors impacting the geothermal stage of the oil fields of Azerbaijan (In Russ.), Geologiya nefti i gaza, 1960, no. 3, pp. 25–27.

11. Mukhtarov A.SH., Struktura teplovogo polya osadochnogo kompleksa YUzhno-Kaspiyskogo basseyna (Structure of the thermal field of the sedimentary complex of the South Caspian basin): thesis of doctor of geological and mineralogical science, Baku, 2011.

12. Feyzullayev A.A., Guseynov D.A., Aliyeva E.G. et al. Uglevodorodnyy potentsial i usloviya ego realizatsii v YUV chasti Tersko-Kaspiyskogo progiba (Hydrocarbon potential and conditions for its realization in the South of the part of the Terek-Caspian trough), Baku: Publ. of Institute of Geology and Geophysics of ANAS, 2016, 67 p.

13. Mekhtiyev SH.F., Mirzadzhanzade A.KH., Aliyev S.A., Teplovoy rezhim neftyanykh i gazovykh mestorozhdeniy (Thermal regime of oil and gas fields), Baku, Azerneshr Publ., 1960, 384 p.

14. Wavrek D.A. ,Central Caspian petroleum systems synthesis - 2005 Work Programs and Review (Yalama Emphasis), PSI Technical Report no. 05-2-04 for LukOil Overseas Holding LTD Moscow, 2005, 40 p.

15. Katoshin A.F., Matyashov S.V., Belyayeva N.V. et al., Osobennosti formirovaniya YAlama-Samurskogo podnyatiya akvatorii Srednego Kaspiya (Features of the formation of the Yalama-Samurian uplift of the water area of the Middle Caspian), Proceedings of International conference “Stroyeniye i neftegazonosnost’ Kaspiyskogo regiona” (The structure and oil and gas potential of the Caspian region), Volgograd: Publ. of LUKOYL Oversiz Servis Ltd., 2006, pp. 45–51.


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