准噶尔盆地乌夏地区二叠系碎屑岩储层成岩作用与孔隙演化  

Diagenesis and porosity evolution of Permian reservoir in Wu-Xia Area,Junggar Basin

作　　者：牛海青[1] 陈世悦[1] 张鹏[2] 鄢继华[1] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]中国石化股份胜利油田分公司物探研究院,山东东营257022

出　　处：《中南大学学报（自然科学版）》2010年第2期749-758,共10页Journal of Central South University:Science and Technology

基　　金：中国石油科技攻关项目(B20060104)

摘　　要：对岩芯进行观察,并对薄片进行电镜扫描和物性分析及鉴定,对储层成岩作用过程进行研究。研究结果表明:乌夏地区二叠系砂岩经历了机械压实作用、胶结作用、交代作用、溶蚀作用、破裂作用等多种成岩作用,目前已达到中成岩期A亚期—晚成岩期;储层的孔隙演化与成岩作用密切相关;机械压实作用、化学胶结作用是导致砂岩孔隙度降低、储集性能变差的主要因素,孔隙损失分别达23.65%和4.30%;长石颗粒、火山岩岩屑、钠长石、沸石、碳酸盐胶结物的溶蚀及刚性颗粒的破裂作用是形成次生孔隙的主要因素,明显提高了乌夏地区二叠系砂岩储集性能,孔隙增生量达4.90%。Core was observed, and the thin section was analyzed through SEM observation and reservoir property analysis. The results show that the Permian reservoirs in Wu-Xia Area are primarily in A-substage of middle diagenesis and late diagenesis, which mainly undergoes compaction, cementation, dissolution and fracturing processes. The porosity evolution of reservoir is closely related with the diagenesis types. Mechanical compaction and chemical cementation are the main reasons for destroying primary pores, which contribute 23.65% and 4.30% to the loss of primary porosity respectively. The dissolution of feldspar, volcanic fragments, clay mineral, zeolite, calcite and the fracturing of rigid particle are the main factors for forming secondary pores, which obviously improves the reservoir property for increasing reservoir porosity by 4.90%.

关 键 词：准噶尔盆地 乌夏地区 二叠系 成岩作用 孔隙演化 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P588.2[天文地球—岩石学]