【摘要】 鄂尔多斯盆地延川地区延长组长2属于低孔—特低渗砂岩储层。在岩心观察及薄片分析的基础上,应用扫描电镜、高压压汞等多种实验手段,分析长2储层岩石学及微观孔喉结构等基础地质特征。结合研究区储层的特点,提出运用聚类分析—灰色关联法联合的方法对延长组长2段储层进行综合评价,建立了长2储层的分类评价标准,实现了长2段储层定量划分及评价。结果表明:长2储层以长石砂岩为主,储集空间类型较为多样,以粒间孔和溶蚀孔最为发育,分别约占总储集空间的92%和6%,孔-喉组合以中小孔细喉型—小孔特细喉型为主。长2段储层可划分为4种不同类型,其中Ⅰ类、Ⅱ类是最为有利的储层,Ⅲ类和Ⅳ类储层则属于不利储层。更多还原

【Abstract】 The Chang 2 reservoir of the Yanchang Formation in the Yanchuan area of the Ordos Basin belongs to the ultra-low permeability sandstone reservoir.The geological characteristics of reservoir petrology and microscopic pore throat structure are analyzed by using experimental thin sections,scanning electron microscopy and high pressure mercury intrusion.On the basis of these,the cluster analysis—grey correlation method is proposed to comprehensively evaluate the Chang 2 reservoirs,and the classification evaluation criteria of the Chang 2 reservoirs are established.The results show that the Chang 2 reservoir is mainly composed of feldspar sandstone.There are various types of reservoir space,and the intergranular pores and dissolution pores are the most developed,accounting for 92% and 6% of the total storage space respectively.According to the standard,the Chang 2 reservoir is divided into four different types of reservoirs,of which Class I and Class II are the most favorable reservoirs,Class III and IV reservoirs are unfavorable reservoirs.更多还原