塔里木盆地克拉托地区中新统帕卡布拉克组储层物性及影响因素

克拉托地区帕卡布拉克组水下分流河道、河口沙坝沉积微相中砂体较为发育，形成岩性圈闭可能性较大。根据克拉托地区3条野外露头剖面岩性特征及样品实验数据，结合钻井资料，对其帕卡布拉克组砂岩储集物性及影响因素进行全面分析，为该地区寻找岩性圈闭提供储层依据。研究表明，克拉托地区帕卡布拉克组砂岩孔渗组合以中孔中高渗为主。砂岩储层物性主要受沉积环境和成岩作用控制，辫状河三角洲前缘沉积环境中砂体物性较好。胶结作用和自生黏土矿物使砂岩的原生孔隙大大减少，使其储集性能大大降低，而溶蚀作用使砂岩的储集性能得到较大改善。

Physical Properties and Influential Factors of Reservoir of Mesozoic Pakabulake Formation in Kelatuo Area of Tarim Basin

Sand bodies developed in the underwater distributary channels and channel mouth bars microfacies of Pakabulake Formation in Kelatuo area, quite possible to form lithologic traps. Based on the lithologic characteristics of three outcrop sections of Kelatuo area and the data of samples and combined with the drilling data, the physical properties and influential factors of sandstone reservoir of Pakabulake Formation were brought under full analysis in an attempt to provide the data for discovery of lithologic traps in this region. The study indicates that sandstone of Pakabulake Formation in Kelatuo area is mainly medium-porous and medium to high permeable. The physical properties of sandstone reservoir are controlled mainly by the sedimentary environment and diagenesis, with the sand bodies in the braided channel delta frontal environment kept desirably. Cementation and authigenic clay minerals made the primary pores decrease, thus lowering the storing functions of the reservoir substantially. However, dissolution greatly improved the storing functions of the sandstone reservoir.