Ming Zhang

• Doctor of Philosophy
• Jilin University

Trial-and-error modeling may provide some level of interpretation of the subsurface while sacrificing certainty, and certainty it is a viable alternative for precise three-dimensional (3D) interpretation of real ground-airborne frequency-domain electromagnetic (GAFEM) data. Therefore, a semiautomatic trial-and-error modeling approach has been prese...

This paper proposes a procedure of forward modeling three-dimensional frequency-domain wire-source electromagnetic data using the meshless generalized finite-difference (MGFD) method. This method is based on Taylor series expansions and the weighted least squares method, and its basic principle is to express the partial derivatives of the unknown f...

Investigation of three-dimensional forward modeling for the ground-airborne frequency-domain electromagnetic (GAFEM) method and the characterization of its responses are presented. The electric field Helmholtz equation in the frequency domain is discretized by the Galerkin weighted residual method. The secondary electric field is the unknown to be...

An investigation of forward modeling 3‐D wire source electromagnetic data in the frequency domain using nodal and edge finite‐element basis functions is presented. The equations solved are those for the coupled secondary vector‐scalar potentials (i.e., magnetic vector potential A and electric scalar potential φ) which give rise to a less ill‐condit...

Although most electromagnetic (EM) data can be inverted to actual resistivity, ways of quickly getting a real‐time interpretation of a data set are still valuable. Such methods are useful when we are testing instrumentation or assessing data quality during a survey, or when we need to get a general understanding of the geological structure during a...

The ground–airborne frequency–domain electromagnetic (GAFDEM) method is a recently developed rapid detection approach for underground structures. However, the conventional apparent resistivity imaging in this method cannot meet the requirements of high precision and high efficiency detection for 3D targets. Therefore, we introduce the divergence of...

The ground–airborne frequency-domain electromagnetic (GAFDEM) survey is a fast method to detect the deep underground structure in areas with difficult access. However, the suspended coil sensor in the survey system experiences attitude changes, which inevitably yield attitude error on the measured magnetic field and result in false apparent resisti...

Studying how to improve the boundary recognition ability and resolution of anomalies is of great significance in the electromagnetic prospecting method. This paper analyzes the response characteristics of gradient data from the frequency-domain controlled-source electromagnetic method. A survey geometry that has one transmitter and many receiver lo...

For surveys in areas with difficult access, ground-based electromagnetic (EM) systems are difficult to operate, time-consuming, and expensive, whereas airborne EM (AEM) systems are unsafe and uneconomic for small survey areas. We have developed a new frequency-domain airborne electromagnetic (FAEM) system called the ground-airborne frequency-domain...