线源时间域垂直磁场全区视电阻率求解  

The solution of all-time apparent resistivity in time domain with vertical magnetic field

作　　者：赵福元 周磊[2] 李宁生 仵阳 虎新军 安百州 ZHAO Fuyuan;ZHOU Lei;LI Ninsheng;WU Yang;HU Xingjun;AN Baizhou(Ningxia Institute of Geophysical and Geochemical Exploration,Yinchuan,750001,China;Yangtze University,Key Laboratory of Exploration Technologies for oil and Gas Resources, Wuhan 430100,China)

机构地区：[1]宁夏回族自治区地球物理地球化学勘查院,银川750001 [2]长江大学油气资源与勘探技术教育部重点实验室,武汉430100

出　　处：《物探化探计算技术》2020年第2期253-259,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：宁夏回族自治区地质局创新团队(2017-1-3)。

摘　　要：目前线源一维的正、反演在国内、外研究尚少,大多数研究的都是二维问题。这里通过研究一维条件下时间域线源的场值和电阻率之间的关系,发现垂直磁场与电阻率之间是单值的关系,此时定义的全区视电阻率具有唯一性和可靠性。因此以垂直磁场定义全区视电阻率,然后利用二分搜索算法进行全区视电阻率求解。模拟结果表明:对于时间域线源垂直磁场而言,在较远区早期的数据计算不精确,当收发距越小时早期的数据越好,而晚期结果则一直都很稳定。分析后初步认为是计算精度导致的结果。最后加入了5%的随机噪声后与无噪声的结果进行对比,得到收发距与最小可接受起始观测时间的关系。At present,the study on 1-D forward and inversion is not so far applied because most of them are 2-D problems.In this paper,theoretical calculations indicates that the vertical magnetic field components are one-to-one correspondence with resistivity in one-dimensional conditions,which makes the definition of all-time apparent resistivity unique and reliable.We then define all-field apparent resistivity using the vertical magnetic field with the binary search algorithm to solve the apparent resistivity.Simulation results show that,for the line-source vertical magnetic field,it is difficult to compute the early-time data in the far area.When the transmitter-receiver distance reduces gradually,the early effect becomes better and the late-time results are always stabling.After analysis the results,we preliminary consider to the reason that is calculation accuracy.We obtain the relationship between minimum acceptable starting observation time and transmitter-receiver distance by adding 5%random noise and comparing with the theoretical results.

关 键 词：时间域 全区视电阻率 垂直磁场 

分 类 号：P631.2[天文地球—地质矿产勘探]