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基于全空间瞬变电磁理论,研究了不同发射线圈尺寸、不同采样时刻对电阻率求解唯一性的影响。然后将晚期视电阻率值作为求解初值,计算对应的归一化感应电动势,并计算其与实测值的差值,运用此差值对归一化感应电动势计算值进行补偿,提出全区视电阻率差值补偿算法。最后通过1、10、100Ωm电阻率理论模型计算,验证该算法在较少的迭代次数下可较大提高计算精度;实测资料处理结果表明,与半空间晚期计算方法相比,该算法具有较好的应用效果。
Based on the theory of full-space transient electromagnetic field, the effects of different transmitting coil sizes and different sampling times on the uniqueness of resistivity solution are studied. Then the late apparent resistivity value is taken as the initial value of the solution, the corresponding normalized induced electromotive force is calculated, and the difference between the normalized induced electromotive force and the measured value is calculated, and the calculated value of the normalized induced electromotive force is compensated. Resistivity difference compensation algorithm. Finally, the theoretical model of resistivity of 1, 10, 100Ωm is calculated to verify that the algorithm can greatly improve the calculation accuracy with fewer iterations. The measured data processing results show that the algorithm has better performance than the late half-space method The application effect.