现代地质2011，Vol.25Issue(4)：642-649,8.
北京北部上侏罗统辫状河体系沉积特征
Sedimentary Characteristic of Braided River of Upper Jurassic Outcrops in North of Beijing
摘要
Abstract
The sedimentary facies of the Upper Jurassic Houcheng Formation silicified wood outcrops in north of Yanqing area are interpreted jointly with sedimentary structure and characters of sedimentary sequence. This area mainly developed braided river deposits. The main sedimentary microfacies include channel, channel bar, pond and overflow deposits. Two stratigraphic cycles of increasing and decreasing accommodation/sediment supply ( A/S) regimes are identified. The two mid-term cycles are divided into several short-term cycles. This paper summarized the characteristics of base-level cycle, and clarified how the stratigraphic stacking pattern changed with different A/S ratios. The connectivity of channel sand is good under low A/S ratio and vice versa. The thickness of overflow deposits can be seen as the judgment basis of accommodation as it increases with rising A/S ratio.关键词
辫状河/露头/沉积特征/基准面旋回/地层叠加样式/A/S比值/溢岸沉积Key words
braided river/ outcrop/ sedimentary characteristic/ base-level cycle/ stacking pattern/ A/S ratio/overflow deposits分类
能源科技引用本文复制引用
郭佳,邓宏文,季春辉,秦雁群..北京北部上侏罗统辫状河体系沉积特征[J].现代地质,2011,25(4):642-649,8.基金项目
国家“十一五”重大专项项目(2009ZX05009-002). （2009ZX05009-002）
