四川盆地西北部中三叠统雷口坡组储层研究  

Study on reservoir of the Leikoupo Formation of Middle Triassic in northwestern Sichuan Basin

作　　者：曾德铭[1] 王兴志[1] 张帆[1] 宋章强 张若祥 朱永刚[3] 李跃刚[3] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500 [2]中海石油有限公司天津分公司,天津塘沽300452 [3]西南油气田分公司川西北气矿,四川江油643000

出　　处：《古地理学报》2007年第3期253-266,共14页Journal of Palaeogeography：Chinese Edition

基　　金：教育部"新世纪优秀人才支持计划"(编号:NCET-04-0911);四川省重点学科建设项目(编号:SZD0414)资助

摘　　要：根据四川盆地西北部中三叠统雷口坡组野外剖面及钻井岩心的宏观及微观特征,结合常规物性资料,对其储层的储集空间类型、岩性与物性、纵向分布等基本特征以及沉积和成岩作用等主要控制因素进行了较为深入的研究,探讨了主要储层的形成与演化过程,预测了有利储层分布。该套地层的储层集中分布于雷口坡组雷三段中亚段,主要岩石为砂屑白云岩、藻粘结白云岩和晶粒白云岩;以溶蚀孔隙占绝对优势,溶洞和原生孔隙较少,裂缝起到连通孔隙的作用。该套储层属于中孔中低渗的孔隙型和中孔高渗的裂缝—孔隙型。它是在内碎屑滩和藻粘结颗粒滩沉积体的基础上经受了表生期和埋藏期岩溶作用的改造,以粒间溶孔、藻粘结“格架”溶孔和晶间溶孔为主的岩溶型储层,主要受沉积和成岩作用及其他因素控制,滩体和岩溶发育部位相叠合的中坝—双鱼石区块,为良好储层的分布区带。Based on the macro-features and micro-features of the outcrop sections and the drilling cores of the Leikoupo Formation of Middle Triassic in the northwest Sichuan Basin, and combined with the conventional petrophysical properties, this paper profoundly studies the basic features of the reservoir space types, petrographic and petrophysical properties, vertical distribution, as well as the main factors controlling sedimentation and diagenesis. Furthermore, it discusses the development and evolution of main reservoirs and predicts the favorable reservoir distribution area. The reservoir concentrates in the middle part of member 3 of the Leikoupo Formation, where the rock types are mainly the sand-sized intraclastic dolostone, algae-bounding dolostone and macrocrystalline dolostone. The corrosion pore is predominant, while the dissolved cavity and primary pores are subordinate. The fractures play a role in connecting the pores. The reservoirs are of the pore type of moderate porosity and moderate-lower permeability, and the fracturepore type of moderate porosity and high permeability. Study shows that the reservoir is a karst reservoir in which pores are dominated by intergranular dissolved pores, algae-bounding framework dissolved pores and inter-crystalline dissolved pores. The original rocks laid down as the intraclast bank and algae-bounding grain bank have experienced karsting during the hypergenic and burial stages. The reservoir resulted from the interactive influence of sedimentation and diagenesis. The favorable reservoir is distributed in the Zhongba-Shuangyushi block, which is the superimposed area of the bank and karst development zone.

关 键 词：四川盆地西北部 中三叠统 雷口坡组 储层 沉积作用 成岩作用 

分 类 号：TE122.24[石油与天然气工程—油气勘探]