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根据薄片观察、扫描电镜及X—衍射等资料的详细分析,中山涧油田延安组延9砂岩类型以长石岩屑质石英砂岩为主,具有成分成熟度较低、结构成熟度较差的特点,成岩作用处于晚成岩A期,主要成岩作用有压实—压溶、胶结充填和溶解作用。压实—压溶及胶结充填作用是导致砂岩孔隙丧失的主要原因。而溶解作用形成了次生孔隙,有效地改善了砂岩的孔隙结构,从而提高了储层的孔渗条件。
According to the detailed analysis of thin slice observation, SEM and X-ray diffraction, the Yanchang sandstone of Yan’an Formation of Zhongshan Stream Oilfield is dominated by feldspathic quartzite sandstone, which has the characteristics of low maturity and poor maturity of structure , Diagenesis is in late diagenetic stage A, the main diagenesis compaction - pressure solution, cementation filling and dissolution. Compaction - pressure-dissolving and cementation filling is the main reason for the loss of sandstone porosity. The formation of secondary porosity by dissolving effect can effectively improve the pore structure of sandstone and improve the porosity and permeability of the reservoir.