川东南地区二叠系茅口组一段非常规天然气富集高产主控因素  

Main factors controlling unconventional gas enrichment and high production in the first member of Permian Maokou Formation,southeastern Sichuan Basin,SW China

作　　者：何贵松 孙斌[1] 高玉巧[1,2] 张培先 张志萍[1] 蔡潇 夏威 HE Guisong;SUN Bin;GAO Yuqiao;ZHANG Peixian;ZHANG Zhiping;CAI Xiao;XIA Wei(Research Institute of Exploration and Development,East China Branch of SINOPEC,Nanjing 210019,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,Nanjing 210019,China)

机构地区：[1]中国石化华东油气分公司勘探开发研究院,南京210019 [2]页岩油气富集机理与高效开发全国重点实验室,南京210019

出　　处：《石油勘探与开发》2025年第2期362-373,共12页Petroleum Exploration and Development

基　　金：国家重大科技专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061);中国石化科技部项目“南川地区茅口组天然气富集主控因素研究与目标评价”(P21042-4)、“渝东南盆外常压页岩气富集模式与评价关键技术研究”(P25030)。

摘　　要：基于四川盆地东南部(简称川东南)南川地区钻井、测井、录井、实验和试气等资料,通过对二叠系茅口组一段(简称茅一段)生烃潜力、天然气成因、赋存状态、运移特征、保存条件、孔缝特征和成藏演化等方面开展系统研究,探讨茅一段泥灰岩组合非常规天然气富集高产主控因素和成藏模式。研究表明:①茅一段非常规天然气富集高产主要受控于3个因素:富碳组构控制生烃潜力、良好保存条件控制富集、天然裂缝控制产量规模;②茅一段富碳组构碳酸盐岩生气潜力大,具有自生自储特征,奠定了天然气成藏的物质基础;③天然气赋存状态以游离气为主,易发生横向运移,因此良好的保存条件是天然气富集的关键;正向构造更利于天然气汇聚成藏,单斜区茅一段自封闭及其顶底板封隔共同构筑良好的封存箱,也可滞留成藏;④天然裂缝为天然气主要储集空间和渗流通道,是控制产量的核心要素,裂缝越发育,越利于优质孔隙-裂缝型储层的形成以及天然气的富集成藏;⑤茅一段非常规天然气成藏模式为“自生自储、保存条件控富、裂缝控产”;⑥找准保存条件较好的裂缝发育区是勘探成功的关键,实施水平井分段酸化压裂是增产提效的重要手段。研究成果对深化川东南地区茅一段天然气富集规律认识、指导新类型非常规天然气高效勘探开发具有重要参考借鉴意义。Based on the data of drilling,logging,experiment and gas testing in the Nanchuan area,southeastern Sichuan Basin,the hydrocarbon generation potential,gas genesis,occurrence state,migration characteristics,preservation conditions,pore and fracture features and accumulation evolution of the first member of Permian Maokou Formation(Mao 1 Member)are systematically studied,and the main controlling factors of unconventional gas enrichment and high production in marlstone assemblage of Mao 1 Member are discussed.(1)The enrichment and high yield of unconventional natural gas in the Mao 1 Member are controlled by three factors:carbon-rich fabric controlling hydrocarbon generation potential,good preservation controlling enrichment,and natural fracture controlling production.(2)The carbonate rocks of Mao 1 Member with carbon rich fabric have significant gas potential,exhibiting characteristics of self-generation and self-storage,which lays the material foundation for natural gas accumulation.(3)The occurrence state of natural gas is mainly free gas,which is prone to lateral migration,and good storage conditions are the key to natural gas enrichment.Positive structure is more conducive to natural gas accumulation,and a good compartment is created jointly by the self-sealing property of the Mao 1 Member and its top and bottom sealing property in monoclinal area,which is favorable for gas accumulation by retention.(4)Natural fractures are the main reservoir space and flow channel,and the more developed natural fractures are,the more conducive to the formation of high-quality porous-fractured reservoirs and the accumulation of natural gas,which is the core of controlling production.(5)The accumulation model of unconventional natural gas is proposed as“self-generation and self-storage,preservation controlling richness,and fractures controlling production”.(6)Identifying fracture development areas with good preservation conditions is the key to successful exploration,and implementing horizontal well staged acidizing and fract

关 键 词：四川盆地 二叠系 茅口组 非常规天然气 富集高产主控因素 成藏模式 碳酸盐岩 川东南地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]