柴达木盆地格尔木扇河网密度沿程变化规律
- 收稿日期:
2024-04-12
- 网络出版日期:
2024-07-10
摘要: 摘 要 【目的】通过研究现代分支河流体系河网平面展布规律，预测地下河流相砂体储层分布，为储层建模提供知识库，指导油气勘探开发。【方法】利用Google Earth、Global Mapper和91卫图助手等地理信息软件，按照等间隔测线对格尔木河流扇河道条数与宽度信息进行采集，并进行河网密度（Dw）的计算，总结格尔木河流扇河网密度（Dw）沿程变化规律，分析河网密度（Dw）主控因素。【结果】（1）格尔木河流扇大致可分为近端、中部和远端三个相带，近端河网密度（Dw）范围为0.089-0.198，平均河网密度（Dw）为0.143，中部河网密度（Dw）范围为0.136-0.19，平均河网密度（Dw）为0.164，远端河网密度（Dw）范围为0.16-0.37，平均河网密度（Dw）为0.25；（2）河网密度（Dw）主控因素为构造运动和地貌因素；（3）构造运动和地貌因素的差异导致河网密度（Dw）的波动，反之，不同的河网密度（Dw）也可以用来识别和恢复地下古河道及古环境条件，指导油气勘探开发。【结论】格尔木河流扇河网密度（Dw）的研究促进了分支河流体系沉积学发展，对地下储层分布预测提供了新方法，为储层建模知识库提供了大量数据。
Variation of the drainage density of Golmud fan in Qaidam Basin
- Received Date:
2024-04-12
- Available Online:
2024-07-10
Abstract: Abstract:[Objective] By studying the distribution law of river network plane of modern distributive fluvial system,the reservoir distribution of underground fluvial sand-bodies is predicted, which provides knowledge base for reservoir modeling and guides oil and gas exploration and development. [Methods] By using modern geographic information software such as Google Earth, Global Mapper and 91Satellite Map Assistant, the number and width of Golmud fluvial fan channels were collected according to equal interval survey lines, and the drainage density (Dw) of Golmud fluvial fan was calculated, and the variation of the drainage density of Golmud fluvial fan was summarized, and the main controlling factors of drainage density (Dw) were analyzed. [Results and Discussions] (1)Golmud fluvial fan can be roughly divided into three phases: proximal, middle and distal. The proximal drainage density (Dw) ranges from 0.089-0.198, and the average drainage density (Dw) is 0.143. The middle drainage density (Dw) ranges from 0.136-0.19, and the average drainage density (Dw) is 0.164. The distal drainage density (Dw) ranges from 0.16 to 0.37, and the average drainage density (Dw) is 0.25; (2) The main controlling factors of drainage density (Dw) are tectonic movement and geomorphic factor; (3) The difference of tectonic movement and geomorphic factor leads to the fluctuation of drainage density (Dw). On the contrary, different drainage density (Dw) can also be used to identify and restore underground palaeochanne and paleoenvironmental conditions, and guide oil and gas exploration and development. [Conclusions] The study of drainage density (Dw) of Golmud fluvial fan promotes the development of sedimentology in distributive fluvial systems, providing a new method for prediction of underground reservoir distribution, and provides a large amount of data for reservoir modeling knowledge base.
点击查看大图
下载:
