鄂尔多斯盆地子洲-清涧地区山西组山23段储层物性特征研究

Studies of characteristics of reservoir properties of Shanxi Formation Shan23 Member in Zizhou-Qingjian area of Ordos Basin

利用研究区铸体薄片、扫描电镜、压汞分析及岩心观察和测井等各种资料，对鄂尔多斯盆地子洲-清涧地区山23储层物性特征及影响因素进行分析。研究结果表明：子洲-清涧地区山西组山2，段渗透率和孔隙度具有明显的正相关特征，其储层物性主要受控于沉积微相、岩石类型、粒度以及成岩作用。水下分流河道砂体孔隙度、渗透率相对较高，河口坝席状砂次之，分流间湾较差；石英砂岩物性普遍好于岩屑石英砂岩，岩屑砂岩则相对较差；砂岩的粒度越大，储层物性越好，粗砂岩、巨-粗砂岩的物性要明显好于中-粗砂岩、粗-中砂岩、细-中砂岩。成岩作用中压实作用和胶结作用是储层物性变差的主要原因，溶蚀作用是一种对储层有利的建设性成岩作用，有利于产生大量次生孔隙．成为碎屑岩储层主要储集空间。

Use a variety of information in the study area cast thin, SEM, mercury analysis and core observation and logging, analysis of the Zizhou-Qingjian area in the Ordos Basin Shan23 petrophysical characteristics and influencing factors. The results show that： the Zizhou-Qingjian Shan23 Member of Shanxi Formation permeability and porosity characteristics have a significant positive correlation. Its reservoir properties are mainly controlled by sedimentary microfacies, rock type, size, and diagenesis. Underwater distributary channel sand porosity, permeability is relatively high, mouth bar sand sheet, followed by split between the Gulf poor; quartz sandstone properties are generally better than lithic quartz sandstone, lithic sandstone is relatively poor; sandstone The larger the size, the better reservoir properties. Coarse sandstone, giant - the physical properties of coarse-grained sandstone to be significantly better than in - coarse-grained sandstone, coarse - grained sandstone, fine - medium-grained sandstone. Diagenesis of compaction and cementation are the main reason for deterioration of reservoir properties. Dissolution is a reservoir of beneficial and constructive diagenesis, help produce a large number of secondary porosity, makin~ clastic reservoirs in the main reservoir space.