岩石物理实验“四参数”关系研究毛细管压力、核磁共振τ2谱、电阻增大率和相对渗透率

摘要

This paper approaches the internal relationship between the capillary pressure,NMR τ2 distribution,resistivity index and relative permeability.Based on the fractal theory of pore structure, the paper analyses and deduces the theoretical model of the four kinds of experimental data relations and verifies the model by the actual experiment design and experiments.The results show that the four kinds of experimental data as the static and dynamic parameters to describe the microscopic properties of rocks can be transformed into each other in a specific range of low water saturation.The capillary pressure is used to quantitatively analyse the pore structure properties of rocks,NMR is used to describe the occurrence of the pore fluid,the resistance is used to show the oil-bearing state of rocks,and the relative permeability is used to distinguish the wettability and multiphase fluid flow capacity.Actually,the petrophysical experimental parameters conversion platform established based on the theoretical model can comprehensively analyse and forecast the reservoir capacity situation.%探讨油藏勘探开发过程中的毛细管压力、核磁共振τ2谱、电阻增大率、相对渗透率4种岩石物理实验参数的内在联系。以分形理论为基础，分析并推导出4种实验数据关系的理论模型，并通过实际实验设计和联测进行验证，结果表明：在一定饱和度范围内，4种实验数据作为描述岩石微观特性的动态与静态参数可以相互转换；毛细管压力用于定量分析岩石的孔隙结构性质，核磁用于描述孔隙内流体赋存状态，电阻增大率用来表征岩石的含油气性，相对渗透率用以判别润湿性以及多相流体的相对流动能力，实际中以理论模型为依据建立岩石物理参数转换平台，能够较全面地基于岩石物理实验对储层产能情况进行分析预测。