收稿日期: 2003-02-12
修回日期: 2003-03-20
网络出版日期: 2003-04-20
MATHEMATIC MODELS OF STABLE CARBON IS OTOPE COMPOSITION OFCOAL-DERIVED METHANE AND THEIR APPLICATIONS
Received date: 2003-02-12
Revised date: 2003-03-20
Online published: 2003-04-20
邹艳荣;帅燕华;孔枫;彭平安; . 煤成甲烷碳同位素演化的数学模型与应用[J]. 天然气地球科学, 2003 , 14(2) : 92 -96 . DOI: 10.11764/j.issn.1672-1926.2003.02.92
In this paper different mathematic models are discussed, including the relations hip models connected the stable carbon isotope composition with source rock matu ration, distillation models based on Rayleigh expression and kinetic models, and a relationship diagram between instantaneous and accumulation carbon isotope co mposition linked to source bed maturity is proposed on the basis of other resear chers, which can be used to roughly estimate the accumulation/loss history of co al-derived gas pool. Applicable extents of different models are illustrated. The gas accumulation/loss history of Kela 2 gas pool in the Kuqua depression of Tar im Basin, the biggest gas field of China, is restructured as an example by using isotope kinetic model and others. The results suggest that the natural gas of K ela 2 pool, with the carbon isotopic value of -27.78‰~-27.73‰, cumulated fro m early stage of gas generation to about 2.0 Ma, which was hardly lost during th e source rock maturation and gas generation because of coalbeds with strong abso rbability. However, the late generated gas was not filled into this pool due to the overpressure development starting at about 2.0 Ma, which is supported by non -hydrocarbon components in this gas pool.
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