The Muli gas hydrate reservoir in Qilian Mountains was chosen as the test area for the geochemical exploration of gas hydrate in the middle-latitude region. Soil headspace gas, acid-extracted hydrocarbon, carbon isotope of methane were tested. Results reveal that geochemical anomalies were consistent with the underlying gas hydrate reservoir. The carbon isotope of methane and the hydrocarbon composition of the surface geochemical anomaly indicated a thermogenic origin, which suggests that the gas source of the potential gas hydrate reservoir in this area may be contributed by oil gases. The proposed accumulation model was also studied for the gas hydrate reservoir.

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