摘要
低缓斜坡型致密砂岩气藏在鄂尔多斯盆地内较为典型，各层段压裂后的产能存在差异。通过岩心观察、铸体薄片鉴定、扫描电镜、压汞等实验结果，结合测试资料，对鄂尔多斯盆地某致密砂岩气藏的千5段和盒8段储层的沉积特征、岩石学特征、孔隙类型及微观孔隙特征进行了分析，结合目前开发现状得出的测试层段物性下限进行对比，认为单井产能受储层沉积环境的影响和制约，千5段水下分流河道产能高于盒8段辫状河道沉积。以地质为基础的产能影响因素分析为下一步开发有利区的选择奠定了基础。
The low-lying and flat slope tight-sandstone gas reservoirs are typical in the Ordos Basin. There are differences in the productivity dter fracturing of each horizon. In this paper, the sedimentary characteristics, petrological characteristics, types of the pores, and microscopic pore characteristics of the reservoirs of the Qian5 and He8 Members of a tight sandstone gas reservoir in the Ordos Basin are analyzed through the core observation, cast thin sections identification, scanning electron microscopy, mercury intrusion, and other experiment data. Comparing the lower limit of physical properties of the tested intervals of strata obtained by combining with the current development status, it is considered that the production capacity per well is affected and restricted by the depositional environment. The production capacity of the underwater distributary channel in the Qian5 Member is higher than that of the braided channel deposition in the He8 Member. The geology-based analysis of influencing factors of productivity capacity lays the foundation for the favorable area selection of the next step development.
关键词
低缓斜坡型
致密砂岩气
储层特征
low-lying and flat slope
tight sandstone gas
reservoir features
