川中地区寒武系洗象池组白云岩储层成岩作用及孔隙演化  

Diagenesis and pore evolution of dolomite reservoirs of Cambrian Xixiangchi Formation in central Sichuan Basin

作　　者：李璐萍 梁金同 刘四兵 郭艳波[4] 李堃宇[5] 和源 金九翔 LI Luping;LIANG Jintong;LIU Sibing;GUO Yanbo;LI Kunyu;HE Yuan;JIN Jiuxiang(Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610059,China;College of Energy,Chengdu University of Technology,Chengdu 610059,China;Chongqing Gas District,PetroChina Southwest Oil and Gas Field Company,Chongqing 400021,China;Research Institute of Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China;Foreign Technical Service Corporation,PetroChina Dagang Oilfield Company,Tianjin 300280,China)

机构地区：[1]成都理工大学沉积地质研究院,成都610059 [2]油气藏地质及开发工程国家重点实验室,成都610059 [3]成都理工大学能源学院,成都610059 [4]中国石油西南油气田分公司重庆气矿,重庆400021 [5]中国石油西南油气田分公司勘探开发研究院,成都610041 [6]中国石油大港油田分公司对外技术服务公司,天津300280

出　　处：《岩性油气藏》2022年第3期39-48,共10页Lithologic Reservoirs

基　　金：自然资源部沉积盆地与油气资源重点实验室开放基金“川中—川东地区洗象池组碳酸盐岩有利储层成因机制研究及勘探潜力分析”(编号:cdcgs2020005)资助。

摘　　要：四川盆地中部寒武系洗象池组是盆地内油气勘探重要的接替领域。通过对川中地区及邻区典型钻井岩心和薄片进行详细观察,结合物性分析,系统研究了该区洗象池组白云岩的储层特征与成岩演化,进一步探讨了储层孔隙演化模式与成岩作用之间的关系。研究结果表明:(1)川中地区寒武系洗象池组有利储集岩性主要为(残余)颗粒白云岩,其次为粗粉—细晶白云岩;储集空间主要为溶蚀孔洞,包括粒间溶孔、晶间溶孔以及溶洞等类型,主要发育裂缝-孔隙型储层。(2)洗象池组碳酸盐岩成岩演化经历了海水、大气淡水和埋藏等成岩作用,包括同生—准同生阶段、早成岩阶段、表生成岩阶段和晚成岩阶段。(3)成岩作用控制了洗象池组储层的孔隙演化,其中白云化作用和溶蚀作用是主要的建设性成岩作用,尤其表生溶蚀(岩溶)和埋藏溶蚀作用促进了孔隙的发育,而多期胶结充填作用充填了部分储集空间。The Cambrian Xixiangchi Formation in central Sichuan Basin is an important succeeding layer for oil and gas exploration in the basin.Based on the observation of typical drilling cores and thin sections in central Sichuan Basin and its adjacent areas,combined with physical property analysis,the dolomite reservoir characteristics and diagenetic evolution of Xixiangchi Formation in central Sichuan Basin were studied,and the relationship between reservoir pore evolution model and diagenesis was discussed.The results show that:(1)The favorable reservoir lithologies of Xixiangchi Formation in central Sichuan Basin are mainly(residual)granular dolomite,followed by coarse powder-fine crystal dolomite.The reservoir space mainly consists of dissolved pores,including intergranular dissolved pores and intercrystalline dissolved pores and vugs,and the reservoir is mainly fracturepore type.(2)The carbonate rocks of Xixiangchi Formation experienced seawater,atmospheric fresh water and burial diagenesis,including four diagenetic stages:syngenetic-penecontemporaneous stage,early diagenetic stage,epidiagenetic stage and late diagenetic stage.(3)Diagenesis controls the reservoir pore evolution of Xixiangchi Formation,dolomitization and dissolution are the main constructive diagenesis,especially supergenetic dissolution(karstification)and burial dissolution are of great significance to pore development,while multi-stage cementation and filling are the main destructive diagenesis.

关 键 词：颗粒白云岩 裂缝-孔隙型储层 表生溶蚀 埋藏溶蚀 孔隙演化 洗象池组 寒武系 川中地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]