岩性油气藏 ›› 2022, Vol. 34 ›› Issue (1): 7385.doi: 10.12108/yxyqc.20220108
张小琴1,2, 李威3, 王飞龙4, 王宁1,2, 徐耀辉1,2, 刘岩1,2, 程如蛟1,2, 刘华秋1,2
ZHANG Xiaoqin1,2, LI Wei3, WANG Feilong4, WANG Ning1,2, XU Yaohui1,2, LIU Yan1,2, CHENG Rujiao1,2, LIU Huaqiu1,2
摘要: 辽东湾地区古近系沙河街组沙三段、沙一段及东营组东三段为主要的烃源岩层,具有良好的油气勘探前景。为了揭示烃源岩的地球化学特征、沉积环境及生物来源,利用岩心和岩屑样品,通过热解、总有机碳含量测定及饱和烃色谱-质谱分析等方法,对这3套烃源岩的有机质丰度、类型、成熟度及生物标志物特征进行研究。结果表明:辽东湾地区沙一段烃源岩有机质丰度最高,沉积于较高盐度的还原湖相环境,有机质多来源于低等水生生物;沙三段烃源岩有机质丰度较高且多为混合型来源,沉积于淡水湖相沉积环境;东三段烃源岩有机质丰度最低,多来自于陆源高等植物,沉积于淡水湖相沉积环境。3套烃源岩的沉积环境和生物来源具有明显差异,通过伽马蜡烷指数,姥植比以及规则甾烷相对含量能有效识别和区分这3套烃源岩。
中图分类号:
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