川东北MLB地区须家河组须四段储层特征研究

Research of Xu-4 Member Reservoir Character of Xujiahe Formation of MLB Area in Northeast Sichuan

综合岩心、岩屑、薄片资料的观察，对川东北MLB地区须四段储层岩性基本特征、储集空间类型、物性特征及孔隙结构特征进行了研究。分析认为，储层岩性主要为杂色砾岩、含砾粗砂岩、中～细粒岩屑砂岩，储集空间类型以残余原生粒间孔为主，少量溶蚀孔隙。包括粒间、粒内溶孔，局部见微裂缝，连通性差。储层的孔、渗呈一定的相关性，相关系数为0．403，平均孔隙度为1．08％，平均渗透率为0．03roD，吼道类型以片状为主，属微喉结构。认为研究区可能是一套特低孔、特低渗致密的孔隙型储层段。

Based on analysis of cores,cuttings samples,thin-sections,general understanding on the reservoir characteristics,types of space,physical and porosity structure properties is obtained.Three types of lithology are identified,there are mixed-color conglomerate,gravel contained and coarse sandstone,middle to small grained sandstone,two main reservoir spaces are identified,it's remained original bores between grains,the other is corrode bores,it contains two types:corrode bores between or within grains.The micro-fractures were identified there,but the connecter capability was't good.There existed a matching positive correlation among porosity and penetration rate,the index is 0.403,the average porosity and penetration rate are 1.08% and 0.03mD,the micro-throat is the common throat type,it presents the schistose texture.So the especially low porosity and porositied reservoirs are developed.