Kontorovich info 4.2018 | oilandgasgeology

Якорь 1

V.A. Kontorovich, L.M. Kalinina, A.Yu. Kalinin, M.V. Solov'ev

Petroleum prospects of the West Siberian Palaeozoic, geoseismic models of reference fields

DOI: 10.31087/0016-7894-2018-4-5-15

More than 60 oil and gas fields in Western Siberia are associated with the Palaeozoic deposits, which are among the least studied oil and gas prospects in the province. Analysis of exploration results suggests that Palaeozoic hydrocarbon reservoirs are associated with acid igneous rocks (granite and acid volcanic rocks), organic and dolomitized limestone in Palaeozoic bedrocks, and argillaceous and siliceous rocks of weathering crust. The paper discusses models of oil and gas pools, and defines geoseismic criteria of petroleum prospects identification in the Palaeozoic deposits represented by different lithological varieties. Analysis of geological and geophysical data shows that the most promising objects in terms of bedrock Palaeozoic (Horizon M1) petroleum potential are the low‑contrast erosion and tectonic uplifts, as well as buried and fault‑bounded blocks situated on monoclines, which are composed of organic and dolomitized limestone not overlapped by weathering crust. In seismic time sections, a slight amplitude decrease in Ф2 reflection horizon associated with the Palaeozoic Top is typical for these erosion and tectonic uplifts; while abnormally high amplitude and energy characteristics are typical of the fault‑bounded blocks. The most promising among the argillaceous and siliceous rocks of the weathering crust (Horizon M) and acid igneous rocks (granite and acid volcanic rocks) in terms of petroleum potential are the contrast erosion and tectonic basement uplifts, which were subject to intensive disintegration; the abnormally low amplitudes of the Ф2 reflection horizon are typical of them in seismic wavefields.

Key words: palaeozoic; carbonates; organic and dolomitized limestone; granite; acid volcanic rocks; argillaceous and siliceous rock; time section; reflection horizon; wavefields; amplitude and energy characteristics; oil and gas potential; petroleum prospect; pool.

For citation: Kontorovich V.A., Kalinina L.M., Kalinin A.Yu., Solovyev M.V. Petroleum prospects of the West Siberian Palaeozoic, geoseismic models of reference fields. Geologiya nefti i gaza. 2018;(4):5–15. DOI: 10.31087/0016‑7894‑2018‑4‑5‑15.

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