摘要
通过对西湖凹陷平湖斜坡带的12个原油样品中轻烃分布及组成特征进行分析,结果表明:原油的轻烃馏分组成中甲苯、甲基环己烷指数高,石蜡指数低;原油发生蒸发分馏作用其程度大体相当于Thompson的5~7次充注观察值;C7化合物组成特征和甲基环己烷指数均指示原油母质来源于腐殖型有机质;Mango轻烃参数K1基本符合轻烃稳定态催化动力学轻烃成因模式;轻烃组分中的庚烷和异庚烷指数因蒸发分馏作用而出现成熟度偏低的假象,原油形成温度在124~131℃之间。
The distribution and characteristics of light hydrocarbon for 12 crude oil samples in the Pinghu Slope of Xihu Sag were studied.The results show that in the light hydrocarbon in crude oil fractions of high abundance of toluene,methyl-cyclohexane in high paraffin index is low.The evaporation fraction of the crude oil is roughly equivalent to the degree of Thompson 5~7times of filling observation value.The characteristics of C7 compounds and methyl-hexane index indicate that crude oil is from parent material of humic type organic matter.Mango light hydrocarbon parameter K1 value is in line with the formation mode of steady-state light hydrocarbon catalytic kinetic light hydrocarbon.Light hydrocarbon components heptane value and isoheptane index present low maturity of illusion of evaporation fractionation effect,crude oil formation temperature is between 124~131℃.
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