DIFFERENCE IN FAULT DEVELOPMENT AND ITS CONTROLLING ON OIL AND GAS ACCUMULATION IN MAICHEN SAG, BEIBUWAN BASIN

HU Ai-yu; CHEN Wei; YU Wen-quan; TONG Heng-mao

Volume 21 Issue 3

Sep. 2015

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Article Navigation > Journal of Geomechanics > 2015 > 21(3): 318-329

HU Ai-yu, CHEN Wei, YU Wen-quan, et al., 2015. DIFFERENCE IN FAULT DEVELOPMENT AND ITS CONTROLLING ON OIL AND GAS ACCUMULATION IN MAICHEN SAG, BEIBUWAN BASIN. Journal of Geomechanics, 21 (3): 318-329.

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DIFFERENCE IN FAULT DEVELOPMENT AND ITS CONTROLLING ON OIL AND GAS ACCUMULATION IN MAICHEN SAG, BEIBUWAN BASIN

1.
Institute of exploration and development, Jiangsu Branch of SINOPEC, Yangzhou 225009, Jiangsu, China
2.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China

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Abstract

Abstract

Using the seismic and drilling data, the development, evolution and origin of the fault system in the east of Maichen Sag were analyzed, and the influence of fault on oil and gas accumulation were discussed in this paper. The results show that the fault combinations and activity characteristics have obvious differences in different regions of Maichen Sag; There are six types of tectonic styles developed, including domino structure, stepped fault, complicated "Y" shaped structure (collapse structure), listric-fan structure, drag structure, and superposed fault; And there are four types of fault activities, including continuous activity, early-activity, midterm-activity and late-activity. The fault system in Maichen Sag are developed in the superposition of multi-periodic rifting with different extension directions (NW-SE extension during E₁ch-E₂l, NS extension during E₃w) under the pre-existing tectonic conditions. The differences of structural styles and fault activities are caused by different distribution and activity of pre-existing structures. The fault system control not only the thickness and distribution of source rock but also the oil and gas migration which impact the oil-gas accumulation model and lead to different oil and gas distribution in Maichen Sag.
- Maichen Sag,
- fault system,
- structural style,
- oil and gas migration,
- oil and gas accumulation

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References

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