硫对甲烷碳同位素分馏的影响

通过热模拟实验,系统研究了单质硫在有机质生成甲烷过程中对其碳同位素分馏的影响。结果表明,在低—中温条件下,对于产自假干酪根和全岩的甲烷来说,单质硫的存在,总体上使其碳同位素值变轻,但在不同温度段对不同母质的影响程度不同。单质硫的存在会导致普遍出现假干酪根甲烷碳同位素值轻于全岩甲烷碳同位素值;单质硫的存在可使全岩系列甲烷碳同位素值随有机质成熟度的增加反而变轻。研究还显示,单质硫主要是作为反应物参予反应从而影响甲烷碳同位素分馏。 

EFFECTS OF ELEMENT SULFUR ON CARBON ISOTOPIC FRACTIONATION OF METHANE

The effects of element sulfur on carbon isotopic fractionation of methane have been systematically studied by the simulation experiments of thermal transformated methane from organic matter.The results show that during the low to middle temperature,the values of methane carbon isotope from similitude kerogen and total rock are lighter in the presence of element sulfur than in the absence of element sulfur.The changing extent of carbon isotope is different at different tempertures and the organic type by effects of element sulfur.Carbon isotopic value of methane from similitude kerogen is lighter than that from total rock in the presence of element sulfur.Carbon isotopic values of methane from total rock series are lightening with the increasing maturity of organic matter in the presence of element sulfur.Mechanics analysis revealed that element sulfur is mostly effect carbon isotopic values of methane as a reactant.