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Composition and carbon isotopic distribution characteristics of light hydrocarbon in coal-derived gas and natural gas exploration
|Authors:||Hu Guoyi; Li Jin; Li Zhisheng; Wang Shuying|
|Author Affiliations:||Primary: |
PetroChina Exploration and Development Research Institute, Beijing, China
PetroChina Key Laboratory of Petroleum Geochemistry, China
PetroChina Exploration and Development Research Institute, Langfang Branch, China
|Volume Title:||Shiyou Xuebao Acta Petrolei Sinica|
|Source:||Shiyou Xuebao = Acta Petrolei Sinica, 31(1), p.42-48. Publisher: Shiyou Gongye Chubanshe, Beijing, China. ISSN: 0253-2697|
|Note:||In Chinese with English summary|
|Summary:||The thermal simulation test of light hydrocarbon and the individual light hydrocarbon carbon isotope analysis method were used to investigate the generation model and carbon isotopic composition of light hydrocarbon obtained from coal. The results showed that a large amount of light hydrocarbon was generated from coal when the maturity Ro ranged from 1.1% to 1.7%, and the aromatic amount was the most while the maturity Ro was over 1.7%. The carbon isotope values of benzene and toluene in coal pyrolysed gas are comparatively greater. The δ13C value of benzene was from -25.2per mill to -17.6per mill, and the average value was -22.2per mill. The δ13C value of toluene varied from -25.3per mill to -17.2per mill, and the average value was -22.1per mill. All of these values are quite similar to the carbon isotopes of kerogens in the source rocks, which shows a good inherit effect of carbon isotopic between kerogen and aromatics. The light hydrocarbon composition characteristics of coal-derived gas and carbon isotope analysis showed that the relative content of methylcyclohexane was more than 50% in the C7 light hydrocarbons of methylcyclohexane, dimethylcyclopentane and normal heptane in about 92% of 173 gas samples. The carbon isotope values of benzene, toluene, cyclohexane and methylcyclohexane in natural gas were greater. The δ13C value of benzene ranged from -24.4per mill to -16.2per mill, and the average value was-20.9per mill. The δ13C value of toluene varied from -24.1per mill to -16.9per mill, and the average value was -20.4per mill. The δ13C value of cyclohexane ranged from -25.8per mill to -16.2per mill, and the average value was -21.9per mill. The δ13C value of methylcyclohexane varied from -25.9per mill to -18.7per mill, and the average value was -22.0per mill. The natural gas migration direction analyzed by means of light hydrocarbon composition change showed that the hydrocarbons migrated mainly from the south to north in the forming stage of gas reservoir in Sulige Giant Gasfield.|
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