Thermal Simul ation Research of Partial opposites Sequence of Carbon Isotope and Ethane Carbon Isotope of Gases
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摘要: 通过煤系源岩热模拟实验烃类气地球化学研究，结合源岩自然演化形成天然气的研究，认为煤系源岩在热演化进程中，随着演化程度增高，δ13C1值从轻变重；δ13C2变化较小，在低演化阶段一般为-28‰±（Ro=045%～0．65%），当派岩进入生烃门限阶段δ13C2值一般为-26‰-23‰左右。且随热演化程度增高进一步变重，但一般不大于-20‰。烃类气碳同位素系列的部分反序现象，不仅仅是不同成因天然气混源特征，在有机质类型特定的情况下，源岩自身演化亦可形成。Abstract: Through research of gaseous hydrocarbon geochemistry of thermal simulating experiment and productive gaseous matter of nature evolution process from coal- measure source rocks, author think changeable of methane carbon isotope (δ13C1) are been from light t weight along with add of degrees in course thermal evolution of coal-measure source rocks. The changeable range of ethane carbon isotope(δ13C2) are rather narrow from-28.3‰ to-20‰(PDB). δ13C2 value ware-28‰±(Ro=0.45%-0.65%)is the lower thermal evolution stage of coal-measure source rocks, when the rocks ware getting into mainly hydrocarbon-generating stages (Ro=0.6%-1.5%)δ13C2 value of the gases are generally distributed -26‰ - -23‰,along with going step further evolution of the rocks,ethane carbon isotope ware gradualty got weight and δ13C2 vaice or generally large than -20‰. It is not the only characteristics of mixed-source gathered of differentially stem from gases that partial opposites sequence of the carbon isotope,on condition that specified styles of organisic,hydrocarbon source rocks have to from for its oneself vcolution.On the lower evolution stages of the rocks,it is mainly may decided by organic mather-source that gaseous hydrocarban carbon isntope are crccLlrrdr: features of partial opposites seqence and ethane carbon isotope value relatively lower,the features are related to geochemical compositions of primary soluble organic matter.
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Key words:
- coal-type gas /
- thermal simulation /
- carbon isotope
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