【摘要】 通过对港西油田产油气储层的岩石学、孔隙类型和孔隙结构特征等的研究,结合X-射线衍射和扫描电镜等的测试结果,分析了储层损害的潜在地质因素。结果表明,研究区储层砂岩主要为中细粒岩屑长石砂岩和长石岩屑砂岩,储集空间主要为粒间孔,孔喉类型为中孔中喉-中孔细喉型组合类型。填隙物中的石英、黄铁矿、碳酸盐矿物和粘土矿物是造成储层损害的主要敏感性矿物,潜在的损害主要为酸化过程中的新生沉淀物与脱落微粒、固体微体迁移和与地层水不配伍的流体造成的地层损害。更多还原

【Abstract】 This paper analyzes some damage factors of Gangxi Oilfield through analysis on petrologic characteristics,pore types,pore structure features,diagnosis and reservoir physical properties and in combination with the X-ray diffraction analysis,scanning electronic microscope(SEM)and test results of reservoir sensitivity.The results indicate that the sandstones are mainly mid-fine feldspathic litharenite and lithic feldspar sandstone with medium hole-medium throat and medium hole-small throat.The clay minerals in sandstone fillings are the main factors causing the sensitive damage to reservoirs.These minerals mainly cause the formation damage including quartz,pyrite,carbonate minerals and clay mineral.Potential damage mainly includes shedding particles caused by acidification,solid particles migration,and precipitation and scaling caused by the incompatibility between injection and formation waters.更多还原