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核磁共振测井作为一种全新的测井方法可以直观而准确地提供储层的有效孔隙度、渗透率、束缚水饱和度等参数 ,而且能够通过T2cutoff值区分可动流体体积和毛管束缚流体体积 ,进而深入地反映储层的孔隙结构。本研究以半渗透隔板的毛管压力资料为基础 ,建立了核磁共振测井中的T2 几何平均值与孔隙结构参数之间的关系 ,并建立了应用核磁共振测井资料确定储层微观孔隙结构参数的方法。研究表明 :T2 分布与孔隙结构密切相关 ,而且能反映储层的孔隙结构。同时以岩心分析资料为基础 ,核磁共振测井资料为中介 ,利用常规测井计算的渗透率和孔隙度的比值与孔隙结构参数建立了关系 ,对于指导生产具有重要的意义。
As a new logging method, NMR logging can intuitively and accurately provide parameters such as effective porosity, permeability and irreducible water saturation of reservoirs, and can distinguish the volume of movable fluid and the volume of capillary bound fluid by T2 cutoff , And then further reflect the pore structure of the reservoir. Based on the capillary pressure data of semi-permeable bulkhead, the relationship between T2 geometric mean and pore structure parameters in NMR log was established and the relationship between microstructure and pore structure Method of the parameter The results show that T2 distribution is closely related to the pore structure and can reflect the pore structure of the reservoir. At the same time, based on core analysis data and NMR logging data, the relationship between permeability and porosity ratio and pore structure parameters calculated by conventional logging is of great significance for guiding production.