1D joint inversion of frequency-domain and time-domain MCSEM data in marine shallow waters

YUE Mingxin1,2,3 WU Xiaoping1,3

(1.Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China 230026)
(2.Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Ministry of Education, Wuhan, Hubei, China 430100)
(3.Mengcheng National Geophysical Observatory, Mengcheng, Anhui, China 233500)

【Abstract】1D forward modeling of marine electromagnetic (MCSEM) data shows that both frequency-domain data and time-domain data have certain limitations when using a horizontal electric dipole as the emission source in shallow water. In order to better use MCSEM for offshore oil and gas exploration, we acquire frequency-domain and time-domain data at the same time based on the idea of the time-frequency electromagnetic (TFEM) method used on land. We achieve 1D joint inversion of time-domain and frequency-domain electromagnetic data with the regularization inversion method. According to our model data tests, for a deep reservoir model with 300 m water depth, inverted frequency-domain data can show reservoir location and resistivity, but additional time-domain data cannot improve resolution; for a deep reservoir model with 100 m water depth, the joint inversion results are better than that of a single domain data set.

【Keywords】 marine controlled-source electromagnetic method; time domain; frequency domain; joint inversion;

【DOI】

【Funds】 National Natural Science Foundation of China (41374076, 41130420) National major scientific instrument equipment development project (2011YQ050060) National High Technology Research and Development Program (863 Program) of China (2012AA061403, 2012AA09A201) National Special Project “Natural gas hydrate resource exploration and pilot production project” (GZH201400305) Open fund project (K2016-08) of Key laboratory of oil and gas resources and exploration technology of the Education Ministry (Yangtze University)

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    References

    [1] Constable S, Srnka L J. An introduction to marine controlled-source electromagnetic methods for hydrocarbon exploration. Geophysics, 2007, 72 (2): WA3–WA12.

    [2] Constable S. Ten years of marine CSEM for hydrocarbon exploration. Geophysics, 2010, 75 (5): A67–A81.

    [3] He Zhanxiang, Yu Gang. Marine EM survey technology and its new advances. Progress in Exploration Geophysics, 2008, 31 (1): 2–9 (in Chinese).

    [4] He Zhanxiang, Sun Weibin, Kong Fanshu, et al. Marine electromagnetic approach. OGP, 2006, 41(4): 451–457 (in Chinese).

    [5] Weiss C J. The fallacy of the “shallow-water problem” in marine CSEM exploration. Geophysics, 2007, 72(6): A93–A97.

    [6] Edwards R N, Chave A D. A transient electric dipoledipole method for mapping the conductivity of the sea floor. Geophysics, 1986, 51 (4): 984–987.

    [7] Cheesman S J, Edwards R N, Chave A D. On the theory of sea-floor conductivity mapping using transient electromagnetic systems. Geophysics, 1987, 52 (2): 204–217.

    [8] Li Yuguo, Steven C. Transient electromagnetic in shallow water: Insights from 1D modeling. Chinese Journal of Geophysics, 2010, 53 (3): 737–742 (in Chinese).

    [9] Kaufma, A A. Frequency-domain and time-domain electromagnetic survey. Beijing: Geological Publishing House, 1987, 253–254 (in Chinese).

    [10] Li Zhizhong, Zhao Hongwei, Zhou Chang, et al. China offshore oil and gas production and its potential analysis. Energy of China, 2015, 37(4): 41–44 (in Chinese).

    [11] Liu Guangding, Chen Jie. On China’s oil and gas “MDO strategy”. Progress in Geophysics, 2011, 26 (1): 1–20 (in Chinese).

    [12] Zhao Zhi, He Zhanxiang, Yang Shujiang, et al. New progress and case study of time and frequency electromagnetic technology. The Chinese Geophysics 2010–26th Annual Conference of Chinese Geophysical Society, and Collected Papers of 13th Academic Conference of Seismological Society of China, 2010 (in Chinese).

    [13] Liu Jianxin, Tang Wenwu, He Zhanxiang, et a1. Study on joint inversion method of one-dimensional time-domain magnetic field and frequency-domain electric field. Progress in Geophysics, 2011, 26 (6): 2 011–2 017 (in Chinese).

    [14] Stoyer C H. Electromagnetic fields of dipoles in stratified media. IEEE Transactions on Antennas and Propagation, 1977, 25 (4): 547–552.

    [15] Guptasarma D, Singh B. New digital linear filters for Hankel J0 and J1 transforms. Geophysical Prospecting, 1997, 45(5): 745–762.

    [16] Wang Huajun. Digital filter algorithm of the sine andcosine transform. Chinese Journal of Engineering Geophysics, 2004, 1 (4): 329–335 (in Chinese).

    [17] Tikhonov A N and Arsenin VIA. Solutions of Illposed Problems. Winston,Washington DC, 1977.

    [18] Constable S C, Parker R L, Constable C G. Occam’s inversion: A practical algorithm for generating smoothmodels from electromagnetic sounding data. Geophysics, 1987, 52 (3): 289–300.

    [19] Key K. 1D inversion of multicomponent, multifrequency marine CSEM data: Methodology and synthetic studies for resolving thin resistive layers. Geophysics, 2009, 74 (2): F9–F20.

    [20] Ji Wei. The study of one-dimensional joint inversion for time- and frequency-domain CSEM data [Dissertation]. Changsha, Hunan: Central South University, 2012 (in Chinese).

    [21] Dai Yijun, Tang Wenwu, Cao Chuanghua. Time-frequency joint inversion in electromagnetic method of horizontal layered medium. Computing Techniques for Geophysical and Geochemical Exploration, 2013, 35 (1): 18–22 (in Chinese).

This Article

ISSN:1000-7210

CN: 13-1095/TE

Vol 52, No. 03, Pages 612-617+8

June 2017

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Article Outline

Abstract

  • 1 Introduction
  • 2 Methodology
  • 3 Theoretical model inversion
  • 4 Conclusions
  • Appendix A
  • References