基于微元动态物质平衡法模型确定水淹层混合液电阻率  

Determining Mixed Liquid Resistivity of Water-Flooded Reservoir Based on Micro-Element Dynamic Material Balance Model

作　　者：秦敏 申辉林 丁磊 刘欢 黄信雄 章利民 Qin Min;Shen Huilin;Ding Lei;Liu Huan;Huang Xinxiong;Zhang Limin(School of Geosciences,China University of Petroleum,Qingdao 266580,Shandong,China;Zhanjiang Branch of CNOOC Ltd,Zhanjiang524057,Guangdong,Chi)

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《吉林大学学报（地球科学版）》2020年第3期919-928,共10页Journal of Jilin University：Earth Science Edition

基　　金：中海石油(中国)有限公司项目(YXKY-2014-ZJ-01)。

摘　　要：水淹层测井评价关键技术之一就是精确计算水淹层混合液电阻率,目前精确计算水淹层混合液电阻率的方法精度亟需提高。为此,本文提出精确计算地层混合液电阻率的微元动态物质平衡法。该方法将水驱油过程微元化,并考虑到水驱油过程中地层原生水与注入水离子有效交换比例这个变量,理论上该变量随水淹程度的增强从0逐渐变为1。对比结果表明,一阶导电法、变倍数物质平衡法和改进的微元动态物质平衡法模拟计算岩石电阻率的平均相对误差分别为0.192、0.169和0.124,改进的微元动态物质平衡法精度有了较大的提高,并且得到的混合液电阻率在不同水淹类型测井评价中可以更精确地计算剩余油饱和度。该方法已推广应用到各大油田不同水淹类型测井评价中,计算的水淹层含水饱和度与密闭取心的饱和度数据最为接近,水淹层测井综合解释符合率达到87%以上。One of the key techniques for logging evaluation of water-flooded reservoir is to determine the resistivity of the mixed liquid of water-flooded reservoir.At present,the method of calculating the resistivity of the mixed liquid of water-flooded reservoir needs to be improved.In this paper,a dimensional dynamic material balance method is proposed to accurately calculate the resistivity of formation mixed fluid.The method makes the water flooding process microelement and takes into account the variable exchange ratio of original water and the injected water ions in the water flooding process.In theory,the variable gradually changes from 0 to 1 with the increase of flooding degree.The comparison results show that the average relative errors of the rock resistivity calculated by the first derivative method,the variable magnification material balance method,and the improved micro-element dynamic material balance method are 0.192,0.169,and 0.124 respectively.The improved micro-element dynamic material balance method is more accurate when measuring the mixed solution resistivity in different flooding types.The residual oil saturation can be calculated more accurately in well evaluation.The method has been applied to the well logging evaluation of different flooding types in major oil fields.The calculated water saturation of water-flooded reservoir is the closest to the saturation data of the closed coring.The comprehensive interpretation coincidence rate of the flooded reservoir logging reaches more than 87%.

关 键 词：水淹层 水驱油动态模型 混合液电阻率 微元动态导电机理 

分 类 号：P631.84[天文地球—地质矿产勘探]