关键词: 核磁共振测井, 毛管压力曲线, Swanson参数, 储层渗透率, 计算方法

Abstract:

Based on the fact that NMR T₂ distribution and capillary pressure curves can reflect the reservoir pore structure, a novel method was presented to calculate reservoir permeability by combining NMR log and capillary pressure data. A correlation model between Swanson parameter and rock permeability was established by analyzing plenty of core samples with mercury-injection and NMR log data. Considering the problem that capillary pressure data are limited by their quantity, the novel method was presented to acquire Swanson parameter from NMR T₂ geometric mean value and to calculate reservoir permeability consecutively. The permeability data in low-porosity and low-permeability reservoir of Well A calculated by the method are close to the result of air permeability obtained from core analysis, which indicates the accuracy and applicability of this method.

Key words: nuclear magnetic resonance (NMR) log, capillary pressure curve, Swanson parameter, reservoir permeability, computation method