核磁共振岩心实验研究储层孔隙结构

:核磁共振技术的应用，不仅能够提供准确的储层参数，还为测井解释研究孔隙结构提供了一种有效的方法。以商×井岩心实验分析为基础，深入探讨了从核磁共振T2分布转换毛管压力曲线的线性方法和非线性方法，优选出适合本地区的方法，并从转换后的毛管压力曲线中提取了孔喉半径均值、孔喉半径中值、分选系数等孔隙结构特征参数。对照压汞测量结果，发现两者吻合较好。不仅验证了构造方法的适用性，也说明了利用核磁共振T2分布定量分析研究孔隙结构的有效性。

Experimental study of pore structure with nuclear magnetic resonance

Nuclear magnetic resonance measurement not only yields accurate reservoir parameters,but also provides a new and effective way for studying pore structure from logging interpretation.Based on core experiments,we discussed two kinds of methods that are used for constructing capillary pressure curves from NMR T2 distribution.Pore structure parameters such as mean of throat radius,median of throat radius,and coefficient of sorting were calculated from the constructed capillary pressure curves.The resulted values are in well agreement with those from mercury intrusion method.This confirms the feasibility of the construction method and effectiveness of studying pore structure with NMR measurement.