沉积盆地超压系统演化与深层油气成藏条件

郝芳; 邹华耀; 倪建华; 曾治平; 王敏芳

Volume 27 Issue 5

Sep. 2002

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Article Navigation > Earth Science > 2002 > 27(5): 610-615

HAO Fang, ZOU Hua-yao, NI Jian-hua, CENG Zhi-ping, WANG Min-fang, 2002. Evolution of Overpressured Systems in Sedimentary Basins and Conditions for Deep Oil/Gas Accumulation. Earth Science, 27(5): 610-615.

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Evolution of Overpressured Systems in Sedimentary Basins and Conditions for Deep Oil/Gas Accumulation

Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2002-02-28
Publish Date: 2002-09-25

Abstract

Abstract

Accumulation at late stages has been confirmed to be an important characteristics of most large and medium sized oil/gas reservoirs in China. From the viewpoint of late accumulation, the existence of active source rocks and reservoir rocks with relatively high porosity and permeability in the deep part of the basin, and favorite pressure distribution between reservoir rocks and seals were required for the accumulation of deep oil/gas reservoirs. In overpressured basins, source rocks that would have reached the metagenetic stage without retardation in normally pressured basins have been kept within the zones favorable for hydrocarbon generation and expulsion due to overpressure retardation, which provides good hydrocarbon sources for oil/gas accumulations in the deep intervals. The weak mechanical compaction due to low effective stress, and weak chemical diagenesis due to closed or semi closed fluid systems in overpressured conditions lead to the preservation of relatively high porosities and permeabilities for the deeply buried sandstones. However, because of the natural hydraulic fracturing of strata and cross formation migration of fluids including oil and gas, effective energy distribution between reservoir rocks and seals are required for the accumulation and preservation of deep oil and gas accumulation in overpressured conditions.
- sedimentary basin,
- overpressured system,
- deep oil and gas,
- accumulation condition

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References

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