| 渤海湾盆地南堡凹陷西斜坡中深层“混合型河口坝”成因及沉积学意义 |
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| 引用本文： | 夏景生,王志坤,王海荣,薛林,王恺,刘成权.渤海湾盆地南堡凹陷西斜坡中深层“混合型河口坝”成因及沉积学意义[J].吉林大学学报(地球科学版),2017(6):1642-1653. |
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| 作者姓名： | 夏景生 王志坤 王海荣 薛林 王恺 刘成权 |
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| 作者单位： | 1. 中国石油冀东油田公司勘探开发研究院,河北唐山,063004;2. 中国地质大学(北京)能源学院,北京,100083;3. 中国石油集团东方地球物理勘探有限责任公司,河北涿州,072750;4. 吉林油田公司地球物理勘探研究院,吉林松原,138000 |
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| 基金项目： | 国家科技重大专项，中国石油天然气股份有限公司科技重大专项，Supported by National Science and Technology Major Project，Science and Technology Major Project of PetroChina Company Limited |
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| 摘 要： | 在渤海湾盆地南堡凹陷西斜坡中深层扇三角洲上发现一类特殊的"混合型河口坝"沉积体。通过对研究区中深层岩心的观察与分析,结合测井相、地震相对该种"混合型河口坝"的沉积特征、坝体形态、空间展布规律进行研究,并对其成因机制进行分析。结果表明:该类"混合型河口坝"岩性组合在垂向上表现为由多个小级别反、正复合旋回组成的整体向上变粗的反旋回沉积序列,其沉积物重力流成因特征较明显;在平面上该类坝体主要发育于扇三角洲水下分流河道的前端,呈舌状或朵叶状;在沿物源方向的剖面上主要呈"条带状""琵琶状""反琵琶状"及"纺锤状"4种形态;在横切物源的方向上主要呈相互独立的透镜状。该类特殊的"混合型河口坝"与常规意义上的河口坝有重要差别,根据其特征,把这种特殊型"混合型河口坝"称之为重力流混合坝。
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| 关 键 词： | 扇三角洲 砂质碎屑流 异重流 重力流混合坝 南堡凹陷西斜坡 |
Blended Mouth Bars' Cause and Sedimentary Significance of Middle-Deep Beds in Western Slope of Nanpu Sag,Bohai Bay Basin |
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| Abstract: | A unique type of blended mouth bars was recognized in middle-deep fan deltas in the western slope of Nanpu Sag,Bohai Bay basin.Combined with logging and seismic facies,and blended mouth bars' sedimentary features,the authors investigated bars' form,distribution patterns,and the genetic mechanisms by systematic view and analysis of cores from middle-deep beds of the research area.The results indicate that the lithology combination of the blended mouth bar shows an overall vertical upward sedimentary sequence consisting of multiple small reverse and positive compound cycles,the features of deposition from gravity flow.In a plane view,these blended mouth bars develop usually in front of underwater distributary channels of fan delta,and they present usually the forms of ligule or leaf.On the section,these blended mouth bars mainly show banded form,lute-shaped form,reversed lute-shaped form,and spindle-shaped form along depositional dip.These bars are independent lentoid sand body on perpendicular to source direction.These special blended mouth bars are quite different from the normal mouth bars on the basis of their characteristics,so they are called blended gravity flow bars. |
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| Keywords: | fan delta sandy debris flow hyperpycnal flows blended gravity flow bar western slope of Nanpu Sag |
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