异常压力环境下流体活动及其油气运移主通道分析

解习农; 刘晓峰; 赵士宝; 姜涛

Volume 29 Issue 5

Sep. 2004

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JIE Xi-nong, LIU Xiao-feng, ZHAO Shi-bao, JIANG Tao, 2004. Fluid Flow and Hydrocarbon Migration Pathways in Abnormally Pressured Environments. Earth Science, 29(5): 589-595.

Citation:

JIE Xi-nong, LIU Xiao-feng, ZHAO Shi-bao, JIANG Tao, 2004. Fluid Flow and Hydrocarbon Migration Pathways in Abnormally Pressured Environments. Earth Science, 29(5): 589-595.

JIE Xi-nong, LIU Xiao-feng, ZHAO Shi-bao, JIANG Tao, 2004. Fluid Flow and Hydrocarbon Migration Pathways in Abnormally Pressured Environments. Earth Science, 29(5): 589-595.

Citation:

JIE Xi-nong, LIU Xiao-feng, ZHAO Shi-bao, JIANG Tao, 2004. Fluid Flow and Hydrocarbon Migration Pathways in Abnormally Pressured Environments. Earth Science, 29(5): 589-595.

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Fluid Flow and Hydrocarbon Migration Pathways in Abnormally Pressured Environments

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Fourth Institute of Geological and Mineral Exploration of Inner Mongolia, Jining 012000, China

Received Date: 2004-05-12
Publish Date: 2004-09-25

Abstract

Abstract

Hydrocarbon generation, migration and accumulation are closely related to activity of the basin fluid. Fluid flow in abnormally pressured environments shows different hydrodynamic processes as a result of associated distinct models of hydrocarbon accumulation. Two kinds of fluid flow systems have been classified in abnormally pressured environments including overpressure and underpressure, i.e. semi-opened and closed systems. In the former, opening of seal beds result in episodic fluid expulsion; but in the latter, thermal convection is dominant in anomalous pressured system. The opening mechanisms of seal beds can be grouped into three kinds of patterns, hydrofracturing, faulting and combination action of both faulting and pressuring. Opening of seal beds constitutes main pathways of hydrocarbon from abnormally pressured system. These fluids flowing from deep overpressured strata to seafloor have been identified using different geophysical data, which are imaged as gas blow-out, pockmark, chimney, fluid diapir, and so on. Some resided remarks or anomalous phenomena recorded in depositional rocks can be used to identify the active processes of fluid, such as fluid inclusions, geochemical features of formation water, anomaly in organic matters and diagenetic processes. At the same time, quantitative modeling can be used to present the dynamic processes of fluid flow. These results can constrain the realm of main migration pathways of fluid flow and hydrocarbon, and provide the useful information for hydrocarbon exploration in abnormally pressured environments.
- abnormal pressure,
- episodic fluid flow,
- thermal convection,
- gas chimney,
- hydrocarbon migration

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References(45)

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