四棵树凹陷储层岩性多为中-细砂岩,独山子地区岩性复杂。研究区总体储层较发育,以沙湾组和紫泥泉子组储层最好,根据录井、岩石薄片、铸体薄片鉴定、压汞、物性分析等资料,对研究区古近系—新近系储层岩性特征、物性特征。根据X衍射、薄片分析等资料确定研究区所处的成岩作用阶段。 The lithology of the Shikushu sag is mostly medium-fine sandstone, while the lithology of the Dushanzi area is complex. The reservoir in the study area is more developed, and the reservoir is the best in Shawan Formation and Zijinquanzi Formation. Based on the data of well logging, rock slice, casting thin slice identification, mercury intrusion and physical property analysis, Department of reservoir lithology, physical characteristics. Based on X-ray diffraction and thin-slice analysis, the diagenetic stage of the study area is determined.