Geochemical features of two-phase hydrocarbon-pool formation in northern West Siberia
Gas-condensate pools that have oil rings occur widely in West Siberia, and much attention has been given to their formation and occurrence. Virtually all possible processes producing such pools have been found to occur here, from the single entry of saturated fluid into a trap followed by differentiation as the formation pressure falls to separate entry in different sequences for the oil and gas. The authors use the content of aromatic hydrocarbons as an index of the migration of oil and gas. Arene distributions in the light fractions of oils and condensates from the Neocomian beds in West Siberia are largely related to features of fluid generation and migration. Two-phase pools containing primary condensates occur in these beds, which is explained by a model based on different forms of fluid migration. They are controlled not only by fluid generation features (different ratios of liquid and gaseous hydrocarbon) but also by the relationships in time and space between the clayey and sandy rocks, which give rise to qualitative differences in consolidation and thus to differences in fluid migration in zones adjoining the reservoirs and in zones farther away.
- OSTI ID:
- 7053340
- Journal Information:
- Int. Geol. Rev.; (United States), Vol. 29:9; Other Information: Translated from Geologiya Nefti I Gaza; No. 6, 19-23(1987)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AROMATICS
CHEMICAL ANALYSIS
GAS CONDENSATE FIELDS
ORIGIN
GAS CONDENSATES
PETROLEUM
SIBERIA
CLAYS
CORRELATIONS
ENVIRONMENTAL TRANSPORT
GEOLOGIC MODELS
GEOLOGIC TRAPS
HYDROCARBONS
RESERVOIR PRESSURE
SANDSTONES
TIME DEPENDENCE
TWO-PHASE FLOW
ASIA
CONDENSATES
EASTERN EUROPE
ENERGY SOURCES
EUROPE
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
LIQUIDS
MASS TRANSFER
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS LIQUIDS
ORGANIC COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
USSR
020200* - Petroleum- Reserves
Geology
& Exploration
023000 - Petroleum- Properties & Composition