四川盆地二叠系—中三叠统海相非常规资源类型及有利勘探方向  

Types of Unconventional Marine Resources and Favorable Exploration Directions in the Permian Middle Triassic of the Sichuan Basin

作　　者：谢武仁[1] 文龙[2] 汪泽成[1] 郝毅[1] 辛勇光[1] 武赛军[1] 李文正 姚倩颖 马石玉[1] 陈娅娜[1] XIE Wuren;WEN Long;WANG Zecheng;HAO Yi;XIN Yongguang;WU Saijun;LI Wenzheng;YAO Qianying;MA Shiyu;CHENG Yana(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Research Institute of Exploration and Development,PetroChina Southwest Oil&Gasfield Company,Chengdu 610051,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田公司勘探开发研究院,四川成都610051

出　　处：《天然气地球科学》2024年第6期961-971,共11页Natural Gas Geoscience

基　　金：中国石油重大科技项目“不同类型大气田(区)成藏主控因素及领域评价”(编号:2021DJ0605)资助。

摘　　要：四川盆地二叠系—中三叠统发育常规—非常规2类资源,是寻找规模储量的重要层系。最新钻井充探1井雷口坡组海相泥灰岩和大页1H井吴家坪组获重大勘探发现,初步揭示二叠系—中三叠统“源储一体”非常规油气资源潜力大。通过老井复查、岩心观察和油气地球化学特征分析,明确了二叠系—中三叠统海相非常规资源类型,探讨了油气成藏条件,指出了不同资源类型有利分布区。结果表明:①二叠系—中三叠统发育海相泥灰岩(雷三2亚段、茅一段)、吴家坪组/龙潭组页岩、龙潭组煤岩等非常规类型;②二叠系—中三叠统非常规具有源储一体,源内成藏或近源成藏特征,油气成藏顶底板条件较好,大面积富集;③二叠系—中三叠统海相泥灰岩、页岩及海陆过渡相煤系大面积分布,成藏条件良好,埋藏适中,资源潜力大,具备规模勘探潜力。川中地区西充—仪陇的雷三2亚段泥灰岩、泸州古隆起东斜坡的茅一段泥灰岩、川东北吴家坪组的页岩和川中高石梯—磨溪、川南长宁地区的煤岩均是下一步有利勘探区域,值得加大探索,实现新的突破。The Permian Middle Triassic in the Sichuan Basin develop two types of resources,conventional and unconventional,which are important layers for searching for large-scale reserves.The latest drilling and exploration of the Leikoupo Formation marine mudstone in Well CT1 and the Wujiaping Formation in Well DY1H have made significant exploration discoveries,preliminarily revealing the great potential of unconventional oil and gas resources in the Permian and Triassic"source reservoir integration".Through the review of old wells,core observation,and analysis of oil and gas geochemical characteristics,the types of unconventional marine resources in the Permian Middle Triassic were identified,the conditions for oil and gas accumulation were explored,and favorable distribution areas for different resource types were pointed out.The results indicate that:①The Permian and Triassic developed unconventional types such as marine mudstone(the 2rd interval of the 3th member of Leikoupo[Lei-32]and 1st member of Maokou Formation[Mao-1]),shale from Wujiaping Formation/Longtan Formation,and coal and gas from Longtan Formation;②The Permian system is unconventional in that it has the characteristics of active reservoir integration,in source or near source reservoir formation,good top and bottom conditions of oil and gas reservoir formation,and large area enrichment;③The Permian and Triassic marine mudstone,shale,and marine land transitional coal measures are widely distributed,with good reservoir formation conditions,moderate burial,high resource potential,possessing large-scale exploration potential.The Lei-32 of Xichong-Yilong in central Sichuan,the Mao-1 of the eastern slope of Luzhou ancient uplift,the shale of the Wujiaping Formation in northeastern Sichuan,and the coal rocks in the Gaoshiti-Moxi and southern Changning areas in central Sichuan are all favorable exploration areas for further exploration,which are worth further exploration and achieving new breakthroughs.

关 键 词：四川盆地 非常规 泥灰岩 页岩 源储一体 

分 类 号：TE121.13[石油与天然气工程—油气勘探]