Application of Semi-Airborne Transient Electromagnetic Method in Ancient River Area

Abstract Semi-airborne transient electromagnetic method (SATEM) is a new type of transient electromagnetic measurement method. Compared with the ground transient electromagnetic system, the system has the characteristics of convenience, high efficiency, large detection range, repeatable observation, high lateral resolution, etc. At the same time, this ground-space model shows that this method is suitable for detecting missions in mountainous and undulating terrain, and has obvious advantages in dividing underground space structure. In this paper, the theory of semi-airborne transient electromagnetic method is systematically studied and forward modeling is used to simulate the diffusion law of the end value under different resistivity and the characteristics of the response curve under different influencing factors of G model. The identification capability of SATEM for multi-layer model is verified by theoretical inversion, which lays a foundation for the practical application of SATEM in an ancient river channel. Finally, the application of SATEM to an example of an ancient river channel verifies the practicability and efficiency of the method, and the detection results are in good agreement with the local geological data.