地面核磁共振信号相位求取电阻率

Inversion of Resistivity by the Phase of SNMR Signal

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.