Tight Oil Exploration of Chang 9 Turbidity in Zhouchang Area of Ordos Basin

Abstract

Abstract: Turbidity of Chang 9 layer of Yanchang Formation in Zhouchang area is brought under study for the purpose to discuss the significance of regional tight oil exploration in the aspects of oil source conditions, reservoir characteristics, reservoir assemblage and expulsion pressure of hydrocarbon. The study indicates that turbidity in Zhouchang area is mainly feldspathic sandstone with development of erosion surfaces and synsedimentary deformation structures in Bouma sequence. The porosity of reservoir is 5.18 percent on average while the permeability is 0.17mD on average. It is a tight reservoir. Based on the analysis and testing, shale in Lijiapan is high-quality source rock that serves as the sufficient source for tight oil of Chang 9 layer. Meanwhile it is also an effective regional cap rock. The good reservoir-cap assemblage of turbidity sand body and Lijiapan shale structure has a certain potential for tight oil exploration. Excessive pressure from hydrocarbon pressurization in source rock of Chang 9 layer is the force to make crude oil migrate downward. It is necessary to determine the favorable tight oil exploration targets on the basis of combining hydrocarbon expulsion pressure with the good reservoir-cap assemblage.

Ding Chao, Wang Jiawei. Tight Oil Exploration of Chang 9 Turbidity in Zhouchang Area of Ordos Basin[J]. China Petroleum Exploration, 2015, 20(4): 30-36.

References

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