论文部分内容阅读
煤层气聚集存在着“累积聚气”和“阶段聚气”两种形式.目前缺乏“阶段聚气”煤层气的地球化学特征和指标的研究.通过草本沼泽泥炭在不同温度下制备的样品进行热模拟实验,获得了不同演化阶段甲烷和乙烷的碳、氢同位素组成和演化规律.发现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.确定了成煤有机质从Ro为1.2%,1.7%,2.4%,3.2%,3.7%分别演化至Ro5.7%(4.8%)之间生成的气体碳、氢同位素组成.建立了成煤有机质在不同演化阶段热解气体碳、氢同位素组成与Ro之间的关系和甲烷与乙烷的碳、氢同位素之间的关系式.这些为研究不同成熟度区间生成的煤层气的成因和“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,这与地质研究结果相一致,从而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.
There are two forms of CBM accumulation such as “Accumulation of gas accumulation” and “Accumulation of gas phase.” There is a lack of research on the geochemical characteristics and indexes of CBM in the “stage gas accumulation.” The results show that the composition of carbon and hydrogen isotopes of methane and ethane are obviously affected by the evolution of the original samples and the hydrogen isotopes The composition is mainly closely related to the maturity, and the carbon, hydrogen isotopes of gaseous organic matter formed from 1.2%, 1.7%, 2.4%, 3.2%, 3.7% Ro to 7.7% (4.8% The relationship between carbon and hydrogen isotope composition of pyrolysis gas and Ro and the relationship between carbon and hydrogen isotopes of methane and ethane have been established for the different evolution stages of coal- The origin of CBM and the understanding of CBM geochemical characteristics and its genetic identification in the “stage polygamy”, and the results of these studies are applied to the study of CBM in the southern Qinshui Basin in our country, and it is considered that the coal seams in the area Gas is After the Middle Jurassic conglomeration, it has the characteristics of “polyphase gas”, which is consistent with the geological research results. It proves that the research results of thermal simulation have important scientific significance on the genesis of CBM in nature.