【摘要】 根据实验分析,提出一种新的构建方法,该方法对单峰 T2谱,用单一幂函数构造毛管压力曲线;利用核磁共振(NMR)T2分布与孔隙结构直接相关,可以利用T2 分布来构建毛管压力曲线。对双峰 T2谱则用两种不同的幂函数在小孔和大孔处分段构造毛管压力曲线。分别利用线性方法和幂函数方法构建毛管压力曲线,与实验测量得到的毛管压力曲线相对比,新方法对于毛管压力曲线的构造精度有明显改进。更多还原

【Abstract】 Using NMR T₂ distribution to obtain reliable capillary pressure curves has potential application. The calibrations method based on the linear relationship between the T₂ distribution and pore size has obvious shortage. A new method is introduced. A simple power function is used to build capillary pressure curve for single-crest T₂ distribution, and two different subsection power functions are respectively used for the large and small pore sizes for double-crests T₂ distribution. Then the capillary pressure curves are respectively constructed by the linear method and the power function method, and compared with the experiment data obtained from the laboratory; The results show that the new method greatly increases the precision of the capillary pressure curve construction using NMR T₂ distribution.更多还原