川中广安构造须家河组须二段储层成岩作用与孔隙演化  

Diagenesis and porosity evolution of reservoir in the 2th member of Xujiahe Formation of Guangan Structure in central Sichuan region

作　　者：王伟[1] 王兴志[1] 张帆[1] 付斌[2] 蒋志斌[3] 张金友[4] 

机构地区：[1]西南石油大学资源与环境学院,四川成都610500 [2]西南油气田分公司天然气经济研究所,四川成都610051 [3]新疆油田公司,新疆克拉玛依834000 [4]大庆油田有限责任公司,黑龙江大庆163712

出　　处：《复杂油气藏》2009年第3期14-19,共6页Complex Hydrocarbon Reservoirs

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

摘　　要：川中地区上三叠统须家河组二段砂岩是四川盆地内的天然气储层之一,其中广安构造须家河组须二段储集岩主要为细—中粒岩屑砂岩、长石岩屑砂岩,该砂岩储层是典型的低孔、低渗型储集岩。在对该区上三叠统须家河组气藏宏观沉积特征研究的基础上,采用岩石薄片、铸体薄片、扫描电镜及X射线衍射等方法,对该气藏储层的成岩作用、孔隙演化及其对储集物性的影响进行了探讨,认为研究区砂岩经历了压实压溶作用、胶结作用、交代作用、溶解作用以及破裂等多重成岩作用,目前已达到了中成岩阶段B亚期。成岩作用是控制该区储层物性的一个关键因素,在孔隙演化过程中,压实压溶、胶结作用起主要破坏性作用,溶蚀作用、环边绿泥石胶结物为主要起建设性作用。Sandstone in the 2th member of Xujiahe Formation of the Upper Triassic is one of the main gas reservoirs in central Sichuan region, in which reservoir rocks of the 2th member of Xujiahe Formation of Guangan structure are fine to medium-grained lithic sandstone and Ieldspathic sandstone, which have typical low permeability and low porosity. Based on the study of macroscopic depositional characteristics of the gas reservoirs in the Upper Triassic Xujiahe Formation in the central Sichuan Basin, various methods, such as rock thin section, cast thin section, scanning electron microscope and X ray diffraction, are used to systematically and thoroughly study the diagenesis and its influences on the storage capacity of gas reservoirs and porosity evolution in the area. It is considered that the sandstone in the area went through the diagnesis stage of compaction, pressure solution, cementation, metasomasis, solution and fracturing, and now it is in the middle diagenesis stage B period. The diagenesis has great effects in controlling physical property in this area. During the porosity evolution, the compaction, pressure solution and cementation mainly played the role of destruction, and the solution and rim chlorite cementation played the role of construction.

关 键 词：储层 成岩作用 孔隙演化 须家河组须二段 四川广安 

分 类 号：TE122.3[石油与天然气工程—油气勘探]