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华池—白豹地区长6油层组是重要的勘探目的层,其砂体发育,含油性较好,但储层物性差,均为低渗、特低渗透储层,是典型岩性—地层油藏。在岩心和沉积相分析的基础上,对大量砂岩样品进行铸体薄片、扫描电镜、X-衍射、压汞分析,结合测井、地震资料,对华池—白豹地区长6储层特征进行综合研究,认为长6储层岩石以细—极细粒长石砂岩为主,胶结物主要为粘土及碳酸盐岩,孔隙类型以原生粒间空隙为主,属于低—特低孔隙度,特低—超低渗储层。影响储层物性的主要因素有碎屑颗粒大小及结构、胶结物类型及含量、孔隙类型、成岩作用和沉积相类型。研究区长6油层组储层总体上以III类(差)储层为主。
The Chang 6 reservoir in the Huachi-Baibao area is an important target for exploration. Its sand bodies are well developed and contain good oil content, but poor reservoir properties, all of which are low-permeability and ultra-low permeability reservoirs and are typical lithologic-stratigraphic Reservoir. Based on the analysis of core and sedimentary facies, a large number of sandstone samples were cast thin slab, SEM, X-ray diffraction, mercury intrusion analysis, combined logging and seismic data, and the characteristics of Chang 6 reservoir in Huachi-Baibao area Comprehensive study shows that the Chang 6 reservoir rocks are mainly fine-fine grained feldspathic sandstones, while the cements are mainly composed of clays and carbonate rocks. The pore types are dominated by primary intergranular interstices, which are low-extra low porosity, Ultra-low permeability reservoir. The main factors influencing reservoir physical properties include the size and structure of the clastic particles, the type and content of cements, pore types, diagenesis and types of sedimentary facies. The reservoirs of Chang 6 reservoir in study area are generally dominated by Group III (poor) reservoirs.