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页岩渗透率与页岩气产能关系密切,是测井储层评价的重要参数之一.页岩储层岩性复杂致密,孔隙组分多样,导致传统渗透率评价方法受到限制.基于页岩渗透率主控因素,从孔隙结构出发,通过液氮吸附-高压压汞资料及核磁共振实验分析数据,提取控制页岩渗透率的孔隙结构参数,建立页岩渗透率评价模型;利用核磁T2谱构建出伪毛管压力曲线,获得二者之间的定量转换关系,并提取孔隙结构参数;最后利用核磁测井刻度常规测井曲线,并结合页岩岩石相分析,实现了页岩渗透率的较高精度评价.研究成果及应用对于国内页岩气产能建设及高效开发具有重要意义.
Shale permeability is closely related to shale gas productivity, which is one of the most important parameters for well logging evaluation. The lithology of shale reservoirs is complicated and compact with various pore compositions, which limits the traditional permeability evaluation methods. Based on shale According to the pore structure, the data of pore-structure of shale permeability were obtained by analyzing the data of liquid nitrogen adsorption-high pressure mercury intrusion and NMR data, and the pore structure parameters controlling the permeability of shale were extracted to establish the permeability evaluation model of shale. The pseudo-capillary pressure curve was constructed to obtain the quantitative conversion relationship between the two, and the pore structure parameters were extracted. Finally, the conventional log curves of NMR logging were calibrated and compared with shale lithofacies analysis to compare the permeability of shale High-precision evaluation.Research results and application for the domestic shale gas production capacity and efficient development of great significance.