营尔凹陷原油族群划分及勘探意义

Classification of Crude Group in Ying'er Sag and Its Exploratory Significance

酒泉盆地营尔凹陷原油地球化学性质较相似,但可细分为若干族群,选择原油族组分、轻烃及生物标志化合物参数,结合原油的地质产层将原油分为3个族群。油源对比表明,3组原油分别与中沟组、下沟组下段、赤金堡组烃源岩存在亲源关系。通过原油族群划分,中沟组、下沟组下段、赤金堡组为营尔凹陷3套各自独立成藏系统,勘探中要分别予以重视。

The crude oil from Ying＇er sag in Jiuquan basin features simital nature in geochemistry,but it can be divided into three groups based on given oil group,light hydrocarbors and biomarker data in tergrated with geologic productive rcsevoir of the crude oil.The oil source correlation shows that these groups are related to the souree rocks in Zhonggou foration,Lower Xiagou formation and Chijinbu formation.The three sets of self-existent hydrocarhon accumulation systems in Ying＇er sag should be paid more attention to during futher exploration in this area.