%0 Journal Article
%T Nonlinear inversion of surface nuclear magnetic resonance over electrically conductive medium<br>导电性影响的地面核磁共振反演
%A WENG Ai_Hua
%A WANG Xue_Qiu
%A LIU Guo_Xing
%A MO Xiu_Wen
%A WANG De_Li
%A <br>翁爱华
%A 王雪秋
%A 刘国兴
%A 莫修文
%A 王德利
%J 地球物理学报
%D 2007
%I 
%X 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.
%K Surface nuclear magnetic resonance
%K Electrically conductive medium
%K Nonlinear inversion
%K Sensitivity matrix
%K Groundwater exploration<br>地面核磁共振
%K 导电性
%K 非线性反演
%K 灵敏度矩阵
%K 找水
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=C4A56F33949A03AE&yid=A732AF04DDA03BB3&vid=771152D1ADC1C0EB&iid=38B194292C032A66&sid=38DB5AF4AD8FDCCA&eid=B65E5C7BA0DC04DC&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=9&reference_num=21