阿拉善地块东南缘与鄂尔多斯盆地西缘中、上奥陶统浊流演化及其与内波相互作用研究

项目名称： 阿拉善地块东南缘与鄂尔多斯盆地西缘中、上奥陶统浊流演化及其与内波相互作用研究

项目编号： No.41272119

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 李向东

作者单位： 昆明理工大学

项目金额： 95万元

中文摘要： 浊流沉积研究在经历了以野外露头研究为主建立浊流沉积理论；以深海调查为主建立扇模式和以沉积流体为核心展开新一轮的理论探索后。在深水沉积已成为当今油气地质理论发展趋势之一的形势下，充分利用沉积流体的最新研究成果，展开浊流沉积的野外露头研究，积极探索不同大地构造环境下浊流的演化，并建立相应沉积模式的时机已渐趋成熟。阿拉善地块东南缘与鄂尔多斯盆地西缘处于始特提斯与古亚洲洋的连接部位,中、上奥陶统浊流沉积类型丰富，同时又明显受到深水牵引流的改造，已成为有别于经典浊积岩的浊流演化研究的理想场所。本项目以该地区中、上奥陶统"特殊"浊积岩为研究对象，结合中国在世界深水沉积研究的优势领域-内波、内潮汐沉积，及时开展浊流演化及其与内波相互作用研究，有望在浊流沉积理论方面走向世界的前沿。同时对该地区的大地构造归属（阿拉善地块东南缘与鄂尔多斯盆地西缘的界线问题）、古生代贺兰坳拉谷等区域地质热点问题均具有重要意义。

中文关键词： 等深流；内波;内潮汐；层流沉积；水动力氧化；鄂尔多斯盆地

英文摘要： Under the situation of the researchment of deep-water deposits become one of the development of the petroleum geology, it is time for the study of evolution of turbidity currents under different tectonic environments and establish the corresponding sedimentary model using the latest research results about sedimentation fluid as the following resons: ① established the theory of turbidity current deposits based on outcrop observation; ② established submarine fan model based on the exploration and research of submarine; ③ the study of deposition mechanism and process around sedimentary fluid. The area located on the southeastern margin of Alxa block and western margin of Ordos basin is an ideal site for the study of turbidity currents evolution based on outcrop observation of turbidites which is different from dassic turbidites (with Bouma sequence). The reason is not only for the abundant turbidites with significant reworking by deep-water tractive currents in Middle and Upper Ordovician but also for tectonic position between Proto-Tethyan ocean and Paleo-Asian ocean. Here we forcus on turbidity current evolution and its interaction with internal waves depend on the special turbidites in study area and the study of internal-wave and internal-tide deposits in China, which is an advantage study area in deep-water d

英文关键词： contour current；internal-wave and internal-tide；laminar flow deposition；hydrodynamic oxic；Ordos basi