摘要
来自楚雄盆地三叠系地层的三个沥青样品长直链烷基苯在C16～C20范围内具强烈的偶碳优势。正构烷烃和烷基环己烷与烷基苯分布的差异表明:偶碳数烷基苯不可能来自直链脂肪酸,也不可能来自一些细菌和某些藻类生物体中的环己基脂肪酸,它可能是成岩作用阶段,在矿物催化作用下偶数碳醇与生物体中简单的芳烃化合物进行烷基化反应抑或是在深成作用早期,长链偶碳数伯醇通过自由基反应与存在于干酪根中苯进行烷基化作用而形成。烷基苯这一分布特征与热演化没有相关关系。
The longstraight alkylbenzenes in three bitumen samples from the Triassic of the Chuxiong Basin show a strong even to odd preference The distribution differences between nalkane, alkylcyclohexane and alkylbenzene revealed that alkylbenzene with even carbon number is derived neither from straightchain fatty acid nor from cyclohexyl fatty acid It may have resulted from the reaction of primary alcohol of even carbon number with the simple aromatic compounds, which were found in many organisms during the diagenetic stage with the help of catalyst, or from the reaction of free radicals between the longstraight primary alcohol of even carbon number and the benzene coated on kerogen during the early stage of catagenesis There is no relationship of the specific distribution of alkylbenzenes with thermal evolution
出处
《地质地球化学》
CSCD
2003年第3期1-5,共5页
Geology-Geochemistry
关键词
楚雄盆地
沥青
长直链烷基苯
偶碳数优势
成因机制
分布特征
Chuxiong Basin
bitumen
long-straight alkylbenzene
even carbon number preference
genetic mechanism
