吐鲁番坳陷侏罗系地下水动力与油气成藏

doi:10.11743/ogg20080409

Abstract

Abstract:

The evolution of groundwater hydrodynamic field and origin of groundwater in sedimentary basins control the distribution patterns of chemical field of ground water.At the margin of a basin,groundwater desalinates due to the downward infiltration of atmospheric water,while in the central depression,groundwater desalinates due to discharge from mudstone under compaction.In contrast,groundwater concentrates in bypassing discharge area.During centrifugal and endoeentric flow processes,groundwater concentrates and gets salinized,forming a relative high salinity zone in the bypassing discharge area.Centrifugal flow from mudstone compaction serves as the main driving force of hydrocarbon migration in sedimentary basins and provides a favorable environment for large scale hydrocarbon accumulation during the bypassing and discharging of ground water.Moreover,it also can contribute some hydrocarbons to the lithologic,stratigraphic,fault traps located on the pathway of hydrocarbon migration.The advancement of endocentric flow may destroy the earlier hydrocarbon pools and also possibly lead to the formation of hydrodynamic traps at specific geologic conditions.

Key words: ground water, oilfield water, water chemistry, hydrodynamics, hydrocarbon accumulation dynamics, Turpan Depression

CLC Number:

TE122.1

Lou Zhanghua, Jin Aimin, Li Huaming, Zhang Huiting. Groundwater hydrodynamics and hydrocarbon accumulation in the Jurassic of the Turpan Depression[J]. Oil & Gas Geology, 2008, 29(4): 471-478,501.

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Groundwater hydrodynamics and hydrocarbon accumulation in the Jurassic of the Turpan Depression

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