成岩作用对四川盆地广安构造须家河组储层物性的影响

THE EFFECT OF DIAGENESIS ON RESERVOIR PHYSICAL PROPERTY OF XUJIAHE FORMATION IN GUANG'AN STRUCTURE,SICHUAN BASIN

通过对广安构造须家河组碎屑岩储层的常规薄片及铸体薄片镜下鉴定,结合区域地质、钻井、测井、物性分析等资料,从储层的原始组份及粒度、成岩作用及其顺序等方面,分析了广安构造须家河组储层物性的主要特征,研究了不同成岩作用对储层物性的影响,提出了该区溶蚀作用、构造破裂作用及部分胶结作用对改善储层物性具有建设性的作用,而压实-压溶作用和胶结作用则对储层物性具有破坏性的作用,其交代作用对储层物性影响不明显。

According to the microscopic identification of both conventional and casting thin sections of clastic reservoir in Xujiahe Formation of Guang'an Structure,the main reservoir physical properties were analyzed and the effect of different diagensis on physical property were also studied in terms of the original component,grain size,diagenesis and its order by a series of data from regional geology research,drilling,well logging and physical-property analysis.This paper demonstrates that the effect of karstification,tectonic fracturing and part cementation on physical property is constructive whereas the effect of compaction-karstification and cementation is destructive.In addition,the effect of metasomasis is not obvious.