音频大地电磁法对断层分辨能力的正演模拟及其应用

Forward modeling for fault resolution and its application by audio magnetotelluric method

通过几个模型的正演模拟,在分析不同模型正演响应的TM模式Bostick一维反演断面特征的基础上,探讨了点距、点位、第四系低阻层对AMT法定位断层的影响以及AMT法对断层的位置、倾向、倾角、发育深度等特征的分辨能力。研究表明,在点位和点距布设合理的情况下,AMT法对断层倾向、发育平面位置的推断是可靠的。最后,通过AMT法在太行山区找水的应用实例,验证了正演模拟方法的实用性。

Through forward modeling of several models, and on the basis of analysis the response of TM mode Bostick section features of 1 D inversion cut surface characters, the authors discussed the influence of dot pitch, point location, and Quaternary low resistivity layer on the localized fault by AMT and the resolution capability on the location, dips, dip angle, developmental depth and other char- acteristics by AMT. Studies showed that in the case of reasonable point location and dot pitch, the inference of fault orientation, devel- opmental plane position from AMT was reliable. Finally, through an application case with AMT method to find water in Taihang Mountain area, verified the usefulness of the forward modeling.