济阳坳陷严重生物降解油的类型与形成途径

Type and formation way of severe biodegradation oil in Jiyang Depression

生物降解油的类型复杂多样,将济阳坳陷出现的严重生物降解油划分为2种类型:原油遭受生物降解后产生丰富的25-降藿烷系列和原油生物降解后不含有25-降藿烷系列。描述了这2种生物降解油的生物标志物组合及降解的不同顺序,划分了它们的降解级别,并从分子结构上分析了升藿烷系列降解的机理。在原油遭受严重降解时,伽马蜡烷也会降解生成25-降伽马蜡烷等新的化合物。

The type of biodegradation oil is complicated and diversified. The severe biodegradation oil in Jiyang Depression is divided into two types: one is rich in 25-norhopanes series generated after biodegradation of crude oil; the other lacks 25-norhopanes series after the biodegradation. The author described two biomarker combinations and the biodegradation sequences of the biodegradation oil,classified the degradation level,and analyzed the degradation mechanism of homohopane series compound according to the molecular structure. When crude oil is severely degradared, gammaeerane will be degradated to form 25-norgammacerane and some other new compounds.