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在澳大利亚,储集的液态烃类的生油岩实际上与北半球的生油岩不同。澳大利亚的生油岩不仅多半是陆源成因的,而且在这里确定生油岩的烃类潜能的一些公认的概念最近也受到了挑战。虽然澳大利亚生油岩和液态烃类的同位素测定结果与其它地方所发表的结果相似,但是对这些资料作了一些新的解释,特别是关于煤中D/H比的解释。与甲烷、较高含量的气态烃类和二氧化碳的成因、历史有关的重要发现,以及用烃类成因观点对这些资料进行解释的这些成果可能是十分有意义的。北半球根据同位素成分和化学成分表示生物成因气和与油伴生气等特征的原始概念显然不适用于澳大利亚。可利用的有关证据表明,北半球这样精确的分类是存在问题的。本文对库珀、博恩、悉尼和吉普斯兰盆地以及澳大利亚西北大陆架天然气的同位素和化学成分资料作了介绍,并且用烃类生成途径的观点对此作了评价。
In Australia, the source rocks of the stored liquid hydrocarbons are actually different from the source rocks in the northern hemisphere. The source rock in Australia is not only mostly terrigenous but some of the accepted concepts here that define the hydrocarbon potential of source rocks have also recently been challenged. Although the isotopic results of Australian source rock and liquid hydrocarbons are similar to those published elsewhere, some new explanations are given for these data, especially with regard to the D / H ratio in coal. These results, which relate to the causes of methane, higher levels of gaseous hydrocarbons and carbon dioxide, historical discoveries, and interpretation of these data from the point of view of hydrocarbon genesis, can be very relevant. The original notion of features in the Northern Hemisphere based on isotopic composition and chemical composition, such as biogenic gas and oil associated gas, clearly does not apply to Australia. Available relevant evidence shows that such accurate classification in the northern hemisphere is problematic. This paper presents information on isotopic and chemical composition of natural gas in the Cooper, Beaune, Sydney and Gippsland basins, and in the northwestern continental shelf of Australia and evaluates it in the light of hydrocarbon generation pathways.