| 分异流体河口作用 |
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| 引用本文： | 曹宏.分异流体河口作用[J].沉积学报,1998,16(2):92-96. |
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| 作者姓名： | 曹宏 |
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| 作者单位： | 北京石油勘探开发科学研究院 北京 100083 |
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| 摘 要： | 鄂尔多斯盆地QW地区湖泊三角洲沉积特征与常规三角洲有所不同。水下分流河道砂体发育，在分流河道和水下分流河道的末端分别沉积有不同的河口砂坝复合体，它们共同构成三角洲前缘骨架。本文在对三角洲河口作用的研究作简要回顾的基础上，对比其它研究实例，对该区三角洲的形成机理进行了探讨，提出了分异流体河口作用的概念，并对其沉积体特征进行了分析。分异流体的主要特征是入注流体纵向上的载荷和速度差异分布，气候和沉积物供给是其主要影响因素。水下分流河道砂体发育和同期不同空间位置存在不同的河口砂坝是分异流体河口作用的重要沉积响应之一。
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| 关 键 词： | 三角洲 河口作用 分异流体 河口砂坝 |
| 收稿时间： | 1997-04-24 |
River Mouth Processes of Differentiated Fluid |
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| Institution: | Research Institute of Petroleum Exploration and Development, Beijing 100083 |
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| Abstract: | Lacustrine delta in QW area of Shanganning basin has a different characteristic from other traditional deltas. Subaqueous distributary channel sandbodies and mouth bars are well developed here, and mouth bar complexes locate both at the beginning and the end parts of the subaqueous distributary channels, these sandbodies build up the framework of the delta front. Sediments of subaqueous distributary channels are distinguishable from those in distributary channels of delta plain as those in thickness, depositional structures and well-logging curvesect. After reviewing the past researches on river mouth processes and comparing with some other similar studies, this paper introduces the concept of river mouth processes of differentiated fluid and different mouth bars respectively, and attempts to explain the developing mechanism of the lacustrine delta in QW area with this theory. The differentiated fluid is characterized by vertical loads and speed differentiated distribution, and mainly controlled by climate and quantities of sediments supporting. The results of river mouth processes are affected by basin structure and bottom geometry which may result in those stable moving forward or rapid downcutting of subaqueous distributary channels after the river water flew into the basin. Two different types of mouth bars can be distinguished by connecting microfacies or facies association. long drived subaqueous distributary channels and its terminal mouth bar complex together with the ordinary mouth bar complex may be the most important responses to the river mouth processes of differentiated fluid. |
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| Keywords: | delta\ river mouth process\ differentiated fluid\ mouth bar |
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