福山凹陷油气分布主控因素与源汇聚成藏模式  

Controlling factors of hydrocarbon distribution and source-migration-accumulation model in Fushan Depression

作　　者：齐振国 卢政环 姜福杰[1,2] 宋泽章 陈迪[1,2] 张宇琦 郭婧 房舟 王夕榕 刘一琳 QI Zhenguo;LU Zhenghuan;JIANG Fujie;SONG Zezhang;CHEN Di;ZHANG Yuqi;GUO Jing;FANG Zhou;WANG Xirong;LIU Yilin(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;South Petroleum Exploration and Development Co.,Ltd.,Guangzhou,Guangdong 510240,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中石油南方石油勘探开发有限责任公司,广东广州510240

出　　处：《中国矿业大学学报》2024年第4期777-792,共16页Journal of China University of Mining & Technology

基　　金：国家自然科学基金面上项目(41872128);中国石油天然气集团有限公司重大科研项目(2020-hnkt-020)。

摘　　要：福山凹陷是一个“小而肥”的富油气凹陷,是北部湾盆地和南海的油气成藏研究的借鉴和参考.福山凹陷油气分布具有“东气西油”、“深气浅油”、“中、东富集”的特点,但油气运聚主控因素及成藏模式尚不明确,制约着勘探方向的选择.本文在原油和烃源岩色谱-质谱分析、包裹体荧光观察及均一温度测定等实验基础上,结合盆地数值模拟开展了油气运聚成藏过程的分析,重点从源、汇、聚3个关键方面总结了油气分布的主控因素和规律.结果表明:受东部火成岩侵入的影响,白莲次凹流二段烃源岩成熟度明显高于其他地区,生烃能力更强;流一段、流三段砂体厚度大、物性好,断层在涠洲组沉积时期活动速率高,与砂体共同构成了油气输导体系,控制油气运汇的过程和方向,但断层泥质含量南北有较大差异,导致现今断层封闭能力不同;受源、汇、聚3个成藏关键要素控制,皇桐次凹油气主要向北(永安)、东南(红光、花场)、西(朝阳、美台)汇聚,白莲次凹油气主要向北(北部海域)、东南(金凤)、西南(花场)汇聚,与油气运移地化指标示踪结果一致.总体上具有“热促生烃、两凹供烃、断-砂输导、高位聚集、凹早凸晚、深浅分隔、复式成藏”的油气成藏模式.As one of the few onshore hydrocarbon-rich depressions in it,Fushan depression,lo-cated in the northern margin of the South China Sea,is an important breakthrough point for the study of oil and gas accumulation in the Beibuwan Basin and even the entire South China Sea.The distribution of hydrocarbon in Fushan depression is characterized by"east gas and west oil","deep gas and shallow oil",and"central and eastern enrichment".However,the dominant factors of the process of hydrocarbon migration and accumulation are still unclear,which restricts the selection of exploration.Therefore,based on the analysis of petroleum geo-logical characteristics,combined with basin simulation,the analysis of the process of hydro-carbon migration and accumulation has been carried out,and the main controlling factors of hydrocarbon distribution also have been summarized from three key aspects:"source-migration-accumulation".The results show that the maturity of source rock in E2l2 in Bailian Sub sag is obviously higher than that in other areas due to the intrusion of igneous rock;The sand bodies of E2l1 and E2l3 are thick and have good porosity and permeability.The faults Shale Gouge Ratio is quite different from north to south but they have the highest activity rate during the Oligocene epoch,faults and sand bodies form the hydrocarbon transport system,controlled the process and direction of hydrocarbon;Trap types and hydrocarbon migration and accumu-lation units control the location of hydrocarbon accumulation.The hydrocarbon in Huangtong Sub sag mainly converge to the north(Yong'an),southeast(Hongguang,Huachang),and west(Chaoyang,Meitai),while the hydrocarbon in Bailian Sub sag mainly converge to the north(northern sea area),southeast(Jinfeng),and southwest(Huachang),which is consist-ent with the geochemical indicators of hydrocarbon migration.On the whole,there is a hydro-carbon accumulation model of"Heat promoted hydrocarbon generation,hydrocarbon supply from two depressions,fault sand transport,subsag earlier,subconvex later,deep

关 键 词：源汇聚成藏特征 油气运聚 成藏模式 福山凹陷 

分 类 号：P618.13[天文地球—矿床学]