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Geoscience ›› 2019, Vol. 33 ›› Issue (06): 1314-1324.DOI: 10.19657/j.geoscience.1000-8527.2019.06.17

• Applied Geochemistry • Previous Articles     Next Articles

The Analysis of Stability and Abnormal Reproducibility of Geochemical Exploration of Natural Gas Hydrate in Qilian Mountain

ZHOU Yalong1,2(), YANG Zhibin1, ZHANG Fugui1,2, ZHANG Shunyao1,2, SUN Zhongjun1,2, WANG Huiyan1,2   

  1. 1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang, Hebei 065000, China
    2. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth’s Critical Zone,CAGS, Langfang, Hebei 065000, China
  • Received:2019-02-24 Revised:2019-05-07 Online:2019-12-26 Published:2019-12-27

Abstract:

Based on the repeated experimental results of geochemical exploration over the known natural gas hydrate of Muli area in Qilian Mountain, the stability and anomaly reoccurrence of soil acid hydrocarbon, top-air, fluorescence spectrum, carbonate and other indexes were studied and discussed. The results prove that although there are some differences in the characteristic values, such as the maximum value of the contents of different geochemical exploration indexes, the data fluctuation characteristics and data structure are relatively consistent. The results of the previous two measurements of top air methane, acid hydrocarbon, fluorescence spectrum and carbonates are related, and the paired T-test shows no obvious difference in data variation of above indexes, while the index data have good stability statistically. Geochemical anomalies of top-air methane, acid hydrocarbon, fluorescence spectrum and other indicators have similar spatial distribution characteristics over known natural gas hydrate mining areas in the study area, which indicates that the geochemical anomalies has good stability and reproducibility, while the abnormal pattern of heavy hydrocarbon of top-air and the variation of abnormal intensity of carbonates reflects that the anomalies has better reoccurrence with worse stability.

Key words: natural gas hydrate, geochemical exploration index, abnormal stability, abnormal reproducibility, Muli area of Qilian Mountain

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