异重流成因和异重岩沉积特征

被引：40

作者：

Carlos Zavala ^{[1
,2
]}

潘树新 ^{[3
]}

机构：

[1] GCS Argentina

[2] 阿根廷国立南方大学地质学系

[3] 中国石油勘探开发研究院西北分院

来源：

岩性油气藏 | 2018年 / 30卷 / 01期

关键词：

异重流; 异重岩; 浊流; 深水沉积; 内乌肯盆地; 鄂尔多斯盆地; 松辽盆地; 西伯利亚盆地;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

0709 ; 081803 ;

摘要：

河流在洪水期携带大量陆源碎屑,当其入湖或入海后,由于洪水密度大于周围水体的密度,洪水发生下沉并沿盆地底部长距离运移,形成陆源下潜流或异重流。异重流形成的相关沉积岩被统称为异重岩。异重岩通常由一个底部的反粒序单元和一个顶部的正粒序单元组成,反粒序单元反映了异重流能量的逐渐增强,正粒序反映了流体能量的逐渐减弱。异重流以3种方式搬运碎屑颗粒,即底载搬运、悬浮搬运和漂浮搬运。根据搬运方式的不同,异重岩分为3类岩相,即底载成因的B类岩相、悬载成因的S类岩相和漂浮物成因的L类岩相。异重流的沉积充填形成了河道、堤岸和朵叶体3类微相,内部岩相变化极为发育。异重岩的沉积特征虽然典型且较易识别,但是常被误认为是砂质碎屑流、滨岸相、三角洲相或河流相沉积。

引用

页码：1 / 18

页数：18

共 22 条

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