Seismo-geological models of stratigraphic sequences and their application to oil and gas exploration in west Siberia

Conference · Wed Sep 01 00:00:00 EDT 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6849216

Mkrtchyan, O M ^[1]

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1. Institute of Geology and Exploration of Combustible Fuels, Moscow (Russian Federation)

In west Siberia, large structural prospects for oil exploration have been exhausted. Further discoveries are expected to be made in small to medium structural traps and in lithostratigraphic traps. Prospecting and exploration for hydrocarbons in lithostratigraphic traps is based on new seismo-geological models of hydrocarbon-bearing sequences. In middle Paleozoic rocks, small hydrocarbon accumulations have been found in structural highs; the reservoirs are composed of fractured vuggy carbonates. Seismostratigraphic criteria for prediction of such traps are uncertain. The Lower-Middle Jurassic sequence consists of continental and partially of marine clastic rocks. The sequence is believed to contain considerable hydrocarbon resources in lithostratigraphic traps in basal sandstones and in pinch-out zones of Lower Jurassic sandstones. In the upper part of the sequence, oil pools have been discovered in channel sandstone bodies. Two different areas of oil accumulations are found in the Callovian-Oxfordian sequence. The Bazhenov Formation bituminous shales of Volgian-Berriasian contain sporadically distributed fractured-porous reservoirs. Accumulations in these reservoirs are characterized by irregular oil saturation. The Neocomian sequence consists of rocks deposited on the shallow-water shelf and on the basinal slope. Seismo-geological data indicate that the sequence is prospective for discovery of hydrocarbons in lithostratigraphic traps. The clinoform consists of laterally prograding strata; most prospective are frontal and depocentral parts of the strata which contain sandstone reservoirs of medium to poor quality. Lithostratigraphic traps in the shelf sequence can be found in the marginal parts of the paleoshelf where regional pinch-out zones and sandstones lenses are common. The Aptian-Cenomanian sequence deposited under terrestrial and coastal conditions is dominantly gas prone. New hydrocarbon discoveries in this sequence are expected in structural traps.

• OSTI ID: 6849216
• Report Number(s): CONF-9310237-; CODEN: AABUD2
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:9; Conference: American Association of Petroleum Geologists (AAPG) mid-continent section meeting, Amarillo, TX (United States), 10-12 Oct 1993; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
GEOLOGIC STRATA
GEOLOGIC TRAPS
GEOLOGIC STRUCTURES
FORECASTING
RUSSIAN FEDERATION
EXPLORATION
CARBONATE ROCKS
GEOLOGIC MODELS
HYDROCARBONS
JURASSIC PERIOD
PALEOZOIC ERA
RESERVOIR ROCK
SANDSTONES
SEISMIC SURVEYS
SHALES
SIBERIA
STRATIGRAPHY
ASIA
EASTERN EUROPE
EUROPE
GEOLOGIC AGES
GEOLOGY
GEOPHYSICAL SURVEYS
MESOZOIC ERA
ORGANIC COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
SURVEYS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration