湖泊三角洲砂体形成及演变的水槽实验初步研究

FLUME-EXPERIMENTAL STUDY ON THE FORMATION AND EVOLUTION OF LAKE DELTA SANDBODY

刘忠保 赖志云 汪崎生

Liu Zhongbao Lai Zhiyun Wang Qisheng

江汉石油学院, 湖北 江陵 434102

Jianghan Petroleum institute

作者模拟了湖泊三角洲砂体的湖退沉积过程。对实验过程中三角洲砂体的形成、主水流和三角洲砂体的迁移作了比较详细地描述;同时定量研究了不同湖水深度下洪水、中水和枯水对砂体的改造;最后尝试将湖盆内的砂体进行相带划分并进行了粒度分析。该实验主要得到如下认识:①湖水深度控制着三角洲砂体的形态和进积速率;②砂体的宽厚比可作为判断三角洲砂体形态的重要标志;③洪水对三角洲砂体的改造起决定性的作用。

In this paper,the modelling of formation and evolution of delta sandbodies is made with lake sedimentary environment in a condition of 3.5m×1.0m×0.6m flume and 5.0m×2.5m×0.6m basin.In addition,the authors model on the process of regression and progredation.The main achievements of such experimental studies can be concluded as:1)the geometry and deposition rate of delta sandbodies are controlled by water depth of lakes;2)the ratio of sandbody width/height is the key parameter for recognition of delta sandbody geometry and 3)the flood would play an important role for the deformation of the delta sandbodies.

https://doi.org/10.11781/sysydz199501034