Publication Date:
2018-06-21
Description:
Geosciences, Vol. 8, Pages 225: A Numerical 1.5D Method for the Rapid Simulation of Geophysical Resistivity Measurements Geosciences doi: 10.3390/geosciences8060225 Authors: Mostafa Shahriari Sergio Rojas David Pardo Angel Rodríguez-Rozas Shaaban A. Bakr Victor M. Calo Ignacio Muga In some geological formations, borehole resistivity measurements can be simulated using a sequence of 1D models. By considering a 1D layered media, we can reduce the dimensionality of the problem from 3D to 1.5D via a Hankel transform. The resulting formulation is often solved via a semi-analytic method, mainly due to its high performance. However, semi-analytic methods have important limitations such as, for example, their inability to model piecewise linear variations on the resistivity. Herein, we develop a multi-scale finite element method (FEM) to solve the secondary field formulation. This numerical scheme overcomes the limitations of semi-analytic methods while still delivering high performance. We illustrate the performance of the method with numerical synthetic examples based on two symmetric logging-while-drilling (LWD) induction devices operating at 2 MHz and 500 KHz, respectively.
Electronic ISSN:
2076-3263
Topics:
Geosciences
