A.E. Kontorovich, S.V. Rodyakin, L.M. Burshtein, E.A. Kostyreva, S.V. Ryzhova, P.A. Yan
 
Porosity and oil saturation of pore space in the Bazhenov Formation rocks
DOI 10.31087/0016-7894-2018-5-61-73

Regularities of open porosity and oil saturation distribution in the Bazhenov rocks are studied. Primary cavitation in the Bazhenov Fm is of a secondary nature; it is formed as a result of kerogene destruction during catagenesis with generation of liquid and gaseous products. Oil saturated near-horizontal fracture-like (foliation) and vuggy porous volume capacities were formed as a result of sequential lithogenesis processes in the formation rocks. Porosity of the Bazhenov rocks is determined by OM catagenesis level. In the zones where OM catagenesis reached the main stage of oil generation (second half of MK1_1 level, МК2_1 level, МК_2), open porosity of rocks varies from fractions of a percent to 12 %; at the same time, a trend of maximum open porosity values growth with the increase of organic carbon concentration in the rocks is clearly observed. In the zones where OM catagenesis in the Bazhenov reached MK1_1 level, beginning of МК2_1 level, open porosity of rocks ranges from fractions of a percent to 8 %; in the zone where MK1_1 level of catagenesis is reached, porosity doesn’t exceed 4 %. Regularities of oil saturation variations in open porosity were studied. In the oil window (MK1_1 , МК2_1 , МК_2 levels), oil saturation exceeding 0.75 predominates. In the zones where catagenesis reached MK1_1 level, beginning of МК2_1 level, oil saturation of open pore space doesn’t exceed 0.5. In the zones with MK1_1 level of catagenesis, oil saturation of open pore space is below 0.3 %. Map of oil saturation of the Bazhenov rocks is created.

 

Key words: porosity; oil saturaiton; Bazhenov Formation; West Siberia.

For citation: Kontorovich A.E., Rodyakin S.V., Burshtein L.M., Kostyreva E.A., Ryzhova S.V., Yan P.A. Porosity and oil saturation of the Bazhenov Formation rocks. Geologiya nefti i gaza = Oil and gas geology. 2018;(5):61–73. DOI: 10.31087/0016-7894-2018-5-61-73

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A.E. Kontorovich

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

KontorovichAE@ipgg.sbras.ru

S.V. Rodyakin

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

RodyakinSV@ipgg.sbras.ru

L.M. Burshtein

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

Levi@ipgg.sbras.ru

E.A. Kostyreva

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

KostyrevaEA@ipgg.sbras.ru

S.V. Ryzhova

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

P.A. Yan

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

YanPA@ipgg.sbras.ru