古地理学报 ›› 2023, Vol. 25 ›› Issue (4): 872-888. doi: 10.7605/gdlxb.2023.04.064

• 岩相古地理学及沉积学 • 上一篇    下一篇

湖相碳酸盐岩礁滩体系沉积特征、主控因素及成因模式: 以东营凹陷西部沙四上亚段为例*

刘圣乾1, 何幼斌1, 姜在兴2, 罗进雄1, 朱雪清1, 朱青1, 唐卫3   

  1. 1 长江大学地球科学学院,湖北武汉 430100;
    2 中国地质大学(北京)能源学院,北京 100083;
    3 地大汇能(北京)科技有限公司,北京 100085
  • 收稿日期:2023-03-27 出版日期:2023-08-01 发布日期:2023-08-11
  • 作者简介:刘圣乾,男,1990年生,副教授,从事沉积学方面的教学及科研。E-mail: liusq@yangtzeu.edu.cn。
  • 基金资助:

    *国家自然科学基金项目(编号: 41902117)资助

Sedimentary characteristics, dominant factors and genetic model of lacustrine carbonate reef-shoal depositional system: a case study from the upper 4th Member of Shahejie Formation in western Dongying sag

LIU Shengqian1, HE Youbin1, JIANG Zaixing2, LUO Jinxiong1, ZHU Xueqing1, ZHU Qing1, TANG Wei3   

  1. 1 School of Geosciences,Yangtze University,Wuhan 430100,China;
    2 School of Energy,China University of Geosciences(Beijing),Beijing 100083,China;
    3 Dida Huineng(Beijing)Technology Co. Ltd., Beijing 100085, China
  • Received:2023-03-27 Online:2023-08-01 Published:2023-08-11
  • About author:LIU Shengqian,born in 1990,associate professor,is engaged in research and teaching on sedimentology. E-mail: liusq@yangtzeu.edu.cn.
  • Supported by:

    Financially supported by the National Natural Science Foundation of China(No.41902117)

摘要:

湖相碳酸盐岩广泛存在于陆相湖盆之中,大型礁滩沉积体系的发育模式对湖相碳酸盐岩成因机理的研究具有重要意义。基于钻井岩心、薄片、测录井、地震以及地球化学测试等资料,分析了东营凹陷西部沙四上亚段湖相碳酸盐岩沉积特征。结果表明: 研究区常见7种岩石类型及4种岩性组合,可识别出藻礁、浅滩、灰泥坪及风暴沉积4种沉积微相。藻礁和浅滩共同构成湖相礁滩复合沉积体系,主要发育于碳酸盐岩台地顶部,相带主体呈NE-SW向展布; 灰泥坪主要发育于台地内部及剥蚀区附近; 风暴沉积在台地东南斜坡区上部较为发育。从高位域早期至晚期,礁滩体系由垂向加积为主演化为逐步发生侧向迁移,平面展布规模逐渐扩大至斜坡区上部。推测区域和全球相对温暖气候背景、古东亚季风气候条件下盛行的东南风、盆地构造及古地貌、湖平面升降、碳酸盐岩母岩风化及海侵作用等共同控制了该湖相礁滩体系的形成及演化。在此基础上,提出湖相碳酸盐岩“气候—物源—盆地”系统成因模式,丰富了对湖盆大规模礁滩沉积体系形成机理的认识。

关键词: 东营凹陷, 沙河街组, 湖相碳酸盐岩, 礁滩体系, 古东亚季风, 沉积模式

Abstract:

Lacustrine carbonates are widely distributed in continental lacustrine basins. The development model of a large reef-shoal depositional system is of great significance for understanding the genetic mechanism of lacustrine carbonates. Based on drilling cores,thin sections,well-log,seismic data and geochemistry measurements,the sedimentary characteristics of lacustrine carbonates in the upper Member 4 of Shahejie Formation(Ess4)of the Dongying sag were analyzed in detail. The results show that seven rock types and four lithologic assemblages were developed in the study area,and four types of sedimentary microfacies, including algal reef,shallow shoal,mudflat and storm deposits can be identified. The algal reef and shallow shoal constitute the reef-shoal complex depositional system,which was mainly distributed in the NE-SW direction of the top of the carbonate platform. The mudflat was mainly developed in the platform and near the denudation area,while the storm deposits were distributed in the upper part of the southeast slope of the platform. From the early to late stage of the highstand period,the reef-shoal complex system gradually migrated laterally from the former vertical accretion,and the plane distribution gradually expanded to the upper part of the slope area. It was speculated that the warm climate,the prevailing southeast wind of the palaeo-East Asian monsoon climate,basin structure and palaeogeomorphology,lake level fluctuation,carbonate weathering and seawater transgression integrated controlled the formation and evolution of the lacustrine reef-shoal system. The “climate-provenance-basin”genetic model for lacustrine carbonates was proposed in this paper,which can enrich the understanding of the formation mechanism of large-scale reef-shoal depositional system in lacustrine basins.

Key words: Dongying sag, Shahejie Formation, lacustrine carbonates, reef-shoal depositional system, palaeo-East Asian monsoon, depositional model

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