岩性油气藏 ›› 2021, Vol. 33 ›› Issue (1): 111.doi: 10.12108/yxyqc.20210101
• 论坛与综述 • 下一篇
袁选俊1,2, 周红英1, 张志杰1,2, 王子野1, 成大伟1, 郭浩3, 张友焱1, 董文彤1
YUAN Xuanjun1,2, ZHOU Hongying1, ZHANG Zhijie1,2, WANG Ziye1, CHENG Dawei1, GUO Hao3, ZHANG Youyan1, DONG Wentong1
摘要: 坳陷湖盆大型浅水三角洲是目前中国陆上岩性油气藏规模储量增长的主体。通过对松辽盆地南部上白垩统保乾三角洲和现代鄱阳湖赣江三角洲解剖,重点探讨湖盆浅水三角洲形成的地质背景、沉积特征与生长模式。结果表面:①坳陷湖盆具有形成大型浅水三角洲的沉积背景,敞流型湖盆导致的湖平面频繁升降控制了浅水三角洲的纵横向发育规模。②松辽盆地南部上白垩统发育2种不同类型的三角洲,深湖型三角洲一般呈朵叶状,沉积亚相展布清晰,沉积微相以分流河道、河口坝和分流河道间为主;浅湖型三角洲一般呈鸟足状或树枝状,沉积亚相分异不明显,沉积微相以分流河道和分流河道间为主,河口坝不发育;③通过现代沉积遥感定量分析,刻画了鄱阳湖赣江中支三角洲近50年的发育特征和演化规律,揭示了分流河道从分散树枝状到闭合结网状的生长过程。④坳陷湖盆大型浅水三角洲是不断发育的多期朵叶体在平面上拼接而成的复合体,其中分流河道是最重要的储集砂体类型,在平面上呈结网状分布,控制了大面积岩性油气藏的分布与富集。
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