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根据祁连山永久冻土区区域地质背景、成矿条件和岩石物性特征,开展了CSAMT方法的探测研究。通过对CSAMT原始数据的分析解释,发现测区浅部0～100m深度段,呈现一似层状的高电阻率异常;在中深部存在纵向条带状低电阻率异常且电阻率呈现横向不连续变化。结合地质、钻孔资料得出浅部0～100m深度段的高电阻率异常为冻土层的反映,中深部呈现横向不连续的电阻率变化或纵向条带状低阻异常为断裂构造引起。因此认为CSAMT能够很好地分辨出天然气水合物形成、运移所需要的冻土盖层和断裂构造。
According to the regional geological background, metallogenic conditions and petrophysical properties of the Qilian Mountain permafrost region, the CSAMT method was explored. Through the analysis and interpretation of the original CSAMT data, it is found that the shallow depth of 0-100 m in the survey area shows a layer-like high-resistivity anomaly. In the middle-deep part, there exist longitudinal strip-shaped low resistivity anomalies and resistivity transverse discontinuities Variety. According to the geological and borehole data, it is concluded that the high resistivity anomalies in the shallow depth from 0 to 100 m reflect the permafrost formation, the discontinuous resistivity changes in the middle and deep depths, or the low resistivity anomaly in the longitudinal direction are caused by the fault structure. So CSAMT can well distinguish the frozen soil cover and fault structure required for gas hydrate formation and migration.