Coarse grain deposit feature of Guantao formation in western depression Shuyi area of Liaohe basin^①

来源期刊：中南大学学报(英文版)2005年第2期

论文作者：郭建华 刘辰生 朱美衡

文章页码：199 - 204

Key words：sedimentary features; wet alluvial fan; braid channel; debris flow deposit; Guantao formation; Liaohe basin

Abstract: The extensive distribution of coarse-grained clastic rock of Guantao formation in Shuyi area of Liaohe basin was considered as a result of fluvial deposit. According to the comprehensive analysis of seism data, well log,core observation and experimental data, this kind of clastic rock is composed of pebblestone-cobblestone, microconglomerate, sand conglomerate, medium-coarse grained sandstone and fine-sandstone. According to the clast composition, sedimentary texture, structure and rock type, 3 kinds of sediment facies can be recognized ie the mixed accumulation-conglomerate dominated debris flow, pebblestone-cobblestone dominated gradient flow and sandstone dominated braided stream. Vertically, the bottom gradient current deposit and top braided stream deposit form finingupward sediment sequence, and the debris flow deposit distributes in them at random. The sedimentary feature ofcoarse grain clastic of Guantao formation in Shuyi area is accordant with proximal wet alluvial fan deposited in wet climate at foreland and this kind of alluvial fan is different from the traditional one.