Nonlinear inversion of surface nuclear magnetic resonance over electrically conductive medium

作者：Weng Ai Hua^*; Wang Xue Qiu; Liu Guo Xing; Mo Xiu Wen; Wang De Li

来源：Chinese Journal of Geophysics, 2007, 50(3): 890-896.

• surface nuclear magnetic resonance
• electrically conductive medium
• nonlinear inversion
• sensitivity matrix
• groundwater exploration

Electrical conductivity impacts the inversion of the data of surface nuclear magnetic resonance (NMR) sounding method. When the effect of electrical conductivity cannot be ignored, the square of the induced voltage of surface NMR can be expressed as a quadratic form involving water content as variables. Further analysis shows that the derivative of the square of the surface NMR voltage with respect to water content is of closed form. This makes nonlinear inversion of surface NMR data possible, and can speed up the inversion significantly. Numerical results show that the water content distribution resulted from nonlinear inversion agrees very well with the true model of both free space and electrically conductive medium.

• 出版日期2007-5
• 单位吉林大学