Probable oil resource localisation for Jurassic and Cretaceous oil-and-gas complexes in Ust-Tym mega depression

Authors: G.A. Lobova, S.A. Popov (National Research Tomsk Polytechnic University, RF, Tomsk), A.N. Fomin (A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RAS, RF, Tomsk)

Key words: paleotemperature, the centres of generation of the oils, resources.

The main objective of this work is oil and gas potential evaluation in Upper Jurassic – Cretaceous, Paleozoic – Lower - Jurassic Ust-Tym mega depression deposits based on paleotectonic reconstruction and paleotemperature modeling. The thermal history of all oil generation series in the cross section of 10 deep wells was reconstructed. Sets of maps showing the distribution of geotemperature and intensive oil generation areas location in Bazhenov and Togur series for 10 key sedimentation time-periods were constructed. These were identified due to the main oil generation zone geotemperature. The integrated ratio including oil geotemperature generation zones and generation time period for separate studied areas was determined. Schematic density maps for primary-accumulated Bazhenov and Togur oils were constructed. Efficient prospect and exploration survey for Cretaceous and Upper Jurassic, Middle Jurassic, Lower Jurassic and Paleozoic oil and gas generation complexes within the separate zones and the mega depression edges was recommended.

References

1. Burshteyn L.M., Zhidkova L.V., Kontorovich A.E., Melenevskiy V.N., Geologiya i geofizika - Russian Geology and Geophysics, 1997, V. 38, no. 6, pp. 1070–1078.

2. Ermakov V.I., Skorobogatov V.A., Teplovoe pole i neftegazonosnost' molodykh plit SSSR (Heat field and oil-and-gas content of the young platform of the Soviet Union), Moscow: Nedra Publ., 1986, 222 p.

3. Isaev V.I., Gulenok R.Yu., Veselov O.V., et al., Geologiya nefti i gaza - The journal Oil and Gas Geology, 2002, no., 6, pp. 48–54.

4. Isaev V.I., Lobova G.A., Royak M.E., Fomin A.N., Geofizicheskiy zhurnal, 2009, V. 31, no. 2, pp. 15–46.

5. Isaev V.I., Fomin A.N., Geologiya i geofizika – Russian Geology and Geophysics, 2006, V. 47, no. 6, pp. 734–745.

6. Kontorovich V.A., Tektonika i neftegazonosnost' mezozoysko-kaynozoyskikh otlozheniy yugo-vostochnykh rayonov Zapadnoy Sibiri (Tectonics and petroleum potential of Mesozoic and Cenozoic sediments of the south-eastern regions of West Siberia), Novosibirsk: Publ. of SB RAS, 2002, 253 p.

Key words: paleotemperature, the centres of generation of the oils, resources.

The main objective of this work is oil and gas potential evaluation in Upper Jurassic – Cretaceous, Paleozoic – Lower - Jurassic Ust-Tym mega depression deposits based on paleotectonic reconstruction and paleotemperature modeling. The thermal history of all oil generation series in the cross section of 10 deep wells was reconstructed. Sets of maps showing the distribution of geotemperature and intensive oil generation areas location in Bazhenov and Togur series for 10 key sedimentation time-periods were constructed. These were identified due to the main oil generation zone geotemperature. The integrated ratio including oil geotemperature generation zones and generation time period for separate studied areas was determined. Schematic density maps for primary-accumulated Bazhenov and Togur oils were constructed. Efficient prospect and exploration survey for Cretaceous and Upper Jurassic, Middle Jurassic, Lower Jurassic and Paleozoic oil and gas generation complexes within the separate zones and the mega depression edges was recommended.

References

1. Burshteyn L.M., Zhidkova L.V., Kontorovich A.E., Melenevskiy V.N., Geologiya i geofizika - Russian Geology and Geophysics, 1997, V. 38, no. 6, pp. 1070–1078.

2. Ermakov V.I., Skorobogatov V.A., Teplovoe pole i neftegazonosnost' molodykh plit SSSR (Heat field and oil-and-gas content of the young platform of the Soviet Union), Moscow: Nedra Publ., 1986, 222 p.

3. Isaev V.I., Gulenok R.Yu., Veselov O.V., et al., Geologiya nefti i gaza - The journal Oil and Gas Geology, 2002, no., 6, pp. 48–54.

4. Isaev V.I., Lobova G.A., Royak M.E., Fomin A.N., Geofizicheskiy zhurnal, 2009, V. 31, no. 2, pp. 15–46.

5. Isaev V.I., Fomin A.N., Geologiya i geofizika – Russian Geology and Geophysics, 2006, V. 47, no. 6, pp. 734–745.

6. Kontorovich V.A., Tektonika i neftegazonosnost' mezozoysko-kaynozoyskikh otlozheniy yugo-vostochnykh rayonov Zapadnoy Sibiri (Tectonics and petroleum potential of Mesozoic and Cenozoic sediments of the south-eastern regions of West Siberia), Novosibirsk: Publ. of SB RAS, 2002, 253 p.


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