沉积盆地深部流体的地球化学特征及油气成藏效应初探

金之钧; 张刘平; 杨雷; 胡文瑄

Volume 27 Issue 6

Jun. 2002

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Article Navigation > Earth Science > 2002 > 27(6): 659-665

JIN Zhi-jun, ZHANG Liu-ping, YANG Lei, HU Wen-xuan, 2002. Primary Study of Geochemical Features of Deep Fluids and Their Effectiveness on Oil/Gas Reservoir Formation in Sedimental Basins. Earth Science, 27(6): 659-665.

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Primary Study of Geochemical Features of Deep Fluids and Their Effectiveness on Oil/Gas Reservoir Formation in Sedimental Basins

JIN Zhi-jun^{1, 2},
ZHANG Liu-ping^{1, 2},
YANG Lei^{1, 2},
HU Wen-xuan³

1.
Basin & Reservoir Research Center, University of Petroleum, Beijing 102249, China
2.
Key Laboratory for Hydrocarbon Accumulation, Ministry of Education, Beijing 102249, China
3.
Department of Earth Sciences, Nanjing University, Nanjing 210093, China

Received Date: 2002-08-20
Publish Date: 2002-11-25

Abstract

Abstract

This paper focuses on geochemical features of deep fluids (mainly mantle-derived fluid) and their effect on oil/gas reservoirs formation in Dongiyng sag, Jiyang depression and Central Tarim basin, by using isotopic geochemistry, organic geochemistry and thermodynamics. It is found that both CO₂- (H₂O+CO₂) and H- (H₂O+CH₄+H₂) rich fluids from the mantle are injected into Dongying sag and CO₂-rich fluid in Central Tarim basin. The quantitative study of heat transformation of deep fluid ascendance shows that the mantle is an effective heat carrier. The evidence of thermal anomalies in Dongying sag and Central Tarim basin proves the existence of heat effect of deep fluids. Hydrocarbon generation from kerogen degragation not only needs heat but also actually requires hydrogen. It is known that mantle-derived, hydrogen-rich fluid may increase hydrocarbon production when the fluid meets source rocks in basins. Experimental hydrogenation simulation shows that hydrogen addition increases the production greatly. For sapropelic kerogen, the effect of hydrogenation becomes evident after fastigium of hydrocarbon generation and the production can increase up to 147%. While for humic kerogen, hydrocarbon production by hydrogenation can be increased at every stage of thermal evolution. It is found that deep fluids increase production rate of the source rocks in Dongying sag and Central Tarim basin. Hence it can be concluded that the mantle-derived fluids have great influence on hydrocarbon generation from source rocks in both energy and substance supply.
- mantle-derived fluid,
- oil/gas reservoirs formation,
- isotopic geochemistry,
- thermomechanics,
- experimental hydrogenation simulation

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References(22)

References

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