Pore Structure Characterization and Micro-Heterogeneity of Carboniferous-Permian Organic-Rich Shalein Julu

doi:10.3969/j.issn.1006-6535.2020.04.006

Abstract

Abstract: In order to reveal the fractal performance and micro heterogeneity of riched organic in shale pores, X-ray diffraction, scanning electron microscopy and low temperature liquid nitrogen adsorption were used to qualitatively and quantitatively characterize the pore structure of riched organic in shale in Julu. The FHH model was used to calculate the fractal dimension of pores and discuss the influencing factors of micro heterogeneity. Research indicates that the shale mainly composed by clay minerals and quartz. The corresponding clay minerals are dominated by illite-smectite mixed layer, illite and chlorite. The pores mainly consist of organic pore, intergranular pore and micro fracture. The micro heterogeneity shows a difference for different pore size intervals, and there is a stronger micro heterogeneity in the range of 4.34～100.00 nm. The fractal dimension is positively and negatively related to clay minerals and brittle minerals respectively. The pore micro heterogeneity is also dependent on the structure and diagenesis. This research could provide certain theoretical reference for the shale gas exploration in Julu.

Key words: organic-rich shale, pore characterization, micro heterogeneity, Carboniferous-Permian, Julu

CLC Number:

TE122

Yao Shuanghong, Li Xueyuan, Li Peng, Wang Huijun, Chen Shangbin. Pore Structure Characterization and Micro-Heterogeneity of Carboniferous-Permian Organic-Rich Shalein Julu[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 41-48.

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