地面核磁共振信号相位求取电阻率  

Inversion of Resistivity by the Phase of SNMR Signal

作　　者：彭耀[1,2] 李凡[2] 潘剑伟[2] 李振宇[2] 

机构地区：[1]湖北省地质局武汉水文地质工程地质大队,武汉430051 [2]中国地质大学(武汉)地球物理与空间信息学院,武汉430074

出　　处：《CT理论与应用研究（中英文）》2016年第1期41-47,共7页Computerized Tomography Theory and Applications

基　　金：天然气水合物勘查与试采专项(GZHL20110304;GZHL20110324)

摘　　要：椭圆极化现象是电磁场在导电介质中传播时产生的,为得到准确的相位信息,在计算激发磁场时应考虑椭圆极化。本文研究了地面核磁共振(SNMR)信号相位求取电阻率的基本方法,利用SNMR信号通过广义逆反演法得到电阻率未知情况下的含水率及层位分布,作为相位反演电阻率的先验值,通过模拟退火法实现对电阻率的反演。对SNMR的研究解决了通过相位对电阻率的求取,有利于进一步利用相位信息提高含水层和含水率反演的精度。The elliptic polarization, which is occur with the electromagnetic field in conductive media communication, must been taken into consideration when calculate the magnetic field excitation, In order to get the accurate phase information. In this paper, the basic method of calculating the resistivity by the phase of SNMR which is been studied. Proposed that treat the aquifer and the water content, which are inversed with the Generalized method under the condition of resistivity is unknown, as a priori value in the inversion of resistivity by the phase with the simulated annealing method. The study solved the calculating of resistivity by the phase, which is helpful to further use the phase information and to improve the accuracy of the aquifer and water content in inversion.

关 键 词：地面核磁共振 相位 反演 电阻率 

分 类 号：P631.3[天文地球—地质矿产勘探]