频率域双极源全区视电阻率的计算及分析  

The calculation and analyzing of the bipolar source all time apparent resistivity in frequency domain

作　　者：刘颖[1,2] 柳建新[1] 何展翔 童孝忠[1] 

机构地区：[1]中南大学,长沙410083 [2]东方地球物理公司,涿州072751

出　　处：《地球物理学进展》2011年第2期675-686,共12页Progress in Geophysics

基　　金：国家自然科学基金资助项目(60672042);教育部博士点基金资助项目(20070533102)资助

摘　　要：频率域可控源电磁法由于其发射源的非偶极性,收发距受到发射场源功率的限制,在近区和过渡区,场源不能看做偶极子源,而是双极源.对于双极源数据在近区和过渡区的校正,若采用偶极子源校正,存在很大的误差,收发距一定时,偶极距越大,误差越大.双极源全区视电阻率利用半空间模型视电阻率等效地下复杂模型视电阻率计算全区视电阻率,对比偶极子定义的全区视电阻率,能够正确的反应地下情况.Frequency domain controlled-source electromagnetic method is non-dipole characteristic. The space between receiver and transmitter is limited by the Power of the transmitters. So dipole field source cannot be seen as the field, but bipolar field, in the nearby and the transition region. For the bipolar source dat＇s correction in the nearby and transition region, with a dipole source correction, it is a big error. The space between receiver and transmitter is changeless, then the greater dipole moment, the greater error. Bipolar source all time apparent resistivity, which is defined with apparent resistivity in the half-space model, is equivalent to underground complex models. And comparing with the definition of the dipole~ s all time apparent resistivity, which can reflect ground conditions correctly. At last a few models prove that this method is effective and correct.

关 键 词：双极源 一维全区正演 汉克尔变换 

分 类 号：P631[天文地球—地质矿产勘探]