断陷湖盆浅水三角洲沉积体系

P343.5%TE121.3+2; 浅水三角洲不仅可发育在陆相坳陷盆地,也可在断陷湖盆初始期、萎缩期和断-坳转化期发育.浅水三角洲的形成受控于古构造、古地形、古水体、古气候及古物源等因素,在岩性、沉积结构、沉积构造、测井曲线、古生物及地球物理响应等6个方面具有与其他三角洲不同的沉积特征.基于物源体系可将浅水三角洲划分为浅水扇三角洲、浅水辫状河三角洲及浅水曲流河三角洲3种类型.断陷湖盆浅水三角洲的发育具有明显的阶段性和多变性,受构造影响较大.断陷湖盆初始期,由近岸向远岸,A/S值逐渐增加,河道砂体规模变小,连通性变差,席状化程度增强,平面砂体形态由毯状、坨状过渡为朵状、带状.断陷湖盆萎缩期,A/...

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Published in地球科学与环境学报 Vol. 40; no. 2; pp. 186 - 202
Main Authors 叶蕾, 朱筱敏, 秦祎, 朱茂
Format Journal Article
LanguageChinese
Published 中国石油大学(北京)地球科学学院,北京,102249%中国石油杭州地质研究院,浙江杭州,310023 2018
Subjects
断陷湖盆
沉积特征
控制因素
沉积模式
分类方案
浅水三角洲
识别标志
发育条件
Online AccessGet full text
ISSN1672-6561
DOI10.3969/j.issn.1672-6561.2018.02.006

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Abstract P343.5%TE121.3+2; 浅水三角洲不仅可发育在陆相坳陷盆地,也可在断陷湖盆初始期、萎缩期和断-坳转化期发育.浅水三角洲的形成受控于古构造、古地形、古水体、古气候及古物源等因素,在岩性、沉积结构、沉积构造、测井曲线、古生物及地球物理响应等6个方面具有与其他三角洲不同的沉积特征.基于物源体系可将浅水三角洲划分为浅水扇三角洲、浅水辫状河三角洲及浅水曲流河三角洲3种类型.断陷湖盆浅水三角洲的发育具有明显的阶段性和多变性,受构造影响较大.断陷湖盆初始期,由近岸向远岸,A/S值逐渐增加,河道砂体规模变小,连通性变差,席状化程度增强,平面砂体形态由毯状、坨状过渡为朵状、带状.断陷湖盆萎缩期,A/S值较小时,发育丝带状或鸟足状三角洲,水下分流河道推进速度快,单期砂体较厚,横向变化快;A/S值较大时,多发育扇形、舌形或伞状三角洲,水下分流河道不发育,河口坝和席状砂成片出现,砂体横向较稳定,单砂体厚度不大.通过上述研究探讨了断陷湖盆浅水三角洲的发育特征和沉积模式,为完善陆相湖盆浅水三角洲理论提供依据.
AbstractList P343.5%TE121.3+2; 浅水三角洲不仅可发育在陆相坳陷盆地,也可在断陷湖盆初始期、萎缩期和断-坳转化期发育.浅水三角洲的形成受控于古构造、古地形、古水体、古气候及古物源等因素,在岩性、沉积结构、沉积构造、测井曲线、古生物及地球物理响应等6个方面具有与其他三角洲不同的沉积特征.基于物源体系可将浅水三角洲划分为浅水扇三角洲、浅水辫状河三角洲及浅水曲流河三角洲3种类型.断陷湖盆浅水三角洲的发育具有明显的阶段性和多变性,受构造影响较大.断陷湖盆初始期,由近岸向远岸,A/S值逐渐增加,河道砂体规模变小,连通性变差,席状化程度增强,平面砂体形态由毯状、坨状过渡为朵状、带状.断陷湖盆萎缩期,A/S值较小时,发育丝带状或鸟足状三角洲,水下分流河道推进速度快,单期砂体较厚,横向变化快;A/S值较大时,多发育扇形、舌形或伞状三角洲,水下分流河道不发育,河口坝和席状砂成片出现,砂体横向较稳定,单砂体厚度不大.通过上述研究探讨了断陷湖盆浅水三角洲的发育特征和沉积模式,为完善陆相湖盆浅水三角洲理论提供依据.
Author 叶蕾
秦祎
朱茂
朱筱敏
AuthorAffiliation 中国石油大学(北京)地球科学学院,北京,102249%中国石油杭州地质研究院,浙江杭州,310023
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ZHU Xiao-min
ZHU Mao
QIN Yi
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Keywords 断陷湖盆
沉积特征
控制因素
沉积模式
分类方案
浅水三角洲
识别标志
发育条件
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Title 断陷湖盆浅水三角洲沉积体系
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