In order to extend the construction field of the wide field electromagnetic method and break through the restricted area of the wide field electromagnetic method application under extremely cold conditions, the authors studied the experimental technology of wide field electromagnetic method under extremely cold conditions. A comparative test was carried out between the exposed permafrost in spring and the extremely cold conditions and the exposed permafrost and the unexposed permafrost in the extremely cold conditions. The feasibility of construction under extremely cold conditions was explored. Various warm-keeping methods and measures to overcome the high resistance of frozen soil layers were applied in practice, and a set of exploration technological means under extremely cold conditions were summarized,which can be used to carry out the wide field electromagnetic method construction under extremely cold conditions so as to ensure the quality of data.
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ZHAN Shao-Quan, LI Ai-Yong, WANG Dao-Li, HAO Hong-Lei, WANG Lei. A study of the wide field electromagnetic method under extremely cold conditions. Geophysical and Geochemical Exploration, 2020, 44(5): 1019-1024.
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