| 大型板状交错层理内部沉积物的分异 |
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| 引用本文： | 王泽中.大型板状交错层理内部沉积物的分异[J].矿物岩石,1997,17(1):71-76. |
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| 作者姓名： | 王泽中 |
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| 作者单位： | 江汉石油学院地质系 |
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| 摘 要： | 本文对取自长江上荆江三八滩大型板状交错层理内部同一细层不同部位的５个样品进行了粒度分析和矿物鉴定，结果表明，在同一细层内沉积物有明显的分异作用。细层中上部以中等粒径、低密度的颗粒为主，分选好。细层的下部和底部主要聚集沉积物的粗尾和细尾部分，因而分选较差。此外，密度较大的矿物亦趋于聚集在细层的底部。沉积物的这种分异主要是因为在沙波运移过程中矿物沿背流面发生重力分异且在背流面附近存在回流所致。大型板状交错层理内部沉积物的这种分异作用对认识其储集性能的层内非均质性有重要的意义
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| 关 键 词： | 大型板状交错层理 细层 沉积物分异 |
THE SEDIMENTS DIFFERENTIATION WITHIN A LARGE SCALE CROSSBEDDING LAMINA |
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| Wang,Zezhong.THE SEDIMENTS DIFFERENTIATION WITHIN A LARGE SCALE CROSSBEDDING LAMINA[J].Journal of Mineralogy and Petrology,1997,17(1):71-76. |
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| Authors: | Wang Zezhong |
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| Abstract: | It is discussed the sediments differentiation within a large scale crossbedding lamina by the means of grain size and mineral analysis in this paper. The samples were from a large scale crossbeding developed on the Sanba mid channel bar in the middle range of Changjiang River. The results show that the lighter and medium size grains concentrated on the upper part of the lamina whereas the heavier, coarse and fine size grains distributed on the lower part of a lamina. Therefor, the sorting of sediments is better on the upper than it does on the lower. The differentiation of the sediments was mainly caused by the gravity differentiation of minerals and the existance of back flow currents during the migration of sand dunes, which also affected the heteroge nities of porosity and permeability of the sand body within a reservoirs. |
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| Keywords: | large scale crossbedding lamina differentiation of sediments |
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