| Technology Application |
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Gas hydrate detection and assessment with remote sensing data of permafrost in the Qilian Mountain |
| LIU Song1, XING Xuewen1, ZHANG Qiang1, YANG Mingguo2 |
1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
2. China University of Geosciences, Wuhan 430074, China |
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Abstract Gas hydrate in permafrost gradually decomposes and seeps to atmosphere because of global warming,and the seepage changes the methane (CH4) concentration of permafrost's atmosphere. In this paper, the possibility of gas hydrate detection with remote sensing data is proved by the nature gas detection experiments performed with domestic nature gas and ASD portable spectrometer. The experimental results show that two feature absorptions,spectra around 1 700 nm and 2 300 nm,are founded in the electromagnetic wave range from 380 to 2500 nm. Supported by the experiment,the authors selected the remote sensing data retrieved from the scanning imaging absorption spectrometer for atmospheric chartography (SCIAMACHY) sensor during the period from 2003 to 2006 to analyze temporal and spatial changes of atmospheric methane of the permafrost in the Qilian Mountain. In addition to the discovery of methane concentration's seasonal changes,the trend of its gradual increment characteristics was also detected. This phenomenon is considered to be the result of methane seepage from underground gas hydrate. Finally,in combination with the geological data, the atmospheric methane anomaly in February 2006 was used to evaluate the potential of gas hydrate of the permafrost in the Qilian Mountain and, as a result, a new prospecting area was recommended.
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| Keywords
hyperspectral image
anomaly target detection
kernel function
support vector data description(SVDD)
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Issue Date: 01 July 2014
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2014,
Vol. 26
