Acta Geophysica

, Volume 63, Issue 5, pp 1368–1404 | Cite as

Numerical Simulation of Response Characteristics of Audio-magnetotelluric for Gas Hydrate in the Qilian Mountain Permafrost, China

  • Kun Xiao
  • Changchun Zou
  • Changqing Yu
  • Jinyun Pi
Open Access


Audio-magnetotelluric (AMT) method is a kind of frequency-domain sounding technique, which can be applied to gas hydrate prospecting and assessments in the permafrost region due to its high frequency band. Based on the geological conditions of gas hydrate reservoir in the Qilian Mountain permafrost, by establishing high-resistance abnormal model for gas hydrate and carrying out numerical simulation using finite element method (FEM) and nonlinear conjugate gradient (NLCG) method, this paper analyzed the application range of AMT method and the best acquisition parameters setting scheme. When porosity of gas hydrate reservoir is less than 5%, gas hydrate saturation is greater than 70%, occurrence scale is less than 50 m, or bury depth is greater than 500 m, AMT technique cannot identify and delineate the favorable gas hydrate reservoir. Survey line should be more than twice the length of probable occurrence scale, while tripling the length will make the best result. The number of stations should be no less than 6, and 11 stations are optimal. At the high frequency section (10∼1000 Hz), there should be no less than 3 frequency points, 4 being the best number.

Key words

Qilian Mountain permafrost gas hydrate AMT response characteristic numerical simulation 


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Copyright information

© Xiao et al. 2015

Authors and Affiliations

  • Kun Xiao
    • 1
    • 2
  • Changchun Zou
    • 2
  • Changqing Yu
    • 3
  • Jinyun Pi
    • 3
  1. 1.School of Nuclear Engineering and GeophysicsEast China University of TechnologyNanchangPeople’s Republic of China
  2. 2.School of Geophysics and Information TechnologyChina University of Geosciences (Beijing)BeijingPeople’s Republic of China
  3. 3.Institute of GeologyChinese Academy of Geological SciencesBeijingPeople’s Republic of China

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