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| Geochemical exploration of natural gas hydrate in Halahu Depression of Qilian Mountain |
| SUN Zhong-Jun1, 2, 3, WANG Hui-Yan1, 2, 3, ZHANG Shun-Yao1, 2, 3, ZHOU Ya-Long1, 2, 3, ZHANG Fu-Gui1, 2, 3, YANG Zhi-Bin1, 2, 3 |
1.State Research Center of Modern Geological Exploration Engineering Technology,Langfang 065000,China;
2.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China;
3.Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China; |
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Abstract South Qilian basin has become the key area of natural gas hydrate survey in the mid-latitude permafrost since natural gas hydrate was discovered in Halahu Depression. The 1:100 000 geochemical survey was carried out to provide evidence for prospective prognosis of natural gas hydrate in Halahu Depression in 2014. Natural gas hydrate and oil-gas geochemical indexes were analyzed in 3000 km2 survey area, with the sampling density being 1 sampling site per 2 km2. Geochemical anomalies (>30km2) similar to Sanlutian hydrate despoit were delineated, where the abnormal combination of acidolysis methane, acidolysis aridity coefficient, butane isomerization rate, headspace methane and fluorescence 320 exhibited compositional zoning. Further studies show that condensate and coal-type gas were the main source of hydrocarbon gas, and the development of abnormal area was beneficial to the formation of the depth of natural gas hydrate. The results of the survey show that the geochemical technique is suitable for the exploration of natural gas hydrate in the mid-latitude permafrost, and could delineate the prospective area of natural gas hydrate.
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Received: 08 September 2017
Published: 20 December 2017
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