The reservoir lithology of oil bearing Huagang formation on Sudi structural belt in Xihu depression is mainly lithic arkose,feldspathic litharenite and feldspathic quartzitic sandstone.

• 西湖凹陷苏堤构造带花港组油层储集岩主要为岩屑长石砂岩、长石岩屑砂岩、长石石英砂岩,岩屑含量较少,岩石成分成熟度和结构成熟度均较高。