运用岩心观察、薄片鉴定、测井资料分析、物性分析和地球化学分析方法,研究了准噶尔盆地西北缘二叠系风城组白云岩储层的岩石类型和白云岩化作用特征,讨论了白云岩化作用对储层的改造。认为准噶尔盆地西北缘二叠系风城组白云岩储层岩性复杂,有泥质、粉砂质和凝灰质白岩化岩类,发育白云岩化作用、去白云岩化作用和溶蚀作用;白云岩化作用和溶蚀作用对储层的改造具有积极的建设性作用,去白云岩化作用对储层物性具破坏作用;白云岩化地层物性明显优于相邻的非白云岩化地层的物性而成为相对的优质储层。通过白云岩化类储层和非白云岩化储层物性数据对比分析,认为白云岩化可使储层的孔隙度增加2%~8%。 Using the methods of core observation, thin slice identification, logging data analysis, physical property analysis and geochemical analysis, the authors have studied the rock types and dolomitization characteristics of the Permian Fengcheng Formation dolomite reservoir in the northwestern margin of the Junggar Basin. Reconstruction of reservoir. The dolomite reservoirs of the Permian Fengcheng Formation in the northwestern margin of the Junggar Basin are characterized by complex lithologies with dolomitic, dolomitization, dolomitization and dissolution. The lithification and dissolution have a positive and constructive effect on the reservoir alteration, and dolomitization can have a devastating effect on the reservoir properties. The physical properties of the dolomitization formations are obviously better than those of the adjacent non-dolomitized formations Become relatively high-quality reservoir. Based on the comparison of physical data between dolomitized reservoirs and non-dolomitized reservoirs, it is considered that dolomitization can increase the porosity of reservoirs by 2% -8%.