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通过对舞阳、襄城凹陷原油及烃源岩样品的有机地化分析 ,研究了该区未熟油地球化学特征、判别标志及成因类型。认为盐湖盆地原油具“两高、两低”特征 ,族组成上表现为饱和烃含量较低 ,“非烃 +沥青质”含量较高。正烷烃呈双峰态分布 ,OEP值 >1。具植烷优势 ,Pr/Ph <0 .2 5。萜烷以伽玛蜡烷含量高 ,Tm/Ts >1。脱羟基维生素E普遍存在 ,其分布型式主要有倒“V”字型和不对称“V”字型。根据C2 9甾烷 2 0S/ (2 0S +2 0R) ,C2 9甾烷 ββ/ (ββ +αα) ,C3 2 藿烷 2 2S/ (2 2S +2 2R)等成熟度参数 ,认为原油属于未熟油。伽玛蜡烷、脱羟基维生素E及碳同位素组成特征反映原油属咸水湖相、盐湖相成因。
Based on the organic geochemical analysis of the crude oil and source rock samples in Wuyang and Xiangcheng Depression, the geochemical characteristics, distinguishing marks and genetic types of the immature oil in this area were studied. It is considered that the crude oil in the Salt Lake Basin is characterized by “two highs and two lows”, and its composition is characterized by a lower content of saturated hydrocarbons and a higher content of “non-hydrocarbon + asphaltene”. N-alkanes showed a bimodal distribution, OEP value> 1. With phytane advantage, Pr / Ph <0. The terpane has a high gamma-alkane content, Tm / Ts> 1. Dehydroxyvitamin E is ubiquitous and its distribution patterns include inverted “V” and asymmetric “V”. According to the maturity parameters such as C2 9 sterane 2 0S / (2 0S +2 0R), C2 9 sterane ββ / (ββ + αα) and C3 2 hopane 2 2S / (2 2S +2 2R), the crude oil belongs to Unripe oil. Gamma-wax, dehydroxyvitamin E and carbon isotopic composition characteristics reflect the origin of salt is lacustrine facies, salt lake facies.