通过野外剖面观测及钻井岩心的详细观察，在岩石颜色、沉积构造、剖面结构、测井相等沉积相识别标志研究的基础上，将川南麻柳场—大塔场须家河组划分为辫状河三角洲和湖泊2 个沉积相，进一步在三角洲中识别出辫状河三角洲平原及辫状河三角洲前缘亚相，湖泊进一步划分为滨湖和浅湖亚相，并对各微相特征进行了详细研究。这些研究成果的取得，可以更详尽地了解川南须家河时期的沉积环境，为川南地区须家河组的油气勘探提供基础地质资料。

Based on detailed field outcrop profiles and the core drilling observation, combining with the rock color, sedimentary structures, profile structures and log facies, the sedimentary facies of Xujiahe Formation in Maliuchang-Datachang area of southern Sichuan Basin is analyzed. There are two kinds of sedimentary facies which are braided delta and lacustrine facies. Furthermore, the braided delta is divided into braided delta plain and braided delta front sub-facies, and the lacustrine facies is divided into coastal lake and shallow lake sub-facies. The characteristics of sedimentarymicrofacies are studied. The study results are useful to detailedly understand the depositional environment during the period ofXujiahe Formation, and provide basic geologic data for oil and gas exploration in southern Sichuan Basin.