The research area is mainly located in a delta plain environment including distributary braided channels, natural levees, flood basins, flatland morasses and distributary beaches.

• 在相分析的基础上，进一步研究了区内沉积微相的平面展布特征及其演化规律，认为区内山1期为近海湖泊辫状河三角洲，到山2期以后演化为内陆湖泊三角洲。