Comparison of Geochemistry Character between Mudstones from Deep Lacustrine Facies and Coal Measures by Hydrous Pyrolysis
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摘要: 通过深湖泥岩和煤系泥岩的加水热模拟研究认为,在热模拟实验过程中,深湖泥岩和煤系泥岩显示不同特征,并且其演化有差别。深湖泥岩利于液态原油的生成,并且转化率高于煤系泥岩。深湖泥岩残余可溶有机质饱和烃含量高于煤系泥岩,非烃含量则低于煤系泥岩。深湖泥岩胶质 /沥青质和饱芳比均随温度升高而降低,而煤系泥岩的胶质 /沥青质随温度升高有增加趋势,其饱芳比的变化则不大或有降低趋势。深湖泥岩的Tmax难以指示演化阶段,其干酪根碳同位素值明显轻于煤系泥岩,它们的值均随温度的升高而变重。Abstract: The geochemistry characters are discussed which between mudstones from deep lacustrine facies and coal measured by hydrous pyrolysis.Lots of differences of the two samples are pointed out by analysis.The mudstones from deep lacustrine facies and coal measure show difficult evolution features by hydrous pyrolysis. The mudstone from deep lacustrine facies has high hydrocarbon yield and is more profitable to liquid oil generation,so it will mainly generate liquid oil in the course of thermal evolution.The saturated hydrocarbon content is more and the nonhydrocarbon content is lower in the residual dissoluble organic matter in the mudstone from deep lacustrine facies than that in coal measures.The ratio of resin to asphalten and the ratio of saturated hydrocarbon to aromatics increase when the temperature rises in the mudstone from deep lacustrine facies.The ratio of resin to asphalten increases and the ratio of saturated hydrocarbon to aromatics varies little or decreases a little when the temperature rises in the mudstone from coal messures. T max of the pyrolyzed(Rock-Eval) mudstones from deep lacustrine facies can not indicate evolution stage,but T max of the pyrolyzed(Rock-Eval) mudstones from the mudstone from coal measures increases as the temperature rises.The carbon isotope of kerogen from the mudstone from deep lacustrine facies is lower distinctly than that of kerogen from mudstone of coal measures. The carbon isotope of kerogen from two samples becomes heavy as the temperature rises.It is obvious that the T max of the mudstone from deep lacustrine facies should be considered carefully when it is used to rekon the maturity of organic matter,and that the variation of isotope carbon of kerogen should also be thought much when it is used to research the type of organic matter.
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Key words:
- hydroupyrolysis /
- mudstone /
- dissoluble organic matter /
- maturity
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