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煤层气的成因是石油地质学研究的热点.煤层气聚集存在着“累积聚气”和“阶段聚气”两种形式,对于“阶段聚气”的煤层气成因判识的地球化学研究还很薄弱.通过森林沼泽泥炭在不同温度下制备的样品进行热模拟实验,首次获得了不同演化阶段甲烷、乙烷和二氧化碳的碳、氢同位素组成和演化规律.发现随着原始样品演化程度越高,生成的甲烷和乙烷的碳、氢同位素组成具有变重的趋势;同时,甲烷和乙烷碳同位素组成明显地受原始样品演化程度的影响,而氢同位素组成主要与成熟度密切相关.确定了成煤有机质在不同演化阶段生成的气体碳、氢同位素组成.首次获得了成煤有机质不同演化阶段热解气体碳、氢同位素组成与Ro之间的关系式.建立了甲烷与乙烷的碳、氢同位素之间的关系式,形成了甲烷碳、氢同位素组成相关图.根据这些为研究不同成熟度区间生成的煤层气成因提供了科学数据,为“阶段聚气”的煤层气地球化学特征认识及其成因判识提供了科学依据.并且,将这些研究结果应用到我国沁水盆地南部煤层气研究,认为该地区煤层气是在中侏罗世以后聚集而成,具有“阶段聚气”的特征,证明了热模拟研究成果对自然界煤层气成因的判识具有重要的科学意义.
The cause of CBM is the hotspot in petroleum geology research. There are two forms of CBM accumulation, such as “accumulation gas accumulation” and “gas accumulation” Of the geochemical research is still very weak.Firstly, the carbon and hydrogen isotope composition and evolution of methane, ethane and carbon dioxide in different evolution stages were obtained through the thermal simulation experiments of samples prepared from forest marsh peat at different temperatures. The higher the sample evolution, the carbon and hydrogen isotope compositions of methane and ethane produced tend to be heavier. At the same time, the carbon isotope composition of methane and ethane is significantly affected by the evolution of the original sample, while the hydrogen isotope composition is mainly and mature The relationship between the carbon and hydrogen isotope composition of pyrolysis gas and Ro in different evolution stages of coal-forming organic matter was obtained for the first time.Methane And ethane carbon, hydrogen isotopes between the formation of methane carbon, hydrogen isotope composition diagram.According to these for the study of different maturity intervals generated The genesis of CBM provides scientific data and provides a scientific basis for the understanding of CBM geochemical characteristics and its genetic identification in the stage of “polygon accumulation.” Moreover, the results of these studies are applied to the study of CBM in southern Qinshui Basin, It is believed that the coalbed methane in the area gathered after Middle Jurassic and had the characteristic of “stage gas accumulation”, which proves that the research results of thermal simulation have important scientific significance for the genesis of CBM in nature.