Assessment of Electromagnetic Frequency Sounding Problem in a Near Surface Geological Environment
Quang Hiep Vu, Meijing Li, and Keun Ho Ryu†
Database/Bioinformatics Laboratory, Chungbuk National University, 12 Gaeshindong, Heungduk-gu, Cheongju, Chungbuk 361-763, Korea
Understanding what exists and happens beneath the Earth’s surface could help human being make better decision in life and production. This paper introduces depth sounding based on artificial magnetic variation in a near-surface geological environment. We focus on solving the forward problem of electromagnetic frequency sounding. First, work on vertical geoelectric layers based on variation in electromagnetic fields is investigated based on the depth and the skin-effect. The skin-effect in the time domain is examined for when the frequency of electromagnetic field decreases, the eddy current would penetrates deep into the environment. Based on this background, we construct a model for solving the frequency electromagnetic sounding problem. This model allows us to detect changes in conductivity related to the Earth’s shell depth versus electromagnetic measurement at one place on the Earth’s surface. A simulation tool is then implemented using MATLAB. This model is expected to contribute especially to teaching in the field of geophysics and to be applied widely in areas such as geological map drawing, structural study, and engineering geology and hydrogeology.
-  N. V. Pham, Q. T. Lam, T. A. Ton, S. Nguyen, and N. L. Tran, “Exploration geophysics,” Secondary education & University press, 2005.
-  Q. H. Ta, “Lecture notes on Ocean exploration,” Department of geophysics, Faculty of Physics, College of natural science, Vietnam National University, 2011.
-  N. C. Nguyen and V. D. Le, “A study on magnetic sounding methods based on mathematical models,” In Proc. of the 4th Conf. on national physics, Hanoi, 1993.
-  ASTMD6429-99, “Standard Guide for Selecting Surface Geophysical Methods,” ASTM International.
-  P. Keary, M. Brooks, and I. Hill, “An Introduction to Geophysical Exploration,” 3rd edition Blackwell Science, 2002. ISBN: 063204929
-  J. R.Wait, “Electromagnetic Waves in Stratified Media,” New York, USA, 1962.
-  A. N. Tikhonov, “Equations of mathematical physics,” General publishing company, Canada, 1963.
-  P. Krylstedt, J.Mattsson, and A. Tikhonov, “Numerical modeling of EM frequency sounding in marine environments,” in Proc. 3rd Int. Conf. Marine Electromagnetics, Stockholm, Sweden, 2001.
-  A. N. Tikhonov, J. Mattsson, P. Krylstedt, and M. V. Klibanov, “A sequential approach to inverse modeling in marine electromagnetics: Recovering the conductivity profile from measurements of the electromagnetic field,” in Proc. 3rd Int. Conf. Marine Electromagnetics, Stockholm, Sweden, 2001.
-  M. V. Klibanov and A. N. Tikhonov, “Carleman Estimates for Coefficient Inverse Problems and Numerical Applications,” VSP, Utrecht, 2004.
-  A. Tamasan and A. Timonov, “On a new approach to frequency sounding of layered media,” Num. Funct. Anal. Optim., 2008.
-  A. Nachman, A. Tamasan, and A. Timonov, “Recovering the conductivity from a single measurement of interior data,” Inverse Problems, 2009.
-  A. Linkova, “Double frequency sounding of liquid precipitation,” Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW), 2010.
-  E. L. Wallin, “Sensitivity of the High to Variations In Electrical Properties,” U.S. Geological Survey, Society of Exploration Geophysicists, 2010.
-  H. M. Basir and A. Javaherian, “Multi attribute ant-tracking for fault detecting: A case study of an Iranian oilfield,” Istanbul International Geophysical Conf. and Oil & Gas Exhibition, Istanbul, Turkey, 2012.
-  J. D. Abraham, P. A. Bedrosian, T. H. Asch, L. B. Ball, J. C. Cannia, J. D. Phillips, and S. Lackey, “Evaluation of Geophysical Techniques for the Detection of Paleochannels in the Oakland Area of Eastern Nebraska as Part of the Eastern Nebraska Water Resource Assessment,” Scientific Investigations Report, 2011.
-  A. Kiani and A. Javaherian, “Phase inversion deconvolution in seismic data processing,” 72nd EAGE Conf. & Exhibition incorporating SPE EUROPEC 2010, Barcelona, 2010.
-  M. Parise, “Fast Computation of the forward solution in controlledsource electromagnetic sounding problems,” Progress In Electromagnetics Research, Vol.111, pp. 119-139, 2011.
-  T. A. Ton, “Numerical methods,” Mathlab, Vietnam National University press, Hanoi, 2001.
-  http://en.wikipedia.org/wiki/File:Log_paper.svg [Accessed April 19, 2013]