基于断层协调性的古岩溶缝洞型储层分布识别方法——以川南栖霞组为例  

Identification of paleokarst fractured-vuggy reservoir based on fault coordination:A case study of the Qixia Formation in southern Sichuan Basin of China

作　　者：蒋柯 周文[1,2] 徐浩[1] 林亚尼 周秋媚[2] JIANG Ke;ZHOU Wen;XU Hao;LIN Yani;ZHOU Qiumei(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;College of Energy(College of Modern Shale Gas Industry),Chengdu University of Technology,Chengdu 610059,China;Halliburton(China)Energy Services Co.,Ltd.,Beijing 100020,China)

机构地区：[1]油气藏地质及开发工程全国重点实验室(成都理工大学),成都610059 [2]成都理工大学能源学院(页岩气现代产业学院),成都610059 [3]哈里伯顿(中国)能源服务有限公司,北京100020

出　　处：《成都理工大学学报（自然科学版）》2024年第5期787-796,812,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金面上项目(41972137);四川省自然科学基金面上项目(2022NSFSC0187)。

摘　　要：古岩溶缝洞型储层是碳酸盐岩储层的重要类型,准确识别古岩溶储层对碳酸盐岩油气藏勘探和开发具有重要作用。川南栖霞组是典型的缝洞型储层,具有低孔低渗的特点。由于早期岩溶缝洞体是典型的先存“力学结构面”,严重影响后期断裂的形成。据此,本文提出利用逆断层走向与局部构造轴向之间的协调性(断层协调性)来预测缝洞体,对栖霞组地层中的缝洞体储层进行分析与识别,并通过气井生产特征和地震识别对识别结果进行了验证,吻合度达85%以上。研究表明,栖霞组缝洞体的分布主要受控于背斜上及附近的“不协调逆断层”和向斜中的高角度逆断层,且高度不协调逆断层对缝洞体的识别精度更高。对其他地区古岩溶缝洞体的识别也具有一定参考意义。The paleokarst fractured-vuggy reservoir is an important type of carbonate reservoir,the accurate identification of which is crucial for the exploration and development of carbonate oil and gas reservoir as well as for accessing carbonate deposits.The reservoir of the Qixia Formation is a typical fractured-vuggy reservoir in southern Sichuan Basin,with the characteristics of low porosity and permeability.The early fractured karst vug is typical pre-existing“mechanical structural surface”that significantly influences the formation of subsequent faults.In this study,we use the coordination between the strike of the reverse fault and the axial direction of the local structure(fault coordination)to predict,analyze,and identify the fractured-vuggy reservoir in the Qixia Formation.The results were verified by the characteristics of production of gas wells and seismic data,and yielded an accuracy of higher than 85%.They showed that the distribution of the fractured vug in the Qixia Formation was mainly controlled by non-coordinated faults on and close to the anticline,and large-angle reverse faults in the syncline.The identification of fractured vugs based on highly non-coordinated faults yielded a higher accuracy than that based on the large-angle reverse faults.The work here provides an important reference for the identification of paleokarst fractured vugs in other regions.

关 键 词：古岩溶缝洞型储层 断层协调性 碳酸盐岩储层 川南栖霞组 

分 类 号：TE122[石油与天然气工程—油气勘探]