Comparing resistivity models from 1D, pseudo-2D and pseudo-3D Occam’s inversion of FHEM data
عنوان دوره: نوزدهمین کنفرانس ژئوفیزیک ایران
کد مقاله : 1698-NIGS
نویسندگان
1استادیار و عضو هیات علمی / دانشگاه یزد
2Tehran University
3سازمان زمین شناسی سوئد، اپسالا، سوئد
چکیده
The Frequency-domain helicopter-borne electromagnetic (FHEM) applications are industrially feasible, as long as there is a fairly fast algorithm which is accurate enough for inversion of the tremendous amount of survey data. In the present study a comparison between 1D, pseudo-2D, and pseudo 3D Occam’s inversions has been made with analysis of data from field data set acquired in the north of central Iran. In 1D Occam’s inversion approach the model regularization contains only vertical smoothing constraints with sharp layer interfaces in the horizontal direction. In pseudo-2D Occam’s inversion, 1D Occam’s inversions could be horizontally constrained with each other along a flight line. Finally, 1D Occam’s inversion regularized through 3D constraints on resistivity structure. The results show that pseudo-3D Occam’s inversion gives fewer inversion artifacts, better model recognition, smoother, and more continuous models and are effectively reducing the effects of data noise.
کلیدواژه ها
Electrical resistivity؛ FHEM data؛ 1D Occam’s inversion؛ Pseudo-2D Occam’s inversion؛ Pseudo-3D Occam’s inversion
Title
Comparing resistivity models from 1D, pseudo-2D and pseudo-3D Occam’s inversion of FHEM data
Authors
Hosseinali Ghari, Behrooz Oskooi, Mehrdad Bastani
Abstract
The Frequency-domain helicopter-borne electromagnetic (FHEM) applications are industrially feasible, as long as there is a fairly fast algorithm which is accurate enough for inversion of the tremendous amount of survey data. In the present study a comparison between 1D, pseudo-2D, and pseudo 3D Occam’s inversions has been made with analysis of data from field data set acquired in the north of central Iran. In 1D Occam’s inversion approach the model regularization contains only vertical smoothing constraints with sharp layer interfaces in the horizontal direction. In pseudo-2D Occam’s inversion, 1D Occam’s inversions could be horizontally constrained with each other along a flight line. Finally, 1D Occam’s inversion regularized through 3D constraints on resistivity structure. The results show that pseudo-3D Occam’s inversion gives fewer inversion artifacts, better model recognition, smoother, and more continuous models and are effectively reducing the effects of data noise.
Keywords
Electrical resistivity, FHEM data, 1D Occam’s inversion, Pseudo-2D Occam’s inversion, Pseudo-3D Occam’s inversion