Gas Sources Genesis in the Gas Hydrate Discoveries and Potential Areas

Abstract

Abstract:

In order to study the gas sources genesis in gas hydrate discoveries and potential areas, gas-generating amounts of 58 sediment samples from 4 sites of ODP 204 Expedition have been modeled by 5 temperature points, gas chromatography is used to test the isotope from different temperature points. The test results show that methane carbon isotope(δ¹³C)is evidently heavier among the lower temperature modeling points, commonly larger than -40‰, displaying the isotopic feature of thermogenic gas; while the lighter δ¹³Ccould reach to -75.5‰ when the modeling temperature is higher than 55℃,showing the isotopic feature of biogenic gas. Integrated with the discussion of gas genesis of Dongsha potential area, the conclusions could be drawn as follows, gas genesis could be controlled by many factors, and correct gas genesis could be got through the combination of other factors besides the methane carbon isotope. 

Key words: gas-genesis, δ¹³C, hydrocarbon gas, modeling, Dongsha area, ODP 204 Expedition

CLC Number:

GONG Jian-ming, ZHANG Min, CHEN Jian-wen, LI Jin, CHEN Li-ying，CHENG Hai-yan. Gas Sources Genesis in the Gas Hydrate Discoveries and Potential Areas[J]. Geoscience, 2008, 22(3): 415-419.

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