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--
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 77:9; ISSN 0149-1423; ISSN AABUD2
• Country of Publication: United States
• Language: English

Related Subjects

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