川西坳陷中段须四段储层定量成岩相特征

Characteristics of diagenetic facies of fourth Member of Xujiahe Formation in middle area of western Sichuan Depression

陈贤良 2 纪友亮² 杨克明³

西安科技大学，陕西 西安 710054 中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249 中国石化西南油气分公司，四川 成都 610016

Xi′an University of Science and Technology, Xi′an 710054, China State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China Southwest Oil and Gas Company, SINOPEC, Chengdu 610016, China

利用储层地质学理论与方法，对川西坳陷中段须四段储层压实、胶结和溶蚀3种主控成岩作用的成岩强度定量计算，厘定成岩强度标准，并在此基础上划分成岩相类型，建立不同类型成岩相测井响应特征，研究成岩相平面展布特征。结果表明：压实强度划分为弱、中、中强和强4个标准，胶结程度及溶蚀程度均划分为弱、中和强3个标准，将川西坳陷中段须四段储层划分为中强压实中溶蚀相、强压实中溶蚀相、强胶结弱溶蚀相、强压实弱溶蚀相、强胶结相和强压实相6种成岩相类型，成岩相平面展布受物源和沉积相的控制作用明显。其中，中强压实中溶蚀相和强压实中溶蚀相为有利的储集相带，平面上主要分布在孝新合构造带和中江—洛带地区，纵向上，上亚段相对优质成岩相储层物性好于下亚段。

Based on the principle and method of reservoir geology, the present paper comprehensively investigated the quantitative intensity of reservoir diagenesis of the fourth Member of Xujiahe Formation in middle area of western Sichuan Depression, determined the division standards of diagenesis intensity, distinguished types of diagenetic facies, discussed logging curve features of diagenetic facies, and examined lateral distributions of diagenetic facies. The results show that compaction intensity is divided into four standards including weak, medium, medium-strong and strong, and the intensity of cementation and dissolution are classified as weak, medium and strong. The reservoirs are divided into six types of diagenetic facies including medium-strong compaction with medium dissolution facies, strong compaction with medium dissolution facies, strong compaction with weak dissolution facies, strong cementation with weak dissolution facies, strong compaction facies and strong cementation facies. The plane distribution of diagenetic facies is significantly controlled by sedimentary facies and provenance. The medium-strong compaction with medium dissolution facies and strong compaction with medium dissolution facies are favorable reservoir facies belts, which are mainly distributed in Xiaoxinhe tectonic zone and Zhongjiang-Luodai Area. Vertically, the reservoir properties of relatively high quality diagenetic facies in the upper sub-member of the fourth Member of Xujiahe Formation is better than the lower sub-member.

10.6056/dkyqt201701002