利用核磁共振T_2分布构造毛管压力曲线的新方法  

A New Method to Obtain Capillary Pressure Curve Using NMR T_2 Distribution

作　　者：何雨丹[1] 毛志强[1] 肖立志[1] 张元中[1] 

机构地区：[1]中国石油大学资源与信息学院,北京102249

出　　处：《吉林大学学报（地球科学版）》2005年第2期177-181,共5页Journal of Jilin University：Earth Science Edition

基　　金：中国石油天然气集团公司应用基础研究项目(030301)

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。Using NMR T_2 distribution to obtain reliable capillary pressure curves has potential application. The calibrations method based on the linear relationship between the T_2 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 T_2 distribution, and two different subsection power functions are respectively used for the large and small pore sizes for double-crests T_2 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 T_2 distribution.

关 键 词：核磁共振 T2分布 毛管压力曲线 孔隙结构 

分 类 号：P618.13[天文地球—矿床学]