Problem of date interpretation from the view of principle of controlled-source audio-frequency magnetotellurics
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摘要: 从频率电磁测深原理出发,说明了人工源频率测深的电磁场存在3个场区,也只有远区场的可控源音频大地电磁测深(CSAMT)法的资料才能用音频大地电磁测深(AMT)法进行反演解释。对于存在中近区的CSAMT法资料,可进行近场校正,然后按AMT法解释。由于近场校正是建立在均匀半空间模型之上,校正误差大。为此提出了不加校正直接对比值视电阻率数据进行反演解释,最好按电磁场单分量资料解释,以减少不必要的校正误差。
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关键词:
- 音频大地电磁测深 /
- 可控源音频大地电磁测深 /
- 比值视电阻率 /
- 近场校正 /
- 电磁场单分量
Abstract: The paper, from the principle of frequency souding, ilustrates that there are three field zones for frequency souding of artificil source, far-field data of controlled-source audio-frequency magnetotellurics (CSAMT) were interpreted by audio-frequency magnetotellurics (AMT). After data in near-fied has ben corrected, it is interpreted by AMT. Because near-field conrrection is based on homogeneous half-space mode,so correction error is bigger. Therefor,it is presented that data of ratio apparent risistivity without correction or data of single component of electromagnetic field are directly interpreted by inversion. -
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