The Study Of Generated Hydrocarbon Of Shen Shan Jurassic Lignite In Simulation Experiments

This article was based on project supported by the Chinese National " 973 " Project (2001CB209100), 《Basic Studies on Formation & Distribution of Natural Gas Reservoirs with High Abundance and Large size and on Economic Development of Gas Condensate & Gas Reservoirs with Low Abundance》 . As close to petroleum geologic condition as possible, we made the thermal simulation experiments on the gases which generated from different macerals. Through the experiments we can obtain different maturity parent materials domains and analysis its gas chemistry and stable isotope. For the study of fractional characteristics of carbon and hydrogen isotope the experiments can provide basic information of the carbon, hydrogen isotopic fractionation during generating hydrocarbon, isotopic fractionation during migration, mixture ratio during accumulation.The sample is the ShenShan Jurassic lignite and collected from of the Ordos basin. Primeval bitumen and its marcerals were conducted thermal simulation experiments in water medium. Gas analysis and stable isotope analysis were applied systematically on the gas products of the marcerals. The solid products of the marcerals were extracted by soxhlet extractor. During the experiments, we made some adjustments on the equipment of the thermal simulation experiments, and designed the order of soxhlet extractor experiments over again.According to the experiments and analysis, we obtain new cognition hereinafter. 1. During soxhlet extractor experiments, copper can react with some organic compounds in extracted matter and form organo-metallic compounds. So it will greatly influence the results of sample pretreatment;2. Hydrocarbon-generated potential of vitrinite is not stronger than that of fusinite. When the temperature of experiments is low 375, hydrocarbon-generated potential of vitrinite will be stronger than that of fusinite. And when above 375 , it is contrary.3. In a same thermal maturity, stable carbon isotope becomes heavy as carbon number increasing. That is the same with carbon isotope distribution of natural gas: 513Ci < 813C2 < 813C3. In the different thermal maturity, carbon isotope distribution of gas hydrocarbon have the character of isotopic fractionation in evidence, which included 813C 813C2. 6I3C3 changing heavy with temperature increasing; In different thermal maturity, hydrogen isotope distribution of gas hydrocarbon have the character of isotopic fractionation in evidence which included SDt 8Dc SDc2 8Dc3 8Dc4 changing heavy with temperature increasing. And in a same thermal maturity there is a rule, 8DH2 < 8DCi < 8DC2 < 8DC3 < 8DC4.