鄂尔多斯盆地西南部上古生界致密砂岩储层孔隙结构研究  

Research on the pore structure in the upper Paleozoic tight reservoir,southwest of Ordos basin

作　　者：曲付涛 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《石油化工应用》2016年第1期56-60,共5页Petrochemical Industry Application

基　　金：国家大型油气田与煤层气开发项目;项目编号:2011ZX05007-004

摘　　要：利用场发射扫描电镜技术、CT扫描技术结合常规薄片、铸体薄片分析对鄂尔多斯盆地西南部上古生界山1、盒8段致密砂岩储层孔喉结构特征进行研究。研究表明,盆地西南部上古生界致密砂岩储层发育大量微米-纳米级孔隙,微米级孔隙包括残余粒间孔、粒内溶孔及晶间孔,纳米级孔隙包括粒内孔、黏土矿物晶间孔和微裂隙。通过CT扫描分析对盆地西南部上古生界致密储层孔隙结构进行三维重构,对储层孔喉在三维空间的分布及其连通性分析,结果表明,盆地西南部上古生界致密砂岩储层非均质性较强,连通孔隙主要受喉道均值半径的控制,只占总孔隙度的40%~70%。Using field emission scanning electron microscopy（SEM） technology, combined with the computed tomography（CT）scanning technology and the conventional thin sections,geographic casting thin sections, this article analyzed the pore structure characteristics of tight reservoir in Shan-1 and He-8 formation during the upper Paleozoic in the southwest of Ordos basin.The study indicates that the tight reservoir in the upper Paleozoic of the southwest of Ordos basin developed a lot of micro-nanoscale pore, micron scale pore include residual intergranular pore, intragranular dissolved pore and intracrystalline pore, nanoscale pore included intragranular pore, clay mineral intercrystal pore and microcracks.To analyzed the three dimensional space distribution of pore throat and connectivity,the tight reservoir has been restricted of the three dimension through the analysis of the CT scan. The results show the tight reservoir in the upper Paleozoic of the southwest of Ordos basin has a great heterogeneity and the connected pore is mainly controlled by average throat radius,only occupies 40 %~70 % of the total porosity.

关 键 词：场发射扫描电镜 CT扫描 孔隙结构 致密砂岩储层 鄂尔多斯盆地西南部 

分 类 号：P618.13[天文地球—矿床学]