川东南龙马溪组页岩孔隙分形特征

doi:10.3969/j.issn.1673-8926.2015.04.005

Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (4): 32-39.doi: 10.3969/j.issn.1673-8926.2015.04.005

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Fractal characteristics of shale pores of Longmaxi Formation in southeast Sichuan Basin

Xu Yong^1，2， Lu Chengfu¹， Chen Guojun¹， Zhong Jiaai^1，2， Yang Wei^1，2， Xue Lianhua¹

1. Key Laboratory of Petroleum Resources ， Gansu Province/Key Laboratory of Petroleum Resources Research ，Institute of Geology and Geophysics ， Chinese Academy of Sciences ， Lanzhou 730000 ， China ； 2. University of Chinese Academy of Sciences ， Beijing 100049 ， China

Online:2015-07-20 Published:2015-07-20

Abstract

Abstract:

Based on fractal theory and methods and the nitrogen adsorption results of shale samples from the Lower Silurian Longmaxi Formation in southeast Sichuan Basin, the fractal characteristics of pores were studied, the fractal dimension was calculated by using the fractal Frenkel-Halsey-Hill（FHH） model, and the relations of fractal dimension with pore structure, organic carbon content and shale composition were discussed. The results show that mesopores are the main pores in shale, and mainly consist of ink-bottle-like and slit-shaped pore. The fractal dimension of shale samples is between 2.629 2 and 2.898 0, which reflects the complexity and heterogeneity of the shale porosity. The smaller the average pore diameter is, the more the micropores are, the more complex the pore structure is, the more irregular the specific shale face is, the larger the specific surface face is, and the higher the fractal dimension is. Organic carbon content and the degree of micropore development impact a lot on the fractal dimension.

Key words: shale gas, stress sensitivity, adsorption, multi-scale flow, Knudsen number

Xu Yong， Lu Chengfu， Chen Guojun， Zhong Jiaai， Yang Wei， Xue Lianhua. Fractal characteristics of shale pores of Longmaxi Formation in southeast Sichuan Basin[J].Lithologic Reservoirs, 2015, 27(4): 32-39.

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