Pore Structure Characteristics and Main Controlling Factors of Qiongzhusi Formation Shales of Lower Cambrian, Southern Sichuan Basin

doi:10.11885/j.issn.1674-5086.2024.12.05.04

Abstract

Abstract: To assess the characteristics and differences of the two types of shale reservoirs within the Qiongzhusi Formation of southern Sichuan Basin, based on the systematic coring data from drilling, a comprehensive application of experimental methods such as X-ray diffraction, argon ion polishing scanning electron microscopy, high-pressure mercury intrusion, low-temperature N$_2$ and CO$_2$ adsorption was employed to conduct research on the TOC content, mineral composition, microscopic pore types, pore structure characteristics, and their influencing factors of the two types of shale reservoirs. The research results indicate that both types of shale reservoirs develop multiple types of microscopic pores, and the overall pore type is mainly inorganic pores. The proportion of organic pores in the organic-rich shale is higher than that in the shale with organic matter. The porosity of the organic-bearing shale (TOC < 1%) ranges from 4.78% to 6.02% (average 5.22%), and the pore size distribution of the reservoir is mainly 20$\sim$100 nm, with macropores being the main reservoir space (average 70.10%). The porosity of the organic-rich shale (TOC $\geqslant$ 1%) ranges from 3.88% to 7.06% (average 5.53%), and the pore size distribution of the reservoir is mainly 1$\sim$50 nm, with mesopores being the main reservoir space (average 81.81%). The specific surface area and volume of micropores in the organic-bearing shale have a positive correlation with the TOC content, while the specific surface area and volume of micropores and mesopores in the organic-rich shale have a positive correlation with the TOC content. The relationship between the two types of shale reservoirs and the mineral composition is complex. The supporting structure constructed by quartz and feldspar lays the foundation of the original inorganic pores, and TOC, clay minerals, and post-diagenetic minerals filling the intergranular pores change the pore structure, and the increasing content of TOC can improve percentage of organic pores.

Key words: shale reservoir, pore type, pore structures, the Qiongzhusi Formation, southern Sichuan Basin

CLC Number:

TE121

LUO Sicong, ZHANG Nanxi, WANG Baobao, ZHOU Hua, WANG Tong. Pore Structure Characteristics and Main Controlling Factors of Qiongzhusi Formation Shales of Lower Cambrian, Southern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(6): 91-106.

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