琼东南盆地深水西区梅山组储层成岩-孔隙协同演化机制  

Reservoir Diagenesis Pore Co-Evolution Mechanism of Meishan Formation in Deepwater West Zone of Qiongdongnan Basin

作　　者：高彦杰 甘军 胡潜伟 江汝锋 汪紫菱 葛翔 沈传波[1,2] Gao Yanjie;Gan Jun;Hu Qianwei;Jiang Rufeng;Wang Ziling;Ge Xiang;Shen Chuanbo(School of Earth Resources,China University of Geosciences,Wuhan 430074,China;Key Laboratory of Tectonics and Petroleum Resources(China University of Geosciences),Ministry of Education,Wuhan 430074,China;Hainan Branch,CNOOC China Limited,Haikou 570311,China)

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]中国地质大学(武汉)构造与油气资源教育部重点实验室,武汉430074 [3]中海石油(中国)有限公司海南分公司,海口570311

出　　处：《吉林大学学报（地球科学版）》2024年第6期2014-2028,共15页Journal of Jilin University：Earth Science Edition

基　　金：中国海洋石油有限公司“十四五”重大科技项目(KJGG-2022-0103);湖北省自然科学基金创新群体项目(2021CFA031)。

摘　　要：琼东南盆地深水区乐东-陵水凹陷梅山组是目前油气勘探的热点,高温超压环境下梅山组储层成岩及孔隙演化过程是目前研究的重点。本文综合薄片、扫描电镜、储层物性、碳氧同位素、黏土X衍射等资料,开展乐东-陵水凹陷梅山组储层成岩作用研究,确定成岩共生序列,建立孔隙演化模式。研究结果表明:乐东-陵水凹陷梅山组储层经历压实、胶结、溶蚀等多种成岩作用;成岩序列为早期黏土胶结→方解石胶结→长石、碳酸盐矿物溶蚀→石英加大、自生石英颗粒→铁方解石、铁白云石胶结→一期油气充注→长石、碳酸盐矿物溶蚀→二期油气充注;高温和超压抑制胶结物发育的同时改善成岩流体,发育溶蚀孔隙,具有高温增孔、超压保孔的特点。The reservoir of Meishan Formation in Ledong Lingshui sag has become a research hotspot,and the study of diagenetic period and reservoir pore evolution in a high-temperature overpressure environment is extremely important in Qiongdongnan basin.In this paper,the diagenesis of Meishan Formation reservoir in Ledong Lingshui sag was studied by synthesizing the data of thin sections,scanning electron microscopes,reservoir physical properties,carbon and oxygen isotopes,and clay X-diffraction,so as to determine the diagenetic symbiosis sequence and establish the pore evolution model.The results show that the reservoirs of Meishan Formation in Ledong Lingshui sag have undergone various diagenesis processes such as compaction,cementation and dissolution,and the diagenetic sequences are as follows:early clay cementation→calcite cementation→feldspar,carbonate dissolution→quartz increase,authigenic quartz particles→iron calcite,iron dolomite cementation→first-phase oil and gas charging→feldspar,carbonate mineral dissolution→second-phase oil and gas charging.Under the influence of high temperature and overpressure,the development of cementation is inhibited and the dissolution porosity of diagenetic fluid is improved.The overall porosity increases due to the high temperature and remains unchanged under overpressure.

关 键 词：储层成岩作用 超压 孔隙演化 深水 梅山组 琼东南盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]