玛湖凹陷北斜坡百口泉组储集层物性下限及控制因素  

Lower Limits of Reservoir Physical Properties and Controlling Factors of Baikouquan Formation on the Northern Slope of Mahu Sag

作　　者：郭华军 单祥 李亚哲 邹志文 王力宝 

机构地区：[1]中国石油杭州地质研究院,杭州310023

出　　处：《新疆石油地质》2018年第1期63-69,共7页Xinjiang Petroleum Geology

基　　金：国家973项目(2014CB239002);中国石油科技重大专项(ZX2012E-34-01)

摘　　要：综合运用试油、岩心分析和测井解释资料,利用分布函数曲线法和试油法,求取了玛湖凹陷北斜坡下三叠统百口泉组不同深度范围内的砂砾岩有效储集层物性下限,运用回归分析法对物性下限与深度进行了拟合。在此基础上,利用物性差值分析了岩相、沉积微相和成岩作用对砂砾岩有效储集层发育的影响。研究表明:研究区有效储集层物性下限随深度增加呈现逐渐降低的趋势;有效储集层发育主要受沉积微相和岩相类型的控制,成岩作用对其影响相对较弱,水下分流河道微相和辫状河道微相是有效储集层最有利发育区,板状交错层理砂岩相和槽状交错层理砂砾岩相有效储集层最发育;研究区砂砾岩主要处于中成岩阶段A期,有机质热演化释放的有机酸溶蚀长石形成次生孔隙,改善储集层物性,弱压实-弱溶蚀成岩相以及不稳定组分溶蚀成岩相有效储集层最发育。Based on the comprehensive application of the data on formation test, core analysis and logging interpretation, the low limits ofphysical properties of effective sandy conglomerate reservoirs in the Lower Triassic Baikouquan formation on the northern slope of Mahusag are determined by using the distribution function curve method and formation test method, and regression analysis method is used tomatch the lower limits of physical properties with depth. Based on which, lithofacies, sedimentary microfacies and diagenesis are analyzedby using the differences of reservoir physical properties. The results show that the lower limits of effective reservoir physical properties ex-hibit a trend of gradual decrease with the increase of depth in the study area; the development of effective reservoirs is mainly controlled bysedimentary microfacies and lithofacies, and weakly influenced by diagenesis. Microfacies of underwater distributary channel and braidedchannel are the most favorable areas for effective reservoir development, and tabular cross-bedding and trough cross-bedding are the mostfavorable lithofacies for effective reservoir development; the sandy conglomerate in the study area is mainly in the A stage of the middle dia-genetic period, the secondary pores result from feldspar dissolved by organic acid which is liberated from thermal evolution of organic mat-ter, which can improve reservoir physical properties, the effective reservoirs with the diagenetic faices of weak-compaction-weak-corrosionand unstable component corrosion are the most developed.

关 键 词：玛湖凹陷 北斜坡 百口泉组 砂砾岩有效储集层 分布函数曲线法 试油法 物性下限 控制因素 

分 类 号：TE112.23[石油与天然气工程—油气勘探]