四川盆地天府气田沙溪庙组中浅层天然气成藏特征与差异富集规律  

Reservoir-forming characteristics and differential enrichment law of middle-shallow natural gas of Shaximiao Formation in Tianfu gas field in Sichuan Basin

作　　者：王小娟[1] 潘珂[1] 曹正林[1] 文龙[1] 刘景东[2] 关旭[1] 庞小婷 杨曦冉 WANG Xiaojuan;PAN Ke;CAO Zhenglin;WEN Long;LIU Jingdong;GUAN Xu;PANG Xiaoting;YANG Xiran(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu 610051,China;School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610051 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《中国石油大学学报（自然科学版）》2024年第6期25-36,共12页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油西南油气田公司重大科技专项(2022ZD01-01)。

摘　　要：以四川盆地天府气田沙溪庙组为例,通过天然气成因来源、输导体系和运聚过程等分析,建立天然气成藏模式,揭示天然气运聚机制和富集高产主控因素。结果表明:天府气田沙溪庙组天然气整体以须家河组来源的煤型气为主,东北部存在下侏罗统来源的油型气;各规模气源断层输导依次起到“主导、补充、调节”作用,建立它源逆断层输导强运聚、它源逆断层输导中等运聚、混源正逆断层输导中等运聚、自源正断层输导弱运聚4类成藏模式;断源配置、断砂配置、关键期古构造、河道储层差异是控制天然气运聚和差异富集的主控因素。研究成果有利于深化四川盆地中浅层天然气成藏与富集规律认识,对类似地区中浅层天然气的勘探开发具有借鉴意义。Using the Shaximiao Formation of the Tianfu gas field in Sichuan Basin as an example,this study establishes a natural gas accumulation model by analyzing the origin of natural gas,transport system,and the processes of migration and accumulation.It reveals the mechanisms of natural gas migration and accumulation,along with the key controlling factors for high yields and enrichment.The results show that the natural gas in the Shaximiao Formation is primarily coal-derived gas from the Xujiahe Formation,with oil-type gas from the Lower Jurassic sources present in the northeastern area.The transport of oil and gas by faults is characterized by"dominance,supplementation,and regulation".Four gas migration and accumulation modes were identified:strong gas migration and accumulation with external sources via reverse faults,moderate gas migration and accumulation with external sources via reverse faults,moderate gas migration and accumulation with mixed sources via normal and reverse faults,weak gas migration and accumulation with self-sourced gas via normal faults.The relationship between fault-source configurations,fault-sand configurations,paleotectonic structures during critical periods,and variations in channel reservoirs are the main factors controlling natural gas migration,accumulation and differential enrichment.These findings deepen the understanding of the accumulation and enrichment of middle-shallow natural gas in Sichuan Basin and provide valuable insights for the exploration and development of middle-shallow natural gas in similar areas.

关 键 词：中浅层天然气 天然气成因来源 天然气运移 成藏模式 富集主控因素 四川盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]