Meandering-delta facies can be divided into delta plain subfacies and delta front subfacies,and lacustrine facies can be divided into shore lacustrine subfacies and shallow lacustrine subfacies.

• 头台地区泉四段属曲流河三角洲和湖泊沉积体系,曲流河三角洲相分为三角洲平原和三角洲前缘2种亚相,湖泊相分为滨湖和浅湖2种亚相。