| Description |
The electrical induced polarization (EIP) method has been used in mineral exploration for over half a century, but its application was limited due to the relatively high cost involved and a requirement of using a galvanic source and receivers having a direct contact with the ground. In order to overcome these limitations, the magnetic induced polarization (MIP) method was introduced. However, interpretation of the MIP data in a complex three-dimensional (3D) environment represents a very challenging problem. In this thesis, a new method of interpretation of 3D MIP data was introduced based on the generalized effective medium theory of induced polarization (GEMTIP). The GEMTIP model was established to describe the induced polarization (IP) effect in complex heterogeneous rock samples. I have incorporated the GEMTIP model with the integral equation (IE) method to simulate the magnetic field caused by the IP effect. I have also developed an inversion algorithm based on the regularized conjugate gradient method. The inversion produces a 3D distribution of the four parameters of the GEMTIP model-matrix conductivity (σ0) (or DC resistivity ρ0= 1/σ0), fraction volume (f), time constant (t), and relaxation parameter (C). The developed methods and computer codes were tested on synthetic MIP data. I have also applied this new method for interpretation of the synthetic MIP data computer simulated for the real geological structure of the Silver Bell area in Arizona. |
