鄂尔多斯盆地延长组致密砂岩储层微观孔隙结构特征

Characteristics of micro-pore structure of tight sandstone reservoirs in Yanchang Formation,Ordos Basin

孔隙结构是研究储层物性的主要内容。该文在调研前人研究的基础上,分析总结了鄂尔多斯盆地延长组致密砂岩储层微观孔隙结构特征。结果表明:前人对鄂尔多斯盆地延长组储层微观孔隙结构表征参数选取不统一,一般选取能够代表研究区微观孔喉结构及渗流特征的优选参数,建立致密储层的分类评价标准。对致密油的孔隙结构表征方法主要有3种:数据统计分析方法、图像分析技术、数字岩芯技术。影响储层孔隙结构的成因复杂,主要是沉积作用和成岩作用;其中沉积作用决定致密砂岩储层原始物性,而成岩作用改造原生孔隙结构。综合认为在建立储层的分类评价标准时需要综合分析各类评价参数。

Pore structure is the main content of studying reservoir physical properties.Through investigating previous studies,analyze and summarize the characteristics of the micro-pore structure of the tight sandstone reservoirs of the Yanchang Formation in the Ordos Basin.The results show that there is no uniform standard for the selection of parameters that characterize the microscopic pore structure. Usually,the best parameters that can represent the microscopic pore-throat structure and seepage characteristics of the study area are selected to establish the classification and evaluation criteria for tight reservoirs.There are three main methods for characterizing the pore structure of tight oil: data statistical analysis method,image analysis technology,and digital core technology.The factors affecting the pore structure of the reservoir are complex,mainly sedimentation and diagenesis. Among them,sedimentation determines the original physical properties of tight sandstone reservoirs,and diagenesis transforms the primary pore structure. Therefore,it is necessary to comprehensively analyze various evaluation parameters when establishing the classification and evaluation standards for reservoirs.