Combined 2-D Correction Method and Its Application of Static Shift in MT Data
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摘要: 大地电磁测深法中的静位移是国内外专家十分关注的问题, 虽然提出了多种解决方案, 但各种方法都有其效果与弊端.从大地电磁场基本理论出发, 讨论了大地电磁测深法及其衍生方法的静位移问题, 并提出了一种改进的大地电磁场静位移校正方法, 利用最优估计和迭代的思路将平面聚类法和首枝重合法结合起来, 解决不同成因产生的静位移效应, 并使其完善为能够实现大规模资料处理的方法.使用理论模型响应验证了该方法的正确性, 并且通过实测数据的应用结果与已知信息的对比分析, 验证了方法的有效性.Abstract: The static shift of MT exploration is the issue concerned by domestic and foreign experts, and many correction methods were proposed. But each method has its advantages and disadvantages. In this paper, the static shift of MT and its derivative methods is discussed from the basic theory, and a joint correction method is proposed using the improved plane Hanning window weighting and the first branch coincidence methods. The optimal estimation and iterative methods are used to combine the correction methods for static shift problems with different formations, and the correction method is consummated for realizing large-scale data processing. The correctness of the correction method is verified using the synthetic sounding. And the effectiveness is verified by the comparison of the application results with real data and priori information.
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图 3 带静位移的正演视电阻率曲线
ρs的单位为Ω·m；f的单位为Hz
Fig. 3. The apparent resistivity curve of synthetic sounding with static shift
图 4 校正后的视电阻率曲线
ρs的单位为Ω·m；f的单位为Hz
Fig. 4. The apparent resistivity curve after correction
图 5 静校正前(a)和静校正后(b)的实测视电阻率曲线
ρs的单位为Ω·m；f的单位为Hz
Fig. 5. The apparent resistivity curve of real data before (a) and after (b) correction
图 6 校正前(a)和校正后(b)TM模式视电阻率剖面
图中数值为电阻率，单位为Ω·m；f的单位为Hz
Fig. 6. The TM apparent resistivity cross section before(a) and after (b) correction
图 7 静校正前(a)和静校正后(b)的TM模式平面视电阻率等值线
单位：Ω·m
Fig. 7. The TM apparent resistivity contour map of plane before(a) and (b) correction
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