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| AMT acquisition experimental study of gas hydrate exploration in the permafrost region of the Tibetan Plateau |
| PEI Fa-Gen1, 2, 3, HE Mei-Xing1, 2, 3, QIU Gen-Gen1, 2, 3, DU Bing-Rui1, 2, 3, BAI Da-Wei1, 2, 3 |
1.Electromagnetic Detection Technology Key Laboratory of the Ministry of Land and Resources,Langfang 065000,China;
2.National Modern Geological Exploration Technology Research Center,Langfang 065000,China;
3.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China |
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Abstract Obtaining high-quality original data is a key step. Especially in the "dead band" (500 ~ 5000 Hz), the signal of the AMT field source which is the natural electromagnetic field is weak and the apparent resistivity and phase curve are distorted in the dead band. To obtain high-quality data in the permafrost region of the Tibetan Plateau, the authors carried out AMT acquisition experiments of the natural gas hydrate exploration. These experiments included five acquisition parameters, i.e., the acquisition range of time, the acquisition time length, the weather, the electrode length and the density of measuring points. The experiments show that, for the purpose of obtaining high-quality AMT data, the acquisition time range should be selected from the afternoon to the evening, the acquisition time length should be more than 40 minutes, a smaller electrode length (eg. 50~100 m) should be chosen, and the cloudy days are favorable. In addition, the use of high density of measuring points is helpful to building an accurate electrical model.
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Received: 08 September 2017
Published: 20 December 2017
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