| 渤海湾盆地埕北低凸起及围区古近系“源-汇”系统控砂原理定量分析* |
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| 引用本文： | 胡贺伟,李慧勇,于海波,肖述光,徐伟.渤海湾盆地埕北低凸起及围区古近系“源-汇”系统控砂原理定量分析*[J].古地理学报,2020,22(2):266-277. |
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| 作者姓名： | 胡贺伟 李慧勇 于海波 肖述光 徐伟 |
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| 作者单位： | 中海石油(中国)有限公司天津分公司,天津 300452 |
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| 基金项目： | *国家科技重大专项子课题“渤海海域大中型油气田地质特征”(编号: 2011ZX05023-006-002)资助 |
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| 摘 要： | 埕北低凸起及围区发育完整的“源-汇”系统。在“源-汇”思想的指导下,利用录井、测井、取心、三维地震等基础资料,在精细刻画埕北低凸起及围区沉积体系类型及特征的基础上,定量探讨了“源-汇”系统各要素之间的耦合关系。研究表明: 古近纪,埕北低凸起基岩类型主要为中生界碎屑岩,源区内共发育9个有效物源区;埕北低凸起共识别出15条古沟谷型和2条断槽型输砂通道,其中古沟谷型输砂通道可细分为U型、V型及W型;埕北低凸起及围区陡坡带发育扇三角洲、半深湖—深湖沉积,扇三角洲平面上呈朵状展布,各扇体之间不连通,而缓坡带除局部构造早期发育扇三角洲外,整体发育辫状河三角洲、滨浅湖、半深湖—深湖等沉积,平面分布范围广,呈连片叠合分布;“源-汇”系统各要素定量分析表明,汇区沉积体面积及形态与有效物源区面积、沟谷的长、宽、宽深比等参数密切相关;从“源-汇”耦合模式分析认为,有效物源区面积控制沉积体系发育规模,输砂通道控制沉积体系的优势展布方向及形态。
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| 关 键 词： | "源-汇"系统 古近系 定量化 沉积体系 埕北低凸起 |
| 收稿时间： | 2018-10-31 |
Quantitative analysis of source-to-sink system controls on sand-body distribution of the Paleogene in Chengbei low uplift and surrounding areas,Bohai Bay Basin |
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| Hu He-Wei,Li Hui-Yong,Yu Hai-Bo,Xiao Shu-Guang,Xu Wei.Quantitative analysis of source-to-sink system controls on sand-body distribution of the Paleogene in Chengbei low uplift and surrounding areas,Bohai Bay Basin[J].Journal of Palaeogeography,2020,22(2):266-277. |
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| Authors: | Hu He-Wei Li Hui-Yong Yu Hai-Bo Xiao Shu-Guang Xu Wei |
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| Institution: | Tianjin Branch of CNOOC China Company Limited,Tianjin 300452,China |
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| Abstract: | In this paper,Chengbei low uplift and the surrounding areas is taken as a whole source-sink system. On the basis of this,utilizing logging,well logging,rock core and 3D seismic data,analysis of sedimentary system types and features of Chengbei low uplift,the quantitative relationship of elements in source-to-sink system is discussed. The results indicate that lithology of basement rock in the Chenbei low uplift is Mesozoic clastic rock during the Paleogene,thin section and the geophysical response data in this study,basement rock is subdivided into nine drainage systems. The corresponding transport pathways including fifteen paleo-valleys and two fault-troughs are identified in the Chenbei low uplift. The paleo-valleys are further subdivided into V shape,U shape,W shape. Fan deltas,semi-deep lacustrine and deep lacustrine is developed in steep slope zone of Chengbei low uplift,which presents isolated lob shape in plane distribution. Braided river delta,shore-shallow,semi-deep lacustrine and deep lacustrine is mainly developed in gentle slope belt,which is featured with wide and continuous plane distribution and superimposed vertical distribution. The characterization of elements in source-to-sink system indicates that volume of depositional systems is closely related to drainage area,length,width,width/length of paleo-valleys. Coupling mode of the source-to-sink system suggests that effective source area controls the size of sedimentary system;sand transporting path controls sedimentary distribution direction and shape. |
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| Keywords: | source-to-sink system Paleogene quantitative analysis sedimentary system Chengbei low uplift |
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