胜利油区东营凹陷古近系(下第三系)沙河街组第三段上部夹于泥岩中的白云岩为泥晶白云岩和泥晶铁白云岩,由晶粒细小的他形—半自形粒状白云石组成。在沉积期后变化中经历了多种成岩作用改造,其中影响白云岩储集性的作用主要为溶蚀作用、重结晶作用和构造应力作用。其储集空间主要为微粒间孔、晶间孔、溶蚀孔和构造缝,为好—较好的储层 The dolomite in the upper part of the third member of the Shahejie Formation of the Paleogene (Neogene Tertiary) in the Shengli Oil Region, is a muddy dolomite and a calcitic iron dolomite. The dolomite is composed of small, Shape granular dolomite composition. During the depositional period, the diagenesis undergoes many diagenetic alterations. The effects on the dolomite reservoir are dissolution, recrystallization and tectonic stress. The reservoir space is mainly intergranular pores, intergranular pores, dissolution pores and structural seams, which are good-better reservoirs