Lots of dissolution occured in paleogene strata in Xihu Sag,and feldspar is very important content,which be dissolutted,in many kind framework grain.

• 西湖凹陷古近系储层砂岩发育有较为普遍的溶解作用,长石是各种类型的骨架颗粒中最为重要的被溶解的组分。