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| A study of the permafrost thickness and its influence factors based on AMT detection technology on the southeastern margin of Hala Lake, Qinghai Province |
| PEI Fa-Gen1, 2, FANG Hui1, 2, QIU Gen-Gen1, 2, DU Bing-Rui1, 2, HE Mei-Xing1, 2, ZHANG Peng-Hui1, 2, LI Zhen-Yu3 |
1. Institute of Geophysical and Geochemical Exploration,Langfang 065000, China;
2 Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources, Langfang 065000, China;
3. China University of Geosciences (Wuhan), Wuhan 430074, China |
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Abstract Permafrost regions are widely distributed in Hala Lake Basin in the Southern Qilian Mountain,and the basin is considered to be a favorable area for the accumulation of the natural gas hydrates with a great potential.The distribution of permafrost plays an important role in gas hydrate accumulation. The bottom of permafrost on the southeastern margin of Hala Lake was detected by AMT, and the factors affecting the permafrost thickness were analyzed. The detection results are as follows: It is found that using AMT to obtain the permafrost thickness is effective in the study area.Most of the permafrost thickness is between 30 meters and 130 meters, and the distribution of permafrost has the phenomenon that the central and the northwestern parts are thicker whereas other parts are thinner. In particular, the permafrost thickness of the areas including south-central area, central area and northwestern area is more than 80 meters, thus providing good conditions for the cap of the gas hydrate concentration. The main factors for the thickness of permafrost are terrain, slope and surface runoff. In addition, faults and underground water content are also factors influencing the thickness of permafrost .The conditions such as the highlands, the shady side, the non-runoff segment or the non-tectonic fault zone can facilitate greater thickness of permafrost.
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Received: 08 September 2017
Published: 20 December 2017
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