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| The application of audio frequency magnetotelluric sounding to the investigation of gas hydrate in the Hala Lake depression of the Qilian Mountain |
| HE Mei-Xing1, 2, 3, PEI Fa-Gen1, 2, 3, FANG Hui1, 2, 3, ZHANG Peng-Hui1, 2, 3, LIU Chang-Wang1, 2, 3, DU Bing-Rui1, 2, 3, LYU Qin-Yin1, 2, 3, QIU Gen-Gen1, 2, 3 |
1. Electromagnetic Detection Technology Key Laboratory of the Ministry of Land and Resources, Langfang 065000, China;
2. National Research Center of Modern Geological Exploration Engineering Technology, Langfang 065000, China;
3. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China |
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Abstract The Hala Lake depression in Qilian Mountain has similar conditions for the discovery of the gas hydrate in the Qilian area, which is the key area of the hydrate exploration in the permafrost region of the Tibetan Plateau. By analyzing 45 sections in Hala Lake and conducting audio frequency magnetotelluric survey with total length of 606.4 km, the depression structure and distribution of frozen soil were studied for their electrical characteristics. According to the east and west distribution electrical characteristics of Hala Lake area, the authors mainly analyzed structural features of the east part and the west part of Hala Lake. It is shown that the inner depression testing area of Hala Lake can be divided into 3 depression areas and 2 upwelling areas. The authors also analyzed the distribution and scales of depression areas and 2 upwelling areas. 26 fractures were recognized within the depression testing zone of Hala Lake. These fractures mainly strike in NW—SE direction. The main controlling fractures in the testing area were also discussed. The authors summarized the development characteristics of frozen soil in Hala Lake area and analyzed the main factors influencing the development of the frozen soil. According to the abnormal structure, frozen soil and geochemistry of hydrocarbons, the authors indicate the favorable areas for natural gas hydrate exploration.
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Received: 08 September 2017
Published: 20 December 2017
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