Xihu Trough is located at the east - northem East China Sea shelf basin, and Pinghu Forma tion (Eocene) is the key target in the basin.

• 西湖凹陷位于东海陆架盆地东北部，始新统平湖组是该地区重要目的层，本文针对平湖组主力含油气储层的四个成因类型；