特种油气藏2026，Vol.33Issue(3)：44-54,11.DOI:10.3969/j.issn.1006-6535.2026.03.005
川东北地区凉高山组页岩孔隙结构表征及优势储层形成机理
Pore structure characterization and formation mechanisms of favorable reservoir in the Lianggaoshan Formation shale,northeastern Sichuan Basin
摘要
Abstract
The Jurassic Lianggaoshan Formation in the northeastern Sichuan Basin contains considerable shale oil and gas resources.In recent years,several zones in the basin have yielded high-production oil and gas wells,demon-strating favorable exploration prospects.However,reserve growth and production enhancement remain challenging because of the complex lithofacies of fine-grained sedimentary rocks,relatively low organic matter abundance,and complex pore structures.Based on geochemical data,petrographic-mineralogical analyses,and multi-scale pore characterization results,this study examined the microscopic pore structure of shale in the first member of the Liang-gaoshan Formation and discusses the genesis of favorable reservoirs.The results show that six lithofacies types are mainly developed in the first member,including felsic,mixed and clay-rich shales under both low-organic-matter and high-organic-matter conditions(hereinafter referred to as low-organic matter and high-organic matter).A-mong them,high-organic-matter felsic shale and high-organic-matter clay-rich shale exhibit relatively high pro-portions of macropores and thus favorable reservoir properties.Lithofacies with higher content of brittle minerals have stronger resistance to compaction,which is conducive to the preservation of primary pores and to higher proportions of mesopores to macropores.Organic matter exerts a dual effect on the development of favorable reservoirs:an appro-priate organic matter content promotes pore development,whereas excessively high organic matter content fills pore space,thereby weakening rock compaction resistance and hindering the preservation of mesopores to macropores.Through analysis of the favorable lithofacies and the main controlling factors of pore structure in lacustrine shale res-ervoirs,it is concluded that the shale reservoir of the Lianggaoshan Formation in the northeastern Sichuan Basin is governed by a dual-threshold control model,and that an organic-matter-mineral composite pore system is critical to the formation of favorable shale reservoirs.This study provides support for sweet-spot prediction and subsequent ex-ploration deployment of shallow lacustrine shale oil and gas in the northeastern Sichuan Basin.关键词
陆相页岩/微观孔隙结构/控制因素/凉高山组/川东北地区Key words
lacustrine shale/microscopic pore structure/controlling factors/Lianggaoshan Formation/northeastern Sichuan Basin分类
能源科技引用本文复制引用
龚辰,陈守春,刘如昊,李世临,冯亮,张雷,王鑫锐,王仲旭..川东北地区凉高山组页岩孔隙结构表征及优势储层形成机理[J].特种油气藏,2026,33(3):44-54,11.基金项目
重庆市教委科学技术研究项目"四川盆地陆相页岩气富集机理和甜点智能评价体系研究"(KJZD-K202401503) （KJZD-K202401503）
重庆市级人才计划"包干制"项目"陆相页岩油气储层成因机制及甜点评价与预测方法体系研究"(cstc2024ycjh-bgzxm0064) （cstc2024ycjh-bgzxm0064）
西南油气田公司重大专项"川东地区侏罗系原油地质工程一体化技术研究"(2025D0ZD0104) （2025D0ZD0104）
重庆气矿科研项目"梁平—万州地区侏罗系凉高山组风险勘探目标研究"(K25-02) （K25-02）
