The petroleum basins of the sea of Okhotsk

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

OSTI ID:6965295

Khvedchuk, I ^[1]

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1. Oil and Gas Reasearch Institute, Moscow (Russian Federation)

The Okhotsk area includes the major oil and gas basins of north Sakhalin and west Kamchatka, where more than 70 fields have been discovered. The basins consist of Tertiary cover (marine, coastal and continental terrigenous, and siliceous volcanogenic and volcanoclastic rocks) and pre-Cenozoic basement composed of geosynclinal rock associations. Sediment thickness in the basins attains 10-12 km. Rifting of the basement has resulted in the development of grabens controlled by northwest- and northeast-trending faults. Crustal thickness is 27-31 km. All the petroleum basins are related to rifts, which were associated with volcanic and magmatic activity and abnormally high temperature and pressures. Analysis of the data show that the main factors affecting deposition of the source rocks, their spatial distribution, and their effectiveness in generating hydrocarbons are; the geological age, regional tectonics, paleogeography, dominant kerogen type, and temperature. There are various types of oil and gas source rocks: Paleocene to lower Eocene claystones contain gas-prone kerogen type III (west Kamchatka); upper Eocene and Oligocene marine clays and siliceous clays contain oil-prone kerogen type II (west Kamchatka); upper Oligocene to lower Miocene siliceous shales (north Sakhalin and west Kamchatka) contain kerogen type II; lower and middle Miocene clays are gas prone (north Sakhalin and west Kamchatka); and middle Miocene marine clays contain oil-prone kerogen type II (north Sakhalin). The quantity of organic matter in the source rocks ranges from 0.6 to 4.2%, and the geothermal gradient ranges from 24 to 44[degrees]C per km. The main reservoirs are upper Oligocene-lower Miocene siliceous shales, Miocene-lower Pliocene sandstones, and upper Miocene deltaic sandstones. Oil and gas accumulations occur in anticlines and stratigraphic traps.

• OSTI ID: 6965295
• 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
RUSSIAN FEDERATION
PETROLEUM GEOLOGY
SANDSTONES
RESERVOIR ROCK
SEDIMENTARY BASINS
RIFT ZONES
SOURCE ROCKS
DEPOSITION
ANTICLINES
CENOZOIC ERA
CLAYS
GEOLOGIC FAULTS
GEOLOGIC STRATA
GEOLOGIC TRAPS
HYDROCARBONS
KAMCHATKA
KEROGEN
NATURAL GAS DEPOSITS
PALEOTEMPERATURE
PETROLEUM DEPOSITS
SHALES
SPATIAL DISTRIBUTION
TECTONICS
TERTIARY PERIOD
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
DISTRIBUTION
EASTERN EUROPE
EUROPE
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
MATERIALS
MATTER
MINERAL RESOURCES
ORGANIC COMPOUNDS
ORGANIC MATTER
RESOURCES
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration