豫西地区中元古界的沉积环境一直是人们研究的重点,但是并未单独针对兵马沟组上段发育的巨厚层砂岩进行沉积环境分析。通过实地踏勘并采集标本,采用多种粒度分析方法,在精细制作粒度概率值累积曲线,C-M图等的基础上,对豫西伊川地区兵马沟组上段发育的巨厚层砂岩进行沉积环境分析。粒度特征的分析结果表明:兵马沟组上段砂岩形成的沉积环境为扇三角洲前缘沉积,发育水下分流河道、支流间湾和河口沙坝等微相。 The depositional environment of the Mesoproterozoic in western Henan Province has been the focus of the study for a long time. However, the sedimentary environment of the extremely thick sandstone developed in the upper part of the Baojugou Formation was not analyzed separately. Through field survey and collection of samples, a variety of particle size analysis methods were used to analyze the depositional environment of the thick sandstone developed in the upper part of the Bingou Formation in the Yichuan area, western Henan, on the basis of elaborating the cumulative probability curve of grain size and CM maps. . The results of grain size analysis show that the sedimentary environment of the upper part of the Xingmaigou Formation is characterized by the deposition of fan delta front, the development of underwater distributary channel, tributary bay and sand bar of estuary.