摘要
为探究南海北部湾盆地涠西南凹陷涠洲组碎屑岩成岩作用及优质储层发育规律,以涠洲X油田涠洲组三段为例,通过薄片鉴定、扫描电镜分析、阴极发光和成岩数值模拟等方法,深入分析成岩作用类型及机理、成岩演化序列、成岩相划分,并开展优质储层主控因素分析及优选。结果表明:研究区涠三段储层压实作用中等,以点-线或线接触为主;胶结作用以不同类型黏土矿物为主,总体处于中成岩A_(1)^(2)-A_(2)^(1)微期有利阶段;研究区经历了酸性和碱性溶蚀作用,以典型高岭石和绿泥石酸-碱性溶蚀作用产物最为突出;分流河道A_(1)^(1)微期高岭石和分流河道A_(1)^(2)微期高岭石沉积-成岩相是研究区优质储层发育相带。
To explore the diagenesis and development pattern of quality reservoirs in the Weizhou Formation in the Weixi'nan Sag,Beibu Gulf Basin,South China Sea,taking the Third Member of the Oligocene Weizhou Formation in the Weizhou X Oilfield as an example,the types and mechanisms of diagenesis,the sequence of diagenetic evolution,and the division and distribution of diagenetic facies were analyzed in depth through techniques such as thin section microscopy identification,scanning electron microscopy,cathodoluminescence,and numerical simulation of diagenesis.The main controlling factors and selection of quality reservoirs were determined.Results show that the compaction effect of the reservoir in the Third Member is moderate showing mainly point-line or line-line contact.Different types of clay minerals were involved in the cementation process,which occurred in mainly the favorable stage of A_(1)^(2)-A_(2)^(1) micro-facies of diagenesis.The research area has experienced acidic and then alkaline dissolution and the most prominent products are the acid-alkaline dissolution products of typical kaolinite and chlorite.The sedimentary diagenetic micro-facies of A_(1)^(2) in distributary channel are the favorite zones of development of quality reservoirs in the study area.
作者
朱金起
张乔良
杨朝强
郇金来
王光
ZHU Jinqi;ZHANG Qiaoliang;YANG Zhaoqiang;HUAN Jinlai;WANG Guang(Zhanjiang Branch of CNOOC(China)Ltd.,Zhanjiang 524057,China)
出处
《海洋地质前沿》
北大核心
2025年第5期32-42,共11页
Marine Geology Frontiers
基金
中国海洋石油有限公司“十四五”重大科技项目“海上油藏气驱提高采收率技术”(KJGG2021-0505)。
关键词
成岩作用
沉积-成岩相
优质储层
涠洲组
涠西南凹陷
diagenesis
sedimentary diagenetic facies
high quality reservoir
Weizhou Formation
Weixi'nan Sag
