SEISMOGEOLOGICAL CRITERIA FOR THE GAS POTENTIAL OF APTIAN–CENOMANIAN SEDIMENTS IN THE NORTH OF WEST SIBERIA
(by the example of the Yubileinoe field)
V.A. Kontorovich1,2, E.S. Surikova1, and D.V. Ayunova1,2
1 A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences,
pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
Keywords: Seismic exploration, petroleum prediction, gas pool, «bright spot», dynamic parameters of a seismic record, West Siberia
Abstract
Seismogeological criteria for the gas potential of the Aptian–Cenomanian sediments of West Siberia are substantiated. The research was carried out by the method of integrated interpretation of seismic materials, well logs, well test results, and petrophysical studies. As a reference object we used the Yubileinoe oil and gas con-densate field located in the Nadym–Pur interfluve, in which a unique gas deposit is concentrated in the Cenoma-nian reservoir PK1 and the Albian sand bed PK18. Based on the research results, seismogeologic criteria for gas prediction have been formulated.
Massive Cenomanian gas pools are displayed in wave seismic fields by: (1) the presence of reflectors formed at the gas–water contacts in time sections and a decrease in the amplitude parameters of the reflector G confined to the roof of Cenomanian sequence; (2) an increase in the time thickness (Δt), a decrease in the interval velocities (vint), and a decrease in the amplitude–energy parameters of a seismic record in the Aptian–Cenomanian sequence.
Aptian–Albian sheet gas pools are displayed in the wave fields by a drastic increase in the amplitudes of a seismic record, forming «bright spot» anomalies in the time sections.
DOI: 10.15372/RGG2019077
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