岩性油气藏 ›› 2024, Vol. 36 ›› Issue (6): 122134.doi: 10.12108/yxyqc.20240612
屈卫华1, 田野2, 董常春3, 郭小波4, 李立立3, 林斯雅4, 薛松3, 杨世和5
QU Weihua1, TIAN Ye2, DONG Changchun3, GUO Xiaobo4, LI Lili3, LIN Siya4, XUE Song3, YANG Shihe5
摘要: 基于烃源岩、天然气、储层流体包裹体等实验分析,系统研究了松辽盆地德惠断陷白垩系烃源岩地球化学特征、发育环境、天然气成因与来源、油气成藏期次以及烃源岩的控藏作用等。研究结果表明:①德惠断陷白垩系烃源岩TOC普遍大于1%,有机质类型以Ⅲ型为主,Ⅱ型样品主要分布在农安南洼陷,总体处于成熟—高成熟的大量生气阶段;火石岭组与营城组烃源岩形成于还原—弱还原、水体盐度较高的沉积环境,农安南洼陷火石岭组烃源岩中浮游生物、藻类等低等生源贡献较大,生油能力更强。②白垩系天然气组成差异大,烷烃气体积分数为2.0%~98.5%,CO2体积分数为0.1%~96.5%;天然气主要为煤成气,受不同期次天然气充注影响,部分气样呈碳同位素倒转特征;郭家、华家与农安南洼陷的油气源岩以火石岭组为主;鲍家洼陷的天然气可能主要来自营城组;CO2主要为无机成因,随埋深增大,碳酸盐胶结物碳同位素组成表现为正偏移,指示深部存在钻遇高无机CO2气层的风险。③农安南洼陷的烃源岩正处于大量生油阶段,由南部至北部,烃源岩热演化程度逐渐增高,控制了“南油北气”的相态分布,也控制了油气成藏期次;工业油气流井主要分布在烃源岩厚度较大地区及附近,烃源岩的分布控制了油气藏的分布。
中图分类号:
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