岩性油气藏 ›› 2022, Vol. 34 ›› Issue (3): 93–103.doi: 10.12108/yxyqc.20220309

• 地质勘探 • 上一篇    下一篇

辽东湾坳陷东北部新近系馆陶组辫曲过渡型河流沉积特征

李晓辉, 杜晓峰, 官大勇, 王志萍, 王启明   

  1. 中海石油 (中国) 有限公司天津分公司, 天津 300459
  • 收稿日期:2021-09-15 修回日期:2021-10-18 出版日期:2022-05-01 发布日期:2022-05-12
  • 第一作者:李晓辉(1990-),男,硕士,工程师,主要从事层序地层与沉积储层方面的研究工作。地址:(300459)天津市滨海新区海川路2121号。Email:lixh79@cnooc.com.cn。
  • 基金资助:
    中海石油（中国）有限公司科技重大专项“渤海上产4000万吨新领域关键技术”（编号：CNOOC-KJ135ZDXM36TJ08TJ）资助

Sedimentary characteristics of braided-meandering transitional river of Neogene Guantao Formation in northeastern Liaodong Bay Depression

LI Xiaohui, DU Xiaofeng, GUAN Dayong, WANG Zhiping, WANG Qiming   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2021-09-15 Revised:2021-10-18 Online:2022-05-01 Published:2022-05-12

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摘要： 辫曲过渡型河流是发育于辫状河向曲流河演化过程中的一种河流类型。综合现代沉积类比、构造演化分析、岩心分析与地震正演，对渤海湾盆地辽东湾坳陷东北部新近系馆陶组沉积体系类型及沉积演化规律进行了研究，并在层序分析的基础上，对馆陶组辫状河、曲流河与辫曲过渡型河流等3种沉积类型的宏观和微观沉积特征、成藏条件进行了对比。研究结果表明：①辽东湾坳陷东北部馆陶组沉积时期，沉积体系由辫状河向曲流河逐渐过渡，其中在馆中段沉积期发育辫曲过渡型河流沉积。②辫曲过渡型河流具有水动力较强、垂向加积与侧向加积相复合、储层发育程度与成熟度适中、砂泥岩低频互层、测井曲线呈箱形与钟形相叠加的沉积特征。③相对于辫状河与曲流河储层，辫曲过渡型河流储层横向连通性好，垂向上间隔发育规模性泥岩夹层，具备更好的储盖组合条件，更有利于油气规模性聚集成藏。

关键词: 辫曲过渡型河流, 辫状河, 曲流河, 沉积特征, 馆陶组, 新近系, 辽东湾坳陷

Abstract: Braided-meandering transitional river is a type of river developed in the process of braided river transforming to meandering river. Based on modern sedimentary analogy，tectonic evolution analysis，core analysis and seismic forward modeling analysis，the sedimentary system types and sedimentary evolution law of Neogene Guantao Formation in northeastern Liaodong Bay Depression of Bohai Bay Basin were studied. Under the control of sequence strata，the macro and micro sedimentary characteristics and reservoir accumulation conditions of three sedimentary systems of Guantao Formation，including braided river，meandering river and braided-meandering transitional river，were compared. The results show that： （1）During the sedimentary period of Guantao Formation in northeastern Liaodong Bay Depression，the sedimentary system gradually transited from braided river to meandering river，and braided-meandering transitional river developed in the middle Guantao Formation.（2）The braided-meandering transitional river are characterized by strong hydrodynamic force，combined vertical accretion and lateral accretion，moderate reservoir development and maturity，low-frequency interbedded sandstone and mudstone，and superposition of box-shaped and bell-shaped logging curves.（3）Compared with the reservoirs of braided river and meandering river，the braided-meandering transitional river reservoirs have better lateral connectivity，large-scale mudstone interlayers developed at vertical intervals，and better reservoir-cap assemblage conditions，which determines that they are more conducive to large-scale hydrocarbon accumulation.

Key words: braided-meandering transitional river, braided river, meandering river, sedimentary characteristics, Guantao Formation, Neogene, Liaodong Bay Depression

中图分类号: 

  • TE121
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