一种砂岩储层渗透率计算新方法

A New Method for Calculating Permeability of Sandstone Reservoir

于华 令狐松 王谦 郭庆明 伍莹

YUHua LINGHUSong WANGQian GUOQingming WUYing

中国石油集团测井有限公司技术中心, 陕西 西安 710077 中国石油集团测井有限公司测井应用研究院, 陕西 西安 710077

Technology Center, China Petroleum Logging Co. Ltd., Xi'an, Shaanxi 710077, China Logging Applications Institute, China Petroleum Logging Co. Ltd., Xi'an, Shaanxi 710077, China

储层渗透率是油田开发中的重要参数，它是确定合理开采方案、优化完井射孔方案及选择最佳排液位置的基础，通常岩芯统计分析法计算的渗透率误差较大，缺乏理论性，适用范围小。针对该问题以串联毛管模型为基础，理论推导了储层微观结构参数与孔隙度、渗透率、地层因素的数学关系，创新性地构建了孔喉直径比的数学物理方程，建立了基于孔隙度、孔喉直径比、喉道直径的储层微观结构参数渗透率理论模型，明确了渗透率的微观物理影响因素。在岩芯实验、测井资料、渗透率理论模型的基础上，建立了一套渗透率计算新方法。结果显示，渗透率计算结果与岩芯分析结果一致性较好，满足了精确评价储层渗透率的需求。研究表明，把岩电参数、孔隙度引入到评价孔喉微观结构参数中，从数学物理角度明确了储层渗透率是微观孔喉结构参数的宏观表征，研究结果为油藏开发中储层渗透率评价提供了一种新的途径。

Reservoir permeability is an important parameter in oilfield development. It is the basis for determining reasonable exploitation scheme, optimizing completion perforation scheme and selecting the optimal drainage position. The common core statistical analysis method is of errors in permeability calculation and is of a small scope of theoretical applicability. To solve this problem, based on the serial capillary model, the mathematical relationship between reservoir microstructure parameters and porosity, permeability and formation factors is theoretically derived. The mathematical and physical equations of pore throat diameter ratio are established, and the theoretical calculation model of permeability based on porosity, pore throat diameter ratio and throat diameter reservoir microstructure parameters is established, and the micro physical influencing factors of permeability are clarified. Based on core experiment, logging data and permeability theoretical model, a new permeability calculation method is established. The results show that the permeability calculation results are in good agreement with the core analysis results, and meet the needs of accurate evaluation of reservoir permeability. The results show that the permeability of reservoir is the macro characterization of the micro pore throat structure parameters from the mathematical and physical point of view, and the research results provide a new way for the permeability evaluation of reservoir development.

10.11885/j.issn.1674-5086.2019.03.01.01