天然气工业2026，Vol.46Issue(7)：77-91,15.DOI:10.3787/j.issn.1000-0976.2026.07.007
中上扬子地区北缘二叠系孤峰组页岩气地质条件及勘探有利区优选
Geological conditions and favorable exploration zones of the Permian Gufeng Formation shale gas in the northern margin of the Middle-Upper Yangtze Region
摘要
Abstract
The Permian Gufeng Formation in the northern margin of the Middle-Upper Yangtze Region is a new area and formation for shale gas exploration,but its hydrocarbon accumulation patterns,enrichment controlling factors and exploration potential lack systematic research.Based on petrology,geochemistry,reservoir physical properties,gas-bearing properties and regional geological data,this paper systematically analyzes the geological conditions and exploration prospects of the Gufeng Formation shale gas in the northern margin of the Middle-Upper Yangtze Region.The following results are obtained.First,the Lower Member of the Gufeng Formation(siliceous shale segment)is the main shale gas enrichment interval,which is lithologically dominated by dark siliceous and carbonaceous shale with extremely high organic matter abundance(average TOC>11%).The organic matter is mainly of Type Ⅱ1,with moderate thermal maturity(Ro of 2.0%-2.6%),indicating an over-maturity stage for dry gas generation.Second,the reservoir space is dominated by organic pores,with an average matrix porosity of 8.48%,and the pore structure is mainly composed of micropores and mesopores.Third,the shale exhibits good gas-bearing properties(the average gas content of Well EJY2 is 4.52 m3/t),and the gas content is positively correlated with both TOC and porosity.Fourth,the thickness of organic-rich shale is significantly affected by paleogeomorphology and volcanic activities,resulting in a spatial distribution pattern of"two depressions and one uplift".The preservation conditions are controlled by the sealing capacity of roof and floor,the structural uplift and denudation,and the degree of fault development.In conclusion,the Lower Member of Gufeng Formation in the northern margin of Middle-Upper Yangtze Region exhibits superior geological conditions for shale gas accumulation and holds immense resource exploration potential.The favorable targets determined in this study can provide an important theoretical basis and practical support for the exploration deployment and production capacity replacement of shale gas in the new formations in the northern margin of the Middle-Upper Yangtze Region.关键词
中上扬子地区北缘/四川盆地/孤峰组/页岩气/地质条件/勘探潜力/有利区优选Key words
Northern margin of the Middle-Upper Yangtze Region/Sichuan Basin/Gufeng Fm/Shale gas/Geological conditions/Exploration potential/Optimization of favorable exploration targets分类
能源科技引用本文复制引用
李世臻,王昱荦,杨晓光,宋腾,徐秋晨,李飞,卢妍欣,沈斌,张小涛,邱振..中上扬子地区北缘二叠系孤峰组页岩气地质条件及勘探有利区优选[J].天然气工业,2026,46(7):77-91,15.基金项目
国家自然科学基金项目"鄂西海槽中上二叠统页岩沉积环境演变与富有机质页岩形成机制"(编号:42472210),中国地质调查局项目"全国页岩气重点调查区战略性矿产调查评价"(编号:DD20230043)、"滇黔桂地区页岩气地质调查与评价"(编号:DD20240048). （编号:42472210）
