成岩作用对碎屑岩不整合储层物性的影响——以准噶尔盆地夏子街地区三叠系顶部不整合为例  

The Effect of Diagenesis on the Physical Properties of Clastic Unconformity Reservoirs:A Case of the Unconformity on the Top of Triassic in Xiazijie Area of Junggar Basin

作　　者：高长海[1] 张嘉豪 张新征 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中石化胜利油田分公司地质录井公司,山东东营257064

出　　处：《长江大学学报（自然科学版）》2018年第19期6-11,36,共7页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项(2016ZX05006-007;2017ZX05001-001);山东省自然科学基金项目(ZR2017MD028)

摘　　要：不整合储层形成机制有别于常规储层,成岩作用对其物性具有十分重要的影响。在岩心观察的基础上,进行了普通薄片、铸体薄片、扫描电镜等分析测试,开展了准噶尔盆地西北缘三叠系顶部碎屑岩不整合储层的成岩作用特征研究,并探讨了成岩作用对储层物性的影响。不整合储层主要经历了压实作用、胶结作用、溶蚀作用和破裂作用等成岩作用,现处于中成岩A亚期,岩石蚀变程度具有随距不整合面距离的增加而减弱的变化规律。成岩作用对储层物性具有明显的影响,压实作用和胶结作用使孔隙减少,物性变差;溶蚀作用和破裂作用使孔隙增加,物性变好。成岩作用对不整合储层物性影响的相对强弱顺序依次为压实作用、溶蚀作用、胶结作用和破裂作用。The formation mechanism of unconformity reservoir was different from that of conventional reservoir,and diagenesis had a very important influence on its physical properties.On the basis of core observation,the characteristics of diagenesis of the upper clastic unconformity reservoirs of Triassic in northwestern margin of Junggar Basin were studied by means of analysis and test of ordinary thin slice,casted thin slice and scanning electron microscope,the effect of diagenesis on reservoir physical properties was also discussed.The unconformity reservoir mainly experienced diagenesis,such as compaction,cementation,dissolution and fracture.It was in sub-stage A of middle diagenesis,and the degree of rock alteration was weakened with the increase of distance from unconformity surface.The diagenesis had obvious influence on reservoir physical properties.Compaction and cementation caused porosity decrease and physical property become worse.The dissolution and rupture increased porosity and improved physical properties.The relative order of diagenesis on the physical properties of unconformity reservoirs is compaction,dissolution,cementation and rupture.

关 键 词：不整合 半风化岩石层 成岩作用 储层物性 准噶尔盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]