本文根据1977年在安县某水利工程勘测中搜集的资料,应用岩相古地理的理论和分析方法,研究了晚侏罗世莲花口组砾岩中一古冲积扇体的岩相特征、结构模式以及受其控制的某些岩溶发育规律,进而阐明了古扇上三条河流(何家沟、水磨河和干坝子河)的建坝条件。 Based on the data collected in a water conservancy project survey in An County in 1977, this paper studies the lithofacies characteristics and structural model of an ancient alluvial fan in Late Jurassic Lianhuakou Formation using the theory and analysis of lithofacies palaeogeography. As well as some karst development rules controlled by them, and then clarifies the conditions for the dam construction of the three rivers in Ancient Fanshan (Hejiagou, Shuimohe and Ganbazihe).