广安构造须家河组须六段储层成岩作用与孔隙演化

Diagenesis and Porosity Evolution of Upper Triassic X6 Formation in Guang'an Structure

广安构造须家河组须六段储集岩主要为长石岩屑砂岩和岩屑砂岩,该砂岩储层是典型的低孔、低渗型储集岩。以岩心观察为基础,结合薄片鉴定、扫描电镜、阴极发光和物性等资料分析,认为研究区砂岩经历了压实作用、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、胶结作用起主要破坏性作用,溶蚀作用为主要建设性作用。

The reservoir of upper Triassic X^6 formation in Guang＇an structure is mainly feldspathic litharenite and lithic sandstone.The reservoir sandstone is typical low porous and low permeable reservoir rock. Based on core observation,this paper takes research and materials analysis on thin section observation,scanning transmission electron microscope observation,cathodolum inesconce and physical property, which indicates that the sandstone of the study area formation has gone through the diagnesis stage of compaction,cementation,metasomasis and solution,and now it is in the middle diagenesis stage B period. The diagenesis has the greatest effects in controlling physical property in this area.During the porosity evolution,the compaction and the cemetation mainly plays the role of destruction,the solution and the fracturing plays the role of construction.