感应测井视电导率快速高精度算法  

Fast and High Precision Algorithm for Apparent Conductivity of Induction Logging

作　　者：许月晨 陈涛 贺秋利 史超 唐章宏[1] 金鑫[1] XU Yuechen;CHEN Tao;HE Qiuli;SHI Chao;TANG Zhanghong;JIN Xin(Beijing University of Technology,Beijing 100124,China;Technology Center,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710021,China)

机构地区：[1]北京工业大学,北京100124 [2]中国石油集团测井有限公司技术中心,陕西西安710021

出　　处：《测井技术》2020年第5期443-447,共5页Well Logging Technology

基　　金：中国石油科技创新基金研究项目“多频谱电磁波随钻测井多边界探测机理与方法研究”(2016D-5007-0306);“十三五”国家科技重大专项“多维高精度成像测井系列”(2017ZX05019-001);中国石油集团公司项目“感应电场测井研究”(CPL 2016-C01)。

摘　　要：在数值模式匹配法快速算法的基础上,对具有纵向长度分布的感应测井仪器线圈系,通过严格的积分推导获得屏蔽线圈匝数、仪器常数和感应电动势计算的精确表达式,并基于视电导率的定义求解测井响应。根据线圈实际纵向长度,采用划分区间微元的思想,构建了一套基于阵列感应测井仪器计算视电导率的快速高精度积分算法。通过构造拆分算法,提出的算法具有速度快的特点。在实际地层中与传统算法的结果进行对比,结果表明实际测量时不能忽略纵向长度分布带来的误差,提出的算法将显著提高正演和反演的效率。Based on fast algorithm of numerical mode-matching,the exact analytical solutions for turning number of shielding coils,instrument constant and induced electromotive force are given by strict integral method.The coils system are winding in the longitudinal direction and the length can’t be ignored.Then,the log response is calculated based on the definition of apparent conductivity directly.Since the coil length along the longitudinal direction can’t be ignored,this article introduces the idea to divide the length into interval elements and then integrate the interval elements.Furthermore,a fast and accurate integration algorithm for calculating apparent conductivity of array induction logging tool is presented.By constructing a split algorithm,the algorithm proposed has the characteristics of high speed.Compared with the results of the traditional algorithm in the real formation shows that the error caused by longitudinal length distribution cannot be ignored in actual measurement.The algorithm proposed will significantly improve efficiency of forward modeling and inversion.

关 键 词：感应测井 纵向长度分布 屏蔽线圈匝数校正 感应电动势积分算法 视电导率 

分 类 号：P631.84[天文地球—地质矿产勘探]