分支河流体系的概念及其对油气勘探开发的意义

摘要

主要介绍分支河流体系(DFS)的基本概念、特征及其研究意义.分支河流体系是在运用Google Earth对全球700余个现代沉积盆地中的冲积河流沉积体系进行统计的基础上提出的新术语,它主导了所有现代沉积盆地的沉积区,在挤压、拉张和走滑等背景条件下都有发育.分支河流体系具有6条判别标准,其表面的河道体系有6种类型,而分支河流体系自身有5种终端类型.分支河流体系的沉积模式可以显示出比单个河道相模式范围更大的河流沉积体系特征,对深入认识陆相含油气盆地的沉积体系及指导油气勘探等具有重要的意义.%The basic concepts,characteristics and research significance of distributive fluvial system (DFS) were introduced.The new geological term,DFS,is advanced recently,by statistically analyzing the sedimentary systems of alluvial rivers in more than 700 continental basins using Google Earth,and it dominates all sedimentation and develops in all tectonic settings,including compressional,extensional and strike-slipping.Six criteria of discrimination ofDFS,six planform types on DFS and five terminal types of DFS were recognized.The DFS sedimentary model can show the characteristics of fluvial depositional system in a larger range than the single channel facies model,which is of great significance to understand the sedimentary system of continental petroliferous basins and guide oil and gas exploration.