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珠江口盆地北部坳陷带文昌组地震反射特征及沉积环境分析

Keywords: 文昌组,地震反射,沉积环境,珠江口盆地北部

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Abstract:

?珠江口盆地北部坳陷带文昌组分布广泛,是该区主要烃源岩发育层段。对文昌组的划分以及分布规律的认识,是洼陷评价的基础。通过井—震标定,从单井资料入手,结合地震反射特征分析,认为文昌组顶、底界面在洼陷边缘为不整合面,洼陷中央为整合面,具有4种类型;根据井—震标定将文昌组分为2~3段,洼陷陡坡带发育扇三角洲相(楔状、杂乱、弱反射)和冲积扇(楔状、杂乱、强反射),深陷带发育滨浅湖相(中—低频、中等连续性、弱反射)和中深湖相(低频、连续、强反射),缓坡带发育三角洲相(前积结构、中—高频、中等连续、中—弱反射);文昌组沉积物纵向表现为粗—细—粗的特征,洼陷底部为冲积扇—扇三角洲相,中部过渡为滨浅湖—中深湖相,顶部为扇三角洲—滨浅湖相。受物源、水体以及后期剥蚀作用,不同洼陷沉积环境不同。

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