准噶尔盆地永进地区侏罗系层理缝成因及其对储层的影响  

Genesis of bedding fractures and its influences on reservoirs in Jurassic,Yongjin area,Junggar Basin

作　　者：贺振建[1] 刘宝军[1] 王朴[1] 

机构地区：[1]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2011年第1期15-17,112,共3页Petroleum Geology and Recovery Efficiency

摘　　要：准噶尔盆地永进地区侏罗系由于埋藏深、成岩作用强烈,储层物性总体较差,但在侏罗系顶部红层中发育相对较好的储层,并获得了工业油气流。根据岩心观察,结合薄片、测井及试油等资料可知,优质储层的发育及分布与层理缝密切相关。层理缝不仅是良好的储集空间,而且增大了孔隙的连通性,为有机流体的运移提供了通道,促进了次生孔隙的发育。同时,层理缝对储层的影响程度与其密度直接相关,密度越大,储层物性越好。研究结果表明,颗粒粗、分选好的砂岩层易形成层理缝,车莫古隆起强烈抬升及断层活动是开启层理缝的主要动力,早期烃类充注和后期异常高压为层理缝的保存或进一步开启提供了条件。永进地区侏罗系有利勘探方向为永1井区向东北的车莫古隆起的隆升方向,靠近断层的区域为最有利的地区;永2和永9井区是次一级勘探有利区。Existing research results show that the reservoir properties are relatively poor in overall Jurassic,Yongjin area of Junggur Basin,due to high burial depth and intensive diagenesis.But in the red sandstone layer at top of the Jurassic,high-quality reser-voirs developed with industrial oil and gas flow in some regions.According to core observation,thin section,well logging data and the oil testing data,it is thought that the development and distribution of high-quality reservoirs is closely related with bedding fractures.Bedding fractures are important for reservoir storage space,and may increase the porosity of connectivity,as well as providing a channel for the organic fluid migration and enhancing the development of secondary pores.The favorable reservoir is directly dependant on the density of bedding fractures,that is,the denser the bedding fractures,the more favorable reservoir.Studies suggest that,bedding fractures are inclined to develop in the sandstone with coarse granulur texture and better sorting.Strong uplifted and the fault development within the Chepaizi-Mosuowan paleo-uplift are the main driving force for opening bed-ding fractures,early hydrocarbon infilling and later abnormal pressure are favorable for preserving or accelerating opening bedding fractures.It is pointed herein that the favorable exploration targets in Jurassic of Yongjin urea is the uplift direction of Chepaizi-Mosuowan paleo-uplift which is in the north-east of the Yong-1 Well area,moreover,the Yong-2 Well urea and Yong-9 Well area are the secondary exploration targets.

关 键 词：层理缝 优质储层 侏罗系 永进地区 准噶尔盆地 

分 类 号：TE112.22[石油与天然气工程—油气勘探]