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对马北油田各个构造原油样品的生物标志物进行了系统的分析,研究了它们的地球化学特征。生物标志物的分布和组成特征指示马北油田原油形成于弱还原淡水湖相成油环境;具有陆源高等植物和低等水生生物双输入的特征,为成熟原油,来源于侏罗系淡水湖相生油岩。马北2井原油出现高丰度25-降藿烷系列与完整链烷烃系列并存的现象,说明该原油遭受过生物降解作用改造,该构造至少经历了2期油气充注。
The biomarkers of various crude oil samples from Mabei Oilfield were systematically analyzed and their geochemical characteristics were studied. The distribution and compositional characteristics of biomarkers indicate that the crude oil in Mabei Oilfield formed in the oil phase environment of weakly reduced freshwater lakes. It has the characteristics of dual input of higher terrestrial plants and lower aquatic organisms, and is a mature crude oil derived from the freshwater lake of Jurassic Oil rock. The phenomenon of the coexistence of high-abundance 25-norhopane series with the complete paraffin series in the crude oil of Mabei-2 well indicates that the crude oil has undergone biodegradation and has experienced at least two stages of oil and gas filling.