| 远源细粒辫状河心滩坝演化与河流分叉的交互沉积过程:现代沉积启示与数值模拟分析 |
| |
| 引用本文： | 甘泉.远源细粒辫状河心滩坝演化与河流分叉的交互沉积过程:现代沉积启示与数值模拟分析[J].地质科技通报,2021,40(1):14-26. |
| |
| 作者姓名： | 甘泉 |
| |
| 作者单位： | 中国地质大学（武汉）资源学院 |
| |
| 基金项目： | 中央高校基本科研业务费专项资金CUG150616 |
| |
| 摘 要： | 远源细粒辫状河广泛发育于河流的中下游,其形成的致密储层是深入挖潜油气面临的挑战。结合现代远源细粒辫状河演变的遥感记录影像,运用基于泥沙水动力学的沉积过程数值模拟软件Delft3D正演远源细粒辫状河的生长演化过程,并探讨物源供给对远源细粒辫状河形态的影响,深入剖析和解释远源细粒辫状河心滩坝演化与河流分叉的交互作用和沉积过程,并进行了现代沉积验证。研究表明:①河道沿下游方向由窄变宽是触发远源细粒辫状河形成的主要地形条件。河流流速和河岸牢固程度是决定河流宽度的重要因素。②远源细粒辫状河心滩坝演化与河流分叉的交互沉积过程是心滩坝泥沙与河流流水交互作用的沉积演化过程。心滩坝泥沙与河流流水交互作用具体包括泥沙在河流中的沉积作用和河流对泥沙的侵蚀作用。③远源细粒辫状河心滩坝演化与河流分叉的交互沉积过程包括3种:河道内心滩坝加积导致河流分叉、心滩坝与河岸分离导致河流分叉、心滩坝的局部冲裂分解导致河流分叉。该研究丰富了远源细粒辫状河沉积理论,并且有助于分析远源细粒辫状河沉积相的储层空间展布规律并应用于油气的深入勘探开发。
|
| 关 键 词： | 远源细粒辫状河 Delft3D沉积数值模拟 Google Earth 物源供给 河流分叉 |
| 收稿时间： | 2019-11-25 |
Interaction and sedimentary process between the evolution of the bar and bifurcation of the river in the far-source fine-grained braided river: Numerical simulation analysis inspired by modern deposition |
| |
| Gan Quan.Interaction and sedimentary process between the evolution of the bar and bifurcation of the river in the far-source fine-grained braided river: Numerical simulation analysis inspired by modern deposition[J].Bulletin of Geological Science and Technology,2021,40(1):14-26. |
| |
| Authors: | Gan Quan |
| |
| Affiliation: | (School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China) |
| |
| Abstract: | The far-source fine-grained braided river is widely distributed in the middle and lower reaches of the river.The tight oil and gas reservoir formed by the far-source fine-grained braided river is hard for further exploration of potential oil and gas.Combined with the remote sensing image of the modern far-source fine-grained braided river, the growth and evolution process of the far-source fine-grained braided river was modeled by the numerical simulation software Delft3D based on sediment hydrodynamics.The influences of the river discharge and the supply of mud and sand on the morphology of the far-source fine-grained braided river are simulated.The interaction and sedimentary process between the evolution of the bar and the bifurcation of the river in the far-source fine-grained braided river are analyzed and verified.The main findings are as follows:①The widening of the channel along the downstream direction is the main topographic condition that triggers the formation of the far-source fine-grained braided river.The flow velocity and bank firmness are important factors to determine the river width.②The interaction and sedimentary process between the evolution of the bar and bifurcation of the river in the far-source fine-grained braided river are a sedimentary evolution process of the interaction between the sediment of the bar and the flowing water of the river.The interaction between the sediment of the bar and the flowing water of the river includes deposition of sediment in the river and erosion of sediment by the river.③The aggradation of the bar in the river, the separation of the bar and bank, and the river avulsion are the three main forms of the interaction and sedimentary process between the evolution of the bar and the bifurcation of the river in the far-source fine-grained braided river.This paper enriches the theory of sedimentation of the far-source fine-grained braided river.This study is helpful to analyze the spatial distribution of reservoirs in the far-source fine-grained braided river sedimentary facies and to apply it to the in-depth exploration and development of oil and gas. |
| |
| Keywords: | far-source fine-grained braided river numerical simulation of depositional process using Delft3D Google Earth source supply river bifurcation |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
|
点击此处可从《地质科技通报》下载全文 |
