利用覆压孔渗实验数据计算岩石孔喉比的方法  

A method for calculating pore throat ratio of rock by using porosity and permeability experiment data under overlying pressure

作　　者：杨帆 王谦 李晓 YANG Fan;WANG Qian;LI Xiao(China National Logging Corporation,Xi’an 710077,Shaanxi)

机构地区：[1]中国石油集团测井有限公司,陕西西安710077

出　　处：《长江大学学报(自然科学版)》2025年第1期47-54,共8页Journal of Yangtze University(Natural Science Edition)

基　　金：中国石油天然气集团公司科学研究与技术开发项目“测井数字岩石技术研究”(2021DJ4003);中国石油集团测井有限公司十大科技项目“重点勘探领域测井解释评价核心技术攻关”(CNLC2022-8B02)。

摘　　要：孔喉比是反映储层微观孔隙结构好坏的重要参数之一,通常以恒速压汞、CT扫描等获取岩石孔喉比的方法在无此类实验的井中难以推广应用。基于串联毛细管束模型,推导了岩石孔喉比与覆压前后孔隙度、喉道横截面积变化率以及孔隙度变化率的理论关系。构建孔喉比的数学方程,根据覆压孔渗实验数据确定了方程中的变量并通过迭代算法对方程求解,建立了一种利用覆压孔渗实验数据计算岩石孔喉比的方法。在此基础上,将岩心分析资料与常规测井资料相结合,实现了岩石孔喉比的连续表征,且与岩心分析结果趋于一致,能够用于单井纵向上的分析与对比。研究结果为储层评价和油藏开发中岩石孔喉比的深入应用提供了一种新的思路。Pore throat ratio is one of the important parameters reflecting the micro pore structure of reservoir.It is difficult to popularize the methods of obtaining rock pore throat ratio by constant velocity mercury injection and CT scanning in wells without such experiments.Based on the series capillary bundle model,the theoretical relationship between the pore throat ratio and the change rate of cross-sectional area and porosity of pore and throat before and after overburden pressure is derived.The mathematical equation of pore throat ratio is established.The variables in the equation are determined according to the experimental data of overburden porosity and permeability,and the equation is solved by iterative algorithm.A method for calculating pore throat ratio using overburden porosity and permeability data is established.From this foundation,the core experimental data and conventional logging data are combined to realize the continuous characterization of the hole throat ratio,and the hole throat ratio calculated by logging is in good agreement with the results of core analysis,and can be used for vertical analysis and comparison of single wells.The research results provide a new idea for the further application of pore throat ratio in reservoir evaluation and reservoir development.

关 键 词：岩石孔喉比 覆压孔渗 毛细管束模型 恒速压汞 渗透率 

分 类 号：P631.84[天文地球—地质矿产勘探] TE132.14[天文地球—地质学]