任意角度瞬变电磁测深正演问题计算方法

针对目前比较普遍的瞬变测深晚期场计算精度较低的情况,本文依据频率域电磁场实虚分量的奇偶性及付氏变换的导数性质,利用余弦变换实现了由频率域到时间域电磁场的转换。计算表明,本算法计算晚期瞬变电磁及视电阻率响应具有较高的精度。文中重点计算了单一偶极供电,多点测量的任意角度瞬变测深的正演问题,并对其规律性作了总结。

ALGORITHM OF DIRECT PROBLEM IN TRANSIENT ELECTROMAGNETIC SOUNDING OF ARBITRARY ANGLE

In view of the fact that the calculation precision Of the late stag6 field of the transient sounding ig commonly rather low, the present paper, on the basis of the odd-even character of the real and imaginary components of the frequerey domain electronagnetic field and the derivative character of the Fourler transform and using cosine transform, has realized the conversion of the electromagnetic field from the frequency domain to the time domain. It is shownthat the calculation of late-stage transient electromagnetic and apparent electrical resistivity with this algorithm has relatively high precision. This paper has emphatically dealt with the direct problem in arbitrary angle transient electromagnetic sounding of single dipole power supply multipoint measurement; and summed up its regularity.