川西孝泉下沙溪庙组储层特征研究及主控因素

摘要

通过对四川盆地孝泉地区下沙溪庙组砂岩的薄片观察,认为下沙溪庙组储层岩性主要为细-中粒岩屑长石砂岩和长石岩屑砂岩,有少量细粒岩屑砂岩和岩屑石英砂岩;储集空间类型以剩余粒间孔为主,粒间溶孔次之,物性较差,属于低孔低渗型储层,储层主要受有利沉积微相和溶蚀作用影响.%By analyzingthelamella characteristicsofthe Lower Shaximiao Formation in Xiaoquan area, we found that the reservoir is mainly consist of medium to fine lithicarkose and feldspathic litharenite,with a little fine litharenite and lithic quartz sandstone. The main reservoir space is residual intergranular pore and intergranular dissolved pore, with poor physical property. The reservoirs are of low porosity and low permeability. The development of reservoir is controlled by the sedimentary facies and dissolution.