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松辽盆地南部梨树断陷天然气轻烃地球化学研究

Keywords: 梨树断陷,松辽盆地,地球化学特征,轻烃,天然气

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Abstract:

?对松辽盆地南部梨树断陷八屋、孤家子、后五家户、皮家等油气田天然气样品的c6—c7轻烃化合物首次开展了系统的地球化学对比研究,结合天然气碳同位素组成特征,认为研究区天然气样品普遍贫芳香烃,绝大多数样品c6—c7饱和烃具链烷烃优势,尤以正构烷烃含量最高,环烷烃含量相对较低,表明该区天然气的母质类型主要为腐泥型;研究区mango轻烃稳态动力学常数k1基本保持恒定,来自湖相烃源岩的c7轻烃中三环优势(3pr)大于五环优势(5pr)和六环优势(6pr),与mango的结论一致。庚烷值、异庚烷值多较高,寓示该区天然气主要为高熟—过熟的裂解气,与该区天然气甲烷碳同位素组成普遍偏重相吻合。

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