Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 67-75.doi: 10.3969/j.issn.1673-8926.2016.05.008

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Controlling factors for shale gas enrichment of the Lower Jurassic Dongyuemiao member in the northern Sichuan Basin

Gao Jian1，2， Lin Liangbiao1，2， Ren Tianlong3， Huang Qichen1，2， Yu Yu1，2   

  1. （1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China； 2. Institute of Sedimentary Geology， Chengdu University of Technology， Chengdu 610059， China； 3. Shandong Geological Surveying Institute， Jinan 250013， China）
  • Online:2016-09-29 Published:2016-09-29

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Abstract:

The Lower Jurassic shale is good for gas accumulation in northern Sichuan Basin, and its exploration has succeeded in recent years. Compared to Daanzhai member of Ziliujing Formation, the research of Dongyuemiao member of Ziliujing Formation is limited, so the potential of shale gas resources need to be further studied. The data of organic geochemistry, X diffraction and scanning electron microscopy, combined with conventional helium test and isothermal adsorption, were applied to study the geologic characteristics of organic?rich shale of Dongyuemiao member. The results show that the kerogen type is mainly Ⅲ type, the abundance of organic matter is high and its thermal evolution is in the middle mature stage. The shale composition is mainly quartz and clay minerals which are mainly composed of illite/smectite, illite, kaolinite and chlorite. The shale reservoir is composed of inorganic pores and fractures. The porosity and permeability of shale are 3.1% and 0.751 mD in average respectively, but the permeability of most of the samples is less than 0.1 mD. The porosity is correlated positively with permeability. The adsorption ability of shale is relatively strong, which is favorable for shale gas enrichment, meanwhile, it is difficult for desorption of shale gas. It is considered that Dongyuemiao member is relatively good for shale gas accumulation, and the sedimentary facies, lithology assemblage, fracture, and isolation layer are key factors for the shale gas enrichment.

Key words: shale gas, organic geochemistry, Xujiahe Formation, foreland basin

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