【摘要】 本文在１：５万尤溪县等四幅区域调研工作的基础上，就本区广泛分布的梨山组沉积岩的沉积环境，通过沉积地层的基本层序划分、地方性剖面模式层序的建立及采用相分析，划分出辫状河及交织河沉积。辫状河沉积的河道宽、深比值大，沙滩及坝形成侧向连续的带状砂体。细粒沉积薄而少，多呈不连续状，构成“砂包泥”的宏观特征。交织河流具低梯度、低弯度、快速填积的低能河道及广阔的洪泛盆地，河道沉积的砂体在侧向上包含于细粒沉积物中。由于交织河流的河漫沼泽可能存在排水良好的缘故，形成不具开采价值的河漫沼泽型煤层（线）。更多还原

【Abstract】 This paper focuses on the discussion of the sedimentary environment of early Jurrassic sedimentary rocks in the Youxi area of Fujian Province on the basis of the results of the large-scale regional geological survey. In the paper the fundamental sequence of sedimentary strata in the area was divided and a model sequence of the regional sections was set up.The Jurassic sedimentary environment in the Youxi area was divided into both the braided river and anastomosing river deposition. The sandstone member of Lishan Formation (lower Jurassic)in the surveyed area was formed in the conditions of the braided river deposition, which can be divided into two main lithofacies(Gm and Sh factes),and a series of coalbearing microclastic rocks was formed in the conditions of anastomosing river deposition.更多还原