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The description of maturation process for the Paleozoic deposits of the flanks of Caspian depression and Pachelma Aulacogen

Authors: A.V. Stepanov, G.N. Samojlenko (LUKOIL-Engineering Limited VolgogradNIPImorneft Branch Office in Volgograd), S.I. Chizhov (TPO "RITEK" - "Volgogradneftegaz")

The catagenesis of Paleozoic deposits of Caspian Depression and its outline tectonic zones is reviewed in the present article. The nature of change of reservoir rocks at large depths and their connection with reservoir pressure have been analyzed. Applications of the methods of modern thermodynamic analysis based on the method of Gibbs and Helmholtz potentials minimization makes it possible to illustrate the essential role of the reservoir fluids in reservoir types formation and anomalously high reservoir pressure.

Key words: flanks of Caspian Depression, catagenesis of reservoirs, abnormal reservoir pressures, minimization of thermodynamic potentials.

References
1. Karnyushina E.E., Burlin Yu.N., Geologiya i geokhimiya goryuchikh iskopaemykh (Geology and geochemistry of combustible minerals), 2003, pp. 69-84.
2. Proshlyakov B.K., Gal'yanova T.I., Pimenov Yu.G., Kollektorskie svoystva osadochnykh porod na bol'shikh glubinakh (Reservoir properties of sedimentary
rocks at great depths), Moscow: Nedra Publ., 1987, 200 p.
3. Il'chenko V.P., Neftegazovaya gidrogeologiya podsolevykh otlozheniy
Prikaspiyskoy vpadiny (Oil and gas hydrogeology of subsalt deposits of the
Caspian Basin), Moscow: Nedra Publ., 1998, 288 p.
4. Aleksandrov B.L., Anomal'no-vysokie plastovye davleniya v neftegazonosnykh
basseynakh (Abnormally high reservoir pressure in the oil and gas
basins), Moscow: Nedra Publ., 1987, 216 p.
5. Karpov I.K., Stepanov A.N., Chudnenko K.V., Bychinskiy V.A., Collected papers “Geokhimicheskoe modelirovanie i materinskie porody neftegazonosnykh
basseynov” (Geochemical modeling and source rock of oil and gas
basins), St. Petersburg: Publ. of VNIGRI, 1998, pp. 48-61.
6. Karpov I.K., Stepanov A.N., Bychinskiy V.A., Proceedings of II International
Conference on Petroleum Chemistry, Tomsk: Publ. of The Institute of Petroleum
Chemistry SB RAS, 1994, pp. 55-56.
7. Barker C., Calculated volume and pressure changes during the thermal
cracking of oil to gas in reservoir, AAPG bull., 1990, V. 74, no. 8, pp. 1254-1261.
8. Stepanov A.N., Collected papers “Voprosy geologii Prikaspiya i shel'fa
Kaspiyskogo morya” (Questions of Geology of Caspian region and the
Caspian Sea shelf), 2004, V. 62, pp. 192-204.
9. Stepanov A.N., Proceedings of III All-Russian Seminar “Modelirovanie neravnovesnykh
sistem – 2000” (Modeling of nonequilibrium systems - 2000), Krasnoyarsk:
Institute of Computational Modelling of SB RAS, 2000, 249 p.
10. Bazhenova T.K., Gembitskaya L.A., Collected papers “Geokhimicheskoe
modelirovanie i materinskie porody neftegazonosnykh basseynov Rossii i
SNG” (Geochemical modeling and source rock of oil and gas basins of Russia
and the CIS), St. Petersburg: Publ. of VNIGRI, 2000, pp. 23-27.
11. Barker C., Takach N.E., Prediction of gas composition in ultradeep sandstone
reservoir, AAPG bull., 1992, V. 76, no. 12, pp. 1859-1873.
12. Stepanov A.N., Bychinskiy V.A., Karpov I.K. et al., Collected papers “TEK
Rossii – osnova protsvetaniya strany” (FEC of Russia - the basis of the country's
prosperity), St. Petersburg: Publ. of VNIGRI, 2004, pp. 60-65.
13. Bulin N.K., Egorkin A.V., Regional'nyy prognoz neftegazonosnosti nedr po
glubinnym seysmicheskim kriteriyam(Regional forecast of oil and gas potential
of subsoil using deep seismic criteria), Moscow: Publ. of Tsentr GEON Publ.,
2000, 194 p.
14. Frid A.M., Yufin P.A., Doklady akademii nauk – Transactions (Doklady) of
the Russian Academy of Sciences. Earth Science Sections, 1991, V. 319, no. 5,
pp. 1213-1217.
15. Dmitrievskiy A.N., Balanyuk I.E., Karakin A.N. et al., Gazovaya promyshlennost' – GAS Industry of Russia, 2000, no. 1, pp. 2-5. 

The catagenesis of Paleozoic deposits of Caspian Depression and its outline tectonic zones is reviewed in the present article. The nature of change of reservoir rocks at large depths and their connection with reservoir pressure have been analyzed. Applications of the methods of modern thermodynamic analysis based on the method of Gibbs and Helmholtz potentials minimization makes it possible to illustrate the essential role of the reservoir fluids in reservoir types formation and anomalously high reservoir pressure.

Key words: flanks of Caspian Depression, catagenesis of reservoirs, abnormal reservoir pressures, minimization of thermodynamic potentials.

References
1. Karnyushina E.E., Burlin Yu.N., Geologiya i geokhimiya goryuchikh iskopaemykh (Geology and geochemistry of combustible minerals), 2003, pp. 69-84.
2. Proshlyakov B.K., Gal'yanova T.I., Pimenov Yu.G., Kollektorskie svoystva osadochnykh porod na bol'shikh glubinakh (Reservoir properties of sedimentary
rocks at great depths), Moscow: Nedra Publ., 1987, 200 p.
3. Il'chenko V.P., Neftegazovaya gidrogeologiya podsolevykh otlozheniy
Prikaspiyskoy vpadiny (Oil and gas hydrogeology of subsalt deposits of the
Caspian Basin), Moscow: Nedra Publ., 1998, 288 p.
4. Aleksandrov B.L., Anomal'no-vysokie plastovye davleniya v neftegazonosnykh
basseynakh (Abnormally high reservoir pressure in the oil and gas
basins), Moscow: Nedra Publ., 1987, 216 p.
5. Karpov I.K., Stepanov A.N., Chudnenko K.V., Bychinskiy V.A., Collected papers “Geokhimicheskoe modelirovanie i materinskie porody neftegazonosnykh
basseynov” (Geochemical modeling and source rock of oil and gas
basins), St. Petersburg: Publ. of VNIGRI, 1998, pp. 48-61.
6. Karpov I.K., Stepanov A.N., Bychinskiy V.A., Proceedings of II International
Conference on Petroleum Chemistry, Tomsk: Publ. of The Institute of Petroleum
Chemistry SB RAS, 1994, pp. 55-56.
7. Barker C., Calculated volume and pressure changes during the thermal
cracking of oil to gas in reservoir, AAPG bull., 1990, V. 74, no. 8, pp. 1254-1261.
8. Stepanov A.N., Collected papers “Voprosy geologii Prikaspiya i shel'fa
Kaspiyskogo morya” (Questions of Geology of Caspian region and the
Caspian Sea shelf), 2004, V. 62, pp. 192-204.
9. Stepanov A.N., Proceedings of III All-Russian Seminar “Modelirovanie neravnovesnykh
sistem – 2000” (Modeling of nonequilibrium systems - 2000), Krasnoyarsk:
Institute of Computational Modelling of SB RAS, 2000, 249 p.
10. Bazhenova T.K., Gembitskaya L.A., Collected papers “Geokhimicheskoe
modelirovanie i materinskie porody neftegazonosnykh basseynov Rossii i
SNG” (Geochemical modeling and source rock of oil and gas basins of Russia
and the CIS), St. Petersburg: Publ. of VNIGRI, 2000, pp. 23-27.
11. Barker C., Takach N.E., Prediction of gas composition in ultradeep sandstone
reservoir, AAPG bull., 1992, V. 76, no. 12, pp. 1859-1873.
12. Stepanov A.N., Bychinskiy V.A., Karpov I.K. et al., Collected papers “TEK
Rossii – osnova protsvetaniya strany” (FEC of Russia - the basis of the country's
prosperity), St. Petersburg: Publ. of VNIGRI, 2004, pp. 60-65.
13. Bulin N.K., Egorkin A.V., Regional'nyy prognoz neftegazonosnosti nedr po
glubinnym seysmicheskim kriteriyam(Regional forecast of oil and gas potential
of subsoil using deep seismic criteria), Moscow: Publ. of Tsentr GEON Publ.,
2000, 194 p.
14. Frid A.M., Yufin P.A., Doklady akademii nauk – Transactions (Doklady) of
the Russian Academy of Sciences. Earth Science Sections, 1991, V. 319, no. 5,
pp. 1213-1217.
15. Dmitrievskiy A.N., Balanyuk I.E., Karakin A.N. et al., Gazovaya promyshlennost' – GAS Industry of Russia, 2000, no. 1, pp. 2-5. 


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