The Composition and Distribution of Some Kinds of Anaerobic Microorganisms in the Quaternary Deposits of East in Qaidam Basin
An Isotopic Geochemistry Approach on the Identification of Gas Sources of Two Wells in Tarim Basin
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摘要: Under the strictly anaerobic conditions, the quantities of,sulfatereducing bacteria, fermentative bacteris, cellulolytic bacteria and methanogenic bacteria of serial geological quaiernary samples got from an erect section of east in Qaidam basin. The morphology of different kinds of bacteria were observed and the metabolic type of methanogenic bacteria were observed. The result show that the process of reducing sulfate ended and the methanogenic process began.The distributions of fermentative bacteria and cellulolytic bacteria are tandom, they have no relationship with the content of organic matter and cellulose. The morphology of bacteria in different samples are different. The methanogenic bacteria only present in part of samples. All of the methanogenic bacteria belong to the population of Methanobacterium and the type of nutriment is H2/CO2.
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关键词:
- biogenic gas /
- anacrobic bacteria /
- deposits /
- qaidam basin
Abstract: Plenty of geochemical analyses were carried out on natural gas, oil and condensate samples collected from two wells in Tarim Basin and results were employed in interpreting their sources and distinguishing one from the other. The chemical compositions of gases from the both wells showed that they are of oilfied associated gas with a low dry coeffieient. Their carbon isotopic compositions might indicate a mixture of gas sources, and the input of the mantle-derived materials was denied by the isotopic parameters of noble gases, such as 3 He4He and4 He/20Ne ratios. The age of gases from these two wells was identified to be the Palaeozoic by the 40Ar/36Ar ratio. -
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