四川盆地东北部下侏罗统自流井组陆相页岩储层孔隙特征及形成控制因素

doi:10.11743/ogg20210112

Abstract

Abstract:

The development characteristics and mechanisms of pores in the organic-rich continental shale in the Ziliujing Formation of the Yuanba and Fuling areas, northeastern Sichuan Basin, were studied based on an integration of thin-section observation, whole-rock x-ray diffraction and organic matter petrological analyses with measurements obtained jointly through high-pressure mercury intrusion and adsorption experiments, and argon ion polishing-scanning electron microscopy and physical property tests.As a result, the structure, type and storage capacity of the pores as well as the factors controlling the pore growth were revealed.It shows that both the Dongyuemiao Member shale in the Fuling area of eastern Sichuan Basin and Da'anzhai Member shale in the Yuanba area of northern Sichuan Basin have high reservoir capacity with an average porosity higher than 4%.Pores in the shales are mostly inorganic mineral pores, followed by organic-matter pores and some local micro-cracks.The inorganic mineral pores show signs of strong influence of clay mineral and compaction intensity.And the organic-matter pores were probably conditioned by the composition type of organic matter as they are found to be abundant in solid asphalt, but rare in most vitrinites.The Dongyuemiao and Da'anzhai Members of the Fuling area in eastern Sichuan Basin and the Da'anzhai Member of the Yuanba area in northern Sichuan Basin contain both types of pores, while the Dongyuemiao Member of the Yuanba area is rich in inorganic mineral pores only.

Key words: inorganic mineral pore, organic-matter pore, pore type, continental shale gas, shale reservoir, Ziliujing Formation, the Jurassic, Sichuan Basin

CLC Number:

TE122.2

Zhongbao Liu, Zongquan Hu, Guangxiang Liu, Zhujiang Liu, Haotian Liu, Jingyu Hao, Pengwei Wang, Peng Li. Pore characteristics and controlling factors of continental shale reservoirs in the Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(1): 136-145.

Figures/Tables 8

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Pore characteristics and controlling factors of continental shale reservoirs in the Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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