长偶极大功率可控源激励下目标体电性参数的频率响应  

Frequency response characteristics of target electric property with long bipole large power control source

作　　者：底青云[1] 王光杰[1] 王妙月[1] 王若[1] 

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院工程地质力学重点实验室

出　　处：《地球物理学报》2009年第1期275-280,共6页Chinese Journal of Geophysics

基　　金：中国科学院重要方向项目(KZCX2-YW-121)资助

摘　　要：利用三维（3D）全空间积分方程准线性解作为数值模拟手段,对包含电离层、大气层和地球介质层的“地-电离层”典型异常目标体多层介质模型进行了数值模拟,得到了偶极源长度100km、电流200A、收发距离远达1600km的合理的异常电性目标体的电阻率-频率响应结果.通过对不同埋深异常目标体的电阻率-频率特征的讨论,认为当考虑电离层和大气层的“地-电离层”大尺度深层横向不均匀复杂介质模拟时,电磁场对深部目标体仍有很好的异常响应,但当异常体电阻率及同一电阻率的岩石埋深不同时,其电阻率-频率的响应特征有很大不同,这正反映了不同岩石物性参数的电阻率-频率响应特征.文中结果表明从长偶极大功率源（WEM）激励的电磁场观测资料区分岩石的电阻率参数是可能的,这为利用WEM观测资料建立电性参数和岩石/地层参数经验关系奠定了基础.We simulate models of anomalous body imbedded in multi-layered medium that include the ionosphere,the atmosphere,and the earth medium by using 3D quasi-linear integral equation method in whole space,and obtain the reasonable resistivity-frequency response of the anomalous body when the bipole length is 100 km,the current is 200 A and the transmitter-receiver space is 1600 km.Through the discussion of the character of resistivity-frequency curves of the targets buried in different depth,we draw the conclusion that the electromagnetic field of the deeply buried anomalous body can be got perfectly when considering the horizontal inhomogeneous complex medium including the large-scale ionosphere and the atmosphere.But the resistivity-frequency responses are different from each other when the resistivity and the buried depth of the anomalous body are variable,which demonstrate the character of the resistivity-frequency of different kind of rock.The results in the paper show that it is possible to distinguish the resistivity of rock from the observed data due to the bipole large power control source（WEM）,and the research establishing the basis of the relationship between the electric parameter and rock/medium parameter using WEM observed data.

关 键 词：长偶极 大功率 远距离 岩石物性 电阻率-频率响应 

分 类 号：P631[天文地球—地质矿产勘探]