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平均孔喉半径是表征储集层孔隙结构的一个重要参数。核磁共振测井提供了精确的储层孔隙度和丰富的孔隙结构方面的信息,为孔喉半径的计算提供了有利途径。通过对胜利油区惠民凹陷基山砂岩油藏的研究,建立了利用核磁共振测井资料计算平均孔喉半径的2种方法,2种方法的计算结果具有很好的一致性,并与岩心分析资料符合较好。利用平均孔喉半径对基山砂岩体储层进行质量分级,即一类、二类、三类储层的平均孔喉半径分别为大于1.2μm,0.25～1.2μm和小于0.25μm,低孔、低渗透储层改造层位的选择和优化提供了依据。
The average pore throat radius is an important parameter to characterize the pore structure of the reservoir. Nuclear magnetic resonance logging provides accurate information on reservoir porosity and abundance of pore structure, providing an advantageous way of calculating the pore throat radius. Based on the research on the basement sandstone reservoirs in the Huimin Depression of Shengli Oil Region, two methods for calculating the average pore throat radius using NMR logging data are established. The calculated results of the two methods are in good agreement with those of the core analysis Data in line with better. The average pore throat radius is used to classify the basement sandstone reservoirs, that is, the average pore throat radius of the first, second and third reservoirs is more than 1.2μm, 0.25 ~ 1.2μm and less than 0.25μm, respectively. Provided a basis for selection and optimization of permeable reservoir alteration horizon.