琼东南盆地深水海底扇岩性圈闭成藏主控因素与勘探突破  

Main Controlling Factors of Accumulation and Exploration Breakthrough of Deep-Water Submarine Fan Lithologic Trap in the Qiongdongnan Basin

作　　者：尤丽 江汝锋 龚宇 徐守立 詹冶萍 郑飞 韩建辉[3] You Li;Jiang Rufeng;Gong Yu;Xu Shouli;Zhan Yeping;Zheng Fei;Han Jianhui(China National Off shore Oil Limited Corporation-Hainan,Haikou 570100,China;China National Offshore Oil Linited Corporation-Zhanjiang,Zhanjiang 524057,China;College of Energy,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570100 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057 [3]成都理工大学能源学院,四川成都610059

出　　处：《地球科学》2024年第2期749-758,共10页Earth Science

基　　金：中海石油(中国)有限公司科技项目“南海大中型天然气田形成条件、勘探潜力与突破方向”(No.KJZH-2021-0003-00)。

摘　　要：为研究琼东南盆地乐东-陵水凹陷中新统梅山组海底扇面临圈闭有效性与油气富集规律关键问题.综合海底扇沉积储层特征、圈闭形成与侧封条件、天然气运聚分析,明确梅山组海底扇岩性圈闭成藏主控因素.结果表明:(1)北物源海底扇主要分布于北斜坡区,凹陷带发育西部昆嵩隆起物源影响海底扇向凹推进远、储层物性较好;(2)发育对接水道泥岩、对接水道砂岩、岩性尖灭、断层侧封4种圈闭类型;(3)天然气为崖城组烃源岩供源的成熟-高熟天然气,具有“源内大型构造脊汇聚、沟源断裂/裂隙带垂向运移+砂岩侧向输导,有效圈闭富集”天然气成藏模式.针对凹陷带尖灭型和对接水道泥岩型圈闭分别部署钻探,均获得勘探突破,明确了下步拓展方向.To study the key problems restricting exploration are the traps effectiveness and gas enrichment rule.Based on the analysis of submarine fan reservoir characteristics,trap formation and lateral sealing conditions,natural gas migration and accumulation,the main controlling factors of deep-water submarine fan traps large-scale accumulation is researched.The results show that:(1)The submarine fan coming from Hainan uplift is mainly distributed in the northern slope area,and the submarine fan in the depression zone coming from the western Kunsong uplift develop large-scale advancing far into the sag,and the physical properties of the reservoir become better.(2)The types of trap lateral sealing mechanisms are establishing,including sealed by mudstone channel type,sealed by sandstone channel type,lithological pinch-out type and fault lateral sealing type.(3)The mature to high mature natural gas of Meishan submarine fan were supplied by source rock of Yacheng formation,Accumulation mode was large-scale structural ridge convergence in source rock,vertical and lateral migration system with fault or fracture and sandstone,and effective traps cotrolling accumulation.It has been made breakthroughs in lithological pinch-out type and sealed by mudstone channel type,and the next expansion direction is explicited.

关 键 词：琼东南盆地 乐东-陵水凹陷 深水 中新统 海底扇 圈闭条件 成藏主控因素 石油地质 

分 类 号：P618.13[天文地球—矿床学]