A QUEST FOR A NEW PARAMETER IN PETROLEUM EXPLORATION GEOCHEMISTRY
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摘要: 本文主要对澳大利亚高含量蜡和正烷烃的陆源原油的成因及生成潜量进行研究.研究中作者发现,采用目前已有的地球化学方法难以解释其成因及生成潜量.为此,作者通过水热解和氢化反应试验,提出把化学结构作为一种控制因素,以源岩中热稳定的长链和正烷基组份作为该原油的预测和评价标准.Abstract: Primary Australian terreestrially-derived crudes are characterised by high wax and n-alkane contents.These characteristics, as determined by hydrogenation and hydrous pyrolysis, appear to be unrelated to either the chemical or petrographic compositions of Victorian brown coal lithotypes. Furthermore, since relationships between chemical and petrographic composition are obscure, a re-examination of current concepts which relate these established source rock parameters to liquid hydrocarbon generating potentials is warranted. The content of thermally stable, longer chain, n-alkyl components in source rocks is introduced as the critical factor in determining whether these rocks have the potential to generate typical Australian waxy crudes or hydrocarbon gases. Modifications to this general concept are required by the thermal stability of directly substituted longer chain n-alkyl aromatics and hydroaromatics. These appear to be sources of light hydrocarbons and gases, rather than oils. Inherent weaknesses in the experimental techniques of hydrogenation and hydrous pyrolysis have hindered the collection of data, but the concept that n-alkane potential is a critical factor in determining the petroleum-generating potential of immature source rocks is being pursued using techniques modified for the determination of their total heteroatom-bonded n-alkyl contents.
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