The Dujiatai oil layers in the Shu 266 fault block are fan delta front facies, locating on the edge of the fan delta front in the areal.

• 曙266断块杜家台油层为扇三角洲前缘亚相沉积，平面上位于扇三角洲前缘的端部，主要微相为水下分流河道与水下分流间湾。