水平低频谐变电偶极子源在地下介质中的电磁响应特征  

Electromagnetic response characteristics of horizontal low-frequencyharmonic electric dipole sources in underground media

作　　者：谢兴兵[1] 徐剑明 周磊[1] 李弘 XIE Xingbing;XU Jianming;ZHOU Lei;LI Hong(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education(Yangtze University),Wuhan 430100,Hubei;Puguang Branch,Zhongyuan Oilfield,SINOPEC,Dazhou 635000,Sichuan;Geophysical Research Institute Co.,Ltd.,SINOPEC,Nanjing 211103,Jiangsu)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [2]中国石油化工股份有限公司中原油田普光分公司,四川达州635000 [3]中石化石油物探技术研究院有限公司,江苏南京211103

出　　处：《长江大学学报（自然科学版）》2023年第6期77-83,共7页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“储层压裂监测中可控源倾子电磁法应用基础研究(41904077)”;“基于井地激电电磁法的储层流体识别方法研究”(42274103);中国石油化工股份有限公司科技部项目“全域电磁法储层含油气性检测技术及应用”(P22163)。

摘　　要：研究水平低频谐变电偶极子在地下介质中产生的电磁场响应特征,不仅可以直观地揭示电磁波在地下介质中的传播和响应分布规律,且在地球物理勘探及地下无线电通讯等领域具有重要的实用价值。从谢昆诺夫势函数出发,利用索墨菲尔德积分及福克积分公式,经过严格的数学推导得到准静态条件下水平低频谐变电偶极子源在地下介质中产生的电磁场的解析表达式。通过与Scripps海洋研究所Kerry Key的数值解计算结果对比,发现无论是电场分量还是磁感应强度分量在整个频段符合度都较高,表明本文解析解推导的水平低频谐变电偶极子源在地下介质中产生的电磁场响应解析表达式的正确性;且解析解的计算速度更快,提高了可控源电磁法三维正演模拟中一次场计算的精度和速度,为可控源电磁法三维正演技术提供了基础支撑。The study of the electromagnetic field response characteristics generated by horizontal low-frequency harmonic electri c dipoles in the underground medium can not only intuitively reveal the propagation rules and distribution of electromagnetic waves in the underground medium,but also has important practical value in the fields of geophysical exploration and underground radio communication.Starting from the Shekunov potential function and using the Sommerfeld integral and the Fock integral formula,the analytical expression of the electromagnetic field generated by the horizontal low-frequency harmonic electric dipole source in the underground media under quasi-static conditions was obtained in this paper after rigorous mathematical derivation.By comparing with the numerical calculation results of Kerry Key from Scripps Oceanographic Institute,both the electric field component and the magnetic induction intensity component match well in the entire frequency band,which indicates the correctness of the analytical expression of the electromagnetic field response generated by the horizontal low-frequency harmonic electric dipole source in the underground media derived by this paper.Moreover,the computational speed of the analytical solution is faster,which will improve the accuracy and speed of primary field calculation in 3D forward simulation of controlled source electromagnetic method,and provide basic support for 3D forward technology of controlled source electromagnetic method.

关 键 词：水平低频谐变电偶极子 均匀半空间 解析解 

分 类 号：TE132.14[石油与天然气工程—油气勘探] P631.325[天文地球—地质矿产勘探]