松辽盆地长岭断陷烃源岩特征与油源对比

CHARACTERISTICS AND OIL-SOURCE CORRELATION OF THE SOURCE ROCKS IN CHANGLING FAULT DEPRESSION,SONGLIAO BASIN

长岭断陷层烃源岩和原油样品的地球化学特征分析表明,火石岭—营城组是主要烃源岩,丰度较低、成熟度较高,以Ⅲ型干酪根为主。饱和烃参数、芳烃三芴系列组成特点均表明烃源岩主要形成于微咸-半咸水湖泊的弱氧化-还原环境中,物源以陆源高等植物输入为主,其次为低等水生生物。烃源岩及原油族组分、碳同位素特征、三环萜烷和四环萜烷系列、藿烷系列、芳烃系列分布特征与对比均表明,油源与营城组烃源岩具有较好的亲缘关系。

The geochemical characteristics analysis of the source rocks and crude oil sample in the Changling fault depression show that the Huoshiling Formation and Yingcheng Formation are the main source rocks,and they have a lower abundance of organic matters and the higher maturity.It belongs to III-type kerogen.The form characteristics of saturated hydrocarbon parameter,aromatic compounds and dibenzothiophene all indicate that the source rocks are formed in the weak oxidation-oxygen-free environment,which are lake facies with lightly saline-brackish water.The terrestrial higher plants are the primary provenance,and the lower aquatic organisms are the next.The distribution characteristics and correlation of the group composition,carbon isotope feature,tricyclic terpane,tetracycle terpane,hopanes and aromatic group all show that oil sources have a close genetic relationship with the hydrocarbon source rock of Yingcheng Formation.