基于线性回归的饱和度校正法改进  

Improvement of saturation correction method based on linear regression

作　　者：吴伟 毛超杰 张新臣 刘灏亮 张峰 王浩帆 李赫楠 WU Wei;MAO Chao-jie;ZHANG Xin-chen;LIU Hao-liang;ZHANG Feng;WANG Hao-fan;LI He-nan(Research Institute of Logging Application,CNPC Logging Company Limited,Xi'an 710000,China;Research Institute of Exploration and Development,PetroChina Yumen Oilfield Company,Jiuquan 735000,China;Research Institute of Drilling and Production Engineering,PetroChina Yumen Oilfield Company,Jiuquan 735000,China)

机构地区：[1]中国石油集团测井有限公司测井应用研究院,西安710000 [2]中国石油玉门油田分公司勘探开发研究院,酒泉735000 [3]中国石油玉门油田分公司钻采工程研究院,酒泉735000

出　　处：《地球物理学进展》2020年第5期1888-1893,共6页Progress in Geophysics

基　　金：国家自然科学基金项目(41372103);中国石油天然气股份公司专项(2018D-0704)联合资助.

摘　　要：线性回归是校正测量数据系统误差最有效的方法之一,亦被学者应用在取心分析饱和度校正上.传统手段是对地面实测饱和度进行线性拟合,通过拟合线的归一化使饱和度之和为100%,实质是将测量误差用系统误差校正方式处理.但是由于两相流体挥发率的不同等因素影响,岩心取至地面后油、水拟合线的斜率会逐渐发生变化,因此该方法简便但不够严谨.本文提出一种改进的校正方法,首先利用相渗资料计算油、水剩余率,代替传统方法中假设的流体剩余率,将地面测量值拟合线的斜率还原成地下原始状态,然后再用经典的线性回归法进行校正.该方法不但综合考虑了两相流体的渗流特性,而且发挥了线性回归校正法的简便优势,有推广应用价值.Linear regression is one of the most effective methods to correct the systematic error of measurement data,and it is also applied to the saturation correction of coring analysis by scholars.The traditional method is the linear fitting of the measured ground saturation,and the sum of the saturation is 100%by the normalization of the fitting line.In essence,the measurement error is processed by the system error correction.However,due to the different volatilization rate of two-phase fluid and other factors,the slope of oil and water fitting line will gradually change after the core is taken to the ground,so this method is simple but not rigorous enough.In this paper,an improved correction method is proposed.First,the residual rate of oil and water is calculated by using the infiltration data,instead of the fluid residual rate assumed in the traditional method,the slope of the fitting line of the surface measurement value is reduced to the original underground state,and then the classical linear regression method is used for correction.This method not only takes into account the seepage characteristics of two-phase fluid,but also gives full play to the simple advantages of linear regression correction method,which is worth popularizing and applying.

关 键 词：饱和度 分析化验 校正 密闭取心 相渗实验 

分 类 号：P631[天文地球—地质矿产勘探]