大庆石油地质与开发2026，Vol.45Issue(1)：19-26,8.DOI:10.19597/J.ISSN.1000-3754.202406020
四川盆地合川-潼南地区雷口坡组一段2亚段泥质白云岩非常规气藏形成条件及勘探方向
Hydrocarbon accumulation conditions and exploration direction of argillaceous-dolomite unconventional gas reservoirs in the 2nd sub-member of the first member of Leikoupo Formation in Hechuan-Tongnan area of Sichuan Basin
摘要
Abstract
Well Tongshen16 in Hechuan-Tongnan area of Sichuan Basin has achieved high commercial-gas produc-tion in the 2nd sub-member of the first member of Leikoupo Formation,demonstrating good exploration prospects.Argillaceous dolomite is a newly discovered hydrocarbon-generating lithology in Sichuan Basin.However,its hydro-carbon source,reservoir and hydrocarbon accumulation conditions are not clear,and these key issues restrict the exploration and deployment of argillaceous dolomite.Taking argillaceous dolomite in Leikoupo Formation of Sichuan Basin as the systematic research object,studies on hydrocarbon accumulation conditions such as source rocks and reservoirs are carried out through geochemical analysis such as total organic carbon content(w(TOC))and uncon-ventional reservoir analysis methods such as scanning electron microscopy,high-pressure mercury injection and nu-clear magnetic resonance.The results show that natural gas in the 2nd sub-member of the first member of Leikoupo-Formation of Well Tongshen16 comes from source rocks of Leikoupo Formation itself,and oil and gas accumulate in short distance,with self-generated and self-preserved characteristics.Argillaceous dolomite in the 2nd sub-member of the first member of Leikoupo Formation has certain hydrocarbon generating capacity,which is TypeⅡ2 kerogen with high organic matter maturity.Argillaceous dolomite reservoirsare developed in the 2nd sub-member of the first member of LeikoupoFormation,and the reservoir types are mainly micropores-micro-fractures.Natural gas in Leik-oupo Formation enters argillaceous-dolomite reservoir through conduit systems such as small faults and fractures to accumulate and form reservoirs,and is sealed by plastic gypsum at the top and bottom,which is the important rea-son for high production of Well Tongshen16.Central Hechuan-Tongnan area is the key zone for further exploration.关键词
四川盆地/合川‒潼南地区/雷口坡组/泥质白云岩/海相非常规油气Key words
Sichuan Basin/Hechuan-Tongnan area/Leikoupo Formation/argillaceous dolomite/marine uncon-ventional petroleum分类
能源科技引用本文复制引用
李强,董忠良,白雪晶,师江波,辛勇光,王轲,江青春,王显东,田小彬,鞠林波,韦裕琳..四川盆地合川-潼南地区雷口坡组一段2亚段泥质白云岩非常规气藏形成条件及勘探方向[J].大庆石油地质与开发,2026,45(1):19-26,8.基金项目
新型油气勘探开发国家科技重大专项课题"志留系-中三叠统常规-非常规油气有序分布规律及增储区带评选"(2025ZD1400403). （2025ZD1400403）
