岩性油气藏 ›› 2023, Vol. 35 ›› Issue (5): 2636.doi: 10.12108/yxyqc.20230503
潘树新1, 许多年1, 唐勇2, 曲永强1, 王国栋1, 董雪梅2, 胡婷婷2, 马永平1
PAN Shuxin1, XU Duonian1, TANG Yong2, QU Yongqiang1, WANG Guodong1, DONG Xuemei2, HU Tingting2, MA Yongping1
摘要: 准噶尔盆地沙湾凹陷与玛湖凹陷具有相似的构造、沉积及成藏背景。基于对沙湾凹陷岩相古地理格局及源-汇系统的研究,提出了在凹陷中央发育有一个来自西北方向的远源大型沉积体系,即柳树沟河水系,并围绕该水系对沙湾凹陷的沉积演化特征及成藏条件进行了分析。研究结果表明: ①沙湾凹陷柳树沟河水系起源于扎伊尔山,流经中拐凸起后,在沙湾凹陷中央形成了大型河流—三角洲沉积体系,其中的曲流河点砂坝、三角洲前缘水下分流河道、河口坝和席状砂等储集体是油气规模勘探的有利目标。②柳树沟河水系自二叠纪到侏罗纪继承性发育,先后经历了二叠纪水进、三叠纪早期水退与中—晚期水进及侏罗纪湖盆水体震荡发育的过程,形成了中、下二叠统规模烃源岩,二叠系—上三叠统大型三角洲扇体、侏罗系多期河道叠置的储集体以及晚二叠世晚期—早三叠世晚期区域性盖层,构成了纵向上多套生-储-盖优势组合;多期构造运动形成的不整合面和断裂体系构建了沙湾凹陷油气运移、调整的有利输导体系。③柳树沟河水系的发现改变了沙湾凹陷没有大型远源水系、仅发育近源扇三角洲的传统认识;凹陷中央及斜坡低部位是寻找石油天然气规模储层的新领域。
中图分类号:
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