胡尖山油田三叠系延长组长21储层特征及控制因素

通过扫描电镜、铸体薄片、岩心和测井等相关资料分析，对鄂尔多斯盆地胡尖山油田三叠系延长组长2，砂岩储层特征进行研究。研究表明，储层砂岩主要为细一中粒长石砂岩和岩屑长石砂岩，分选较好，磨圆度以次棱状为主，填隙物以高岭石为主。储层物性较差，孔隙类型主要为粒间孔和长石溶孔，并发育少量的晶间孔及岩屑溶孔，属于低一中孔、低一特低渗...

Physical properties and the influencing factors of Member 21 sandstone of Yanchang Formation in Triassic period of Hujianshan Oilfield

Based on the data of SEM, casting lamella, core and logging, the reservoir characteristics of sandstones, which are located in Member 21 of Yanchang Formation of Triassic period in Hujianshan Oilfield of Ordos Basin,were examined. The results indicated that the sandstone of the reservoir is mainly composed of fine to medium arkose and lithic arkose with fair sorting and times - leng shaped psephicity. The major chink is kaolinite. With low to medium porous and low to extra - low permeability,the reservoir is relatively poor in physical property. The pore types of the reservoir include intergranular pore ,feldspar dissolved pore ,rock debris dissolved pore and intercrystalline pore ,among which the former two types take the majority. The primary influencing factors of the physical properties in the reservoir are sedimentary microfacies and digenesis. The reservoir property of sand body is fine in the distributary channel,while it is poor in river flanks and distributary interchannel. The physical property of the reservoir is damaged by compaction and cementation, and is improved by dissolution.