东濮凹陷桥口构造沙三段储层成岩作用与孔隙演化  

DIAGENESIS AND POROSITY EVOLUTION OF THE RESERVOIR OF THE MEMBER 3 OF SHAHEJIE FORMATION IN QIAOKOU AREA IN DONGPU SAG

作　　者：蒋庆平[1] 李德敏[1] 罗洋[1] 王刚[2] 

机构地区：[1]成都理工大学'油气藏地质及开发工程'国家重点实验室,四川成都610059 [2]中国石化西北油田分公司塔河油田,新疆轮台841604

出　　处：《新疆地质》2008年第4期382-385,共4页Xinjiang Geology

摘　　要：通过薄片观察、鉴定可知,桥口地区沙河街三段储集层砂岩成岩作用主要有压实作用、胶结作用、交代作用和溶蚀作用.孔隙以粒间溶孔、粒内溶孔和胶结物溶孔等次生溶孔为主.经粘土矿物X衍射分析,将成岩阶段划分为早成岩A、B期和晚成岩A1、A2、B期,早成岩A、B期的机械压实和胶结作用使原生孔隙大量丧失,晚成岩A1溶蚀作用对储层孔隙起重要改善作用,增加大量次生孔隙,晚成岩A2、B期方解石胶结物的胶结作用使砂岩次生孔隙大量减少.因此早期原生孔隙的大量散失、晚期胶结作用使次生孔隙大量减少是造成本区砂岩低孔、低渗的主要原因.From the analysis of thin slice,The diagenesis of The reservoir sandstone includes compaction,cementation, dissolution and denudation in the Member 3 of ShaHeJie Formation In Qiaokou area,The pores are mainly of secondary pores such as dissolution pores between grains and in grains and cement pores：Based on the X ray diffraction of clay minera,the diagenetic stages here are classified as earlier diagenetic A, later diagenetic A1, A2, B, the cementation and compaction contribute to the massive loss of porosity in the Earlier diagenesis A and B,dissolution plays an important role in improving the pores and Xreated a large number of secondary pores increased in the later diagenetiX A1,Lots of The seXondary pores are reduced because of the cementation of calcite cements in the later diagenetic A2, B：So the early lost of great number of primary porosity, and the late reduce of the secondary pores are the main factors of low porosity and low permeability of sandstone.

关 键 词：桥口构造 沙河街三段 成岩作用 孔隙演化 

分 类 号：P618.13[天文地球—矿床学]