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湖盆砾质滩坝沉积序列及其成因——以青海湖东南岸现代滩坝沉积为例

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孟旺才, 陈玉宝, 陈立军, 李欣伟. 2020. 湖盆砾质滩坝沉积序列及其成因——以青海湖东南岸现代滩坝沉积为例. 西北地质, 53(3): 56-65. doi: 10.19751/j.cnki.61-1149/p.2020.03.004
引用本文: 孟旺才, 陈玉宝, 陈立军, 李欣伟. 2020. 湖盆砾质滩坝沉积序列及其成因——以青海湖东南岸现代滩坝沉积为例. 西北地质, 53(3): 56-65. doi: 10.19751/j.cnki.61-1149/p.2020.03.004
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MENG Wangcai, CHEN Yubao, CHEN Lijun, LI Xinwei. 2020. Study of Sedimentary Succession and Its Origin of Gravel Beach Bar: A Case from the Modern Beach Bar in the Southeastern Qinghai Lake. Northwestern Geology, 53(3): 56-65. doi: 10.19751/j.cnki.61-1149/p.2020.03.004
Citation: MENG Wangcai, CHEN Yubao, CHEN Lijun, LI Xinwei. 2020. Study of Sedimentary Succession and Its Origin of Gravel Beach Bar: A Case from the Modern Beach Bar in the Southeastern Qinghai Lake. Northwestern Geology, 53(3): 56-65. doi: 10.19751/j.cnki.61-1149/p.2020.03.004
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湖盆砾质滩坝沉积序列及其成因——以青海湖东南岸现代滩坝沉积为例

  • 1. 陕西延长石油(集团)有限责任公司研究院, 陕西 西安 710069;

  • 2. 延长油田股份有限公司科技部, 陕西 延安 716000;

  • 3. 延长油田股份有限公司勘探开发技术研究中心, 陕西 延安 716000

  • 基金项目:

    国家科技重大专项“大型油气田及煤层气开发”（2011ZX05003-001）资助

详细信息
    作者简介: 孟旺才(1968-),男,甘肃秦安人,正高级工程师,主要从事石油地质研究。E-mail:mengwangcai@126.com

  • 中图分类号: TE121.3

Study of Sedimentary Succession and Its Origin of Gravel Beach Bar: A Case from the Modern Beach Bar in the Southeastern Qinghai Lake

  • 1. Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710069, Shaanxi, China;

  • 2. Ministry of Science and Technology, Yanchang Oil Field Co., Ltd., Yan'an 716000, Shaanxi, China;

  • 3. Exploration and Development Technology Research Center, Yanchang Oil Field Co. Ltd., Yan'an 716000, Shaanxi, China

    摘要
  • 现代是过去的钥匙。笔者在青海湖野外实地考察的基础上，通过探槽对青海湖东南岸现代滩坝进行平行湖岸线及垂直湖岸线精细解剖，总结了砾质滩坝的沉积特征及序列，并解释了沉积序列的成因。青海湖东南岸砾质滩坝岩性主要为中砾岩、细砾岩及粗砂岩；低角度冲洗交错层理、平行层理、块状层理、正递变层理；砾质滩坝具有固定的“ABC”沉积序列。A段为序列的底部，由粗砂和砾石组成，颗粒呈次圆状，分选较差，块状，砾石定向的漂浮于粗砂中；B段为序列的中部，由砾石组成，颗粒呈次圆状，分选较好，块状；C段为序列的顶部，由粗砂组成，分选较好，正粒序。砾质滩坝形成的水动力条件可以分为3个带，波浪不对称带，破浪带和冲浪带。波浪不对称带形成“A段”，破浪带形成“B段”，冲浪带形成“C段”。
    Based on the field investigation into Qinghai Lake, the author summarized the sedimentary characteristics and successions of gravel beach bar and analyzed the origin of sedimentary successions by means of trenching technology. The lithology of the gravel beach bar in the southeastern part of the Qinghai Lake is mainly medium conglomerates, fine conglomerates and coarse sandstones. The sedimentary structures are mainly low-angle swash bedding, parallel bedding, massive bedding and normally graded bedding. Gravel beach bar display an “ABC” sequence. “A” interval, the bottom of the sedimentary succession, is composed of coarse sands and gravels, which are sub-rounded, poorly-sorted, massive, and gravels oriented floating in the coarse sands; “B” interval, the middle of the sedimentary succession, is composed of gravels, which are sub-round, well-sorted, and massive bedding; “C” interval, the top of the sedimentary succession, is composed of coarse sands, which are well-sorted and normally graded bedding. The hydrodynamic conditions formed by gravel beach bar can be divided into three zones, i.e. asymmetric wave zone(A interval), breaking wave zone (B interval )and surfing wave zone (C interval).
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收稿日期:  2019-11-03
修回日期:  2020-03-10

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