成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：674-688,15.DOI:10.12474/cdlgzrkx.2024041501
川东南地区志留系石牛栏组海相页岩储层孔隙结构特征及油气地质意义
Characteristics of shale pore structure and its geological oil and gas significance in the Shiniulan Formation,southeast Sichuan Basin
摘要
Abstract
The marine shale reservoir of the Silurian Shiniulan Formation in the southeastern Sichuan Basin has considerable potential for oil and gas exploration in Sichuan Basin,due to the presence of a near-surface gas layer.However,the pore structure of the reservoir has rarely been studied.In this work,the pore structure characteristics of the Shiniulan Formation shale are exampled using whole rock X-ray diffraction,argon ion polishing scanning electron microscopy,low-temperature nitrogen adsorption,and nuclear magnetic resonance analysis.The research results show that:(1)The pore types of the Shiniulan shale reservoir are mainly organic and inorganic,with a few micro-fractures,and the pore morphology consists mainly of slit pores,ink-bottle pores;and wedge pores.(2)The Brunauer-Emmett-Teller specific surface area of the reservoir is 5.17～16.67 m2/g,and the pore volume is(2.55～52.59)×10-3 cm3/g,which is mainly controlled by micropores and mesopores.(3)The total organic matter content(TOC)is the main factor controlling the pore structure of the Shiniulan Formation shale reservoir.Mineral content indirectly controls the pore structure of the reservoir by affecting the enrichment of organic matter.The development of clay minerals is conducive to the adsorption of organic matter,and excessive input of brittle minerals will dilute the enrichment of organic matter.(4)The advantageous lithofacies type is clay shale,and its pore morphology and pore size distribution are similar to the Wufeng-Longmaxi Formation and Dalong Formation shale reservoirs,implying its good exploration potential.The area with high TOC content is a key exploration area for shale gas in the near future.These research results provide reference for the evaluation of shale gas exploration potential in the Shiniulan Formation in the southeastern Sichuan Basin.关键词
川东南地区/石牛栏组/有机质孔/孔隙结构/分形特征Key words
southeast Sichuan Basin/Shiniulan Formation/organic matter pores/pore structure/fractal characteristics分类
能源科技引用本文复制引用
WANG Bin,GUO Min,SHI Zejin,WANG Yong,JIN Xin,ZENG Yao,MA Xiaogang,DENG Haoshuang..川东南地区志留系石牛栏组海相页岩储层孔隙结构特征及油气地质意义[J].成都理工大学学报（自然科学版）,2025,52(4):674-688,15.基金项目
国家重点研发计划(2016YFC0600604) （2016YFC0600604）
国家自然科学基金(4160030199). （4160030199）
