摘要
岩心测试结果表明，塔河缝洞型碳酸盐岩油藏基岩块中微裂缝发育，在长度约5am的岩心中明显可见微裂缝约5～20条，微裂缝交替成网络状分布，但充填程度较高。74％的岩心渗透率低于0．1×10^-3μm。26％的岩心渗透率分布在0．1×10^-3～5×10^-3μm^2之间，孔隙度分布在1％。2％范围内。CT显示基岩块中微裂缝发育，薄片资料显示在岩心内部存在极少数粒间孔、溶蚀孔。NMR测试平均可动流体饱和度为30．17％，可动流体主要存在于微裂缝之中。岩块的渗储能力主要由基岩块中的微裂缝贡献。基于对储层的认识，微裂缝发育的塔河碳酸盐岩油藏基岩块可以视为一种微裂缝为储渗空间的等效连续介质。以该等效连续介质为基础，可与主裂缝系统构成双重介质模型，或与主裂缝、溶洞系统构成复杂介质模型。
Cores test indicates that micro-fractures develop in base rock in fraetured-vuggy carbonate rock reservoirs in Tahe Oilfield with 5 -20 obvious micro-fractures in 5cm-long core and show network distribution with high filling degree. Permeability of 74% cores is less than 0. 1 × 10^-3μm^2, permeability of 26% cores is 0. 1 × 10^-3 - 5 × 10^-3 μm^2 and porosity distribution is between 1% -2%. CT shows that micro-fractures develop in base rock block and thin slice data shows that few intergranular pores and corroded pores exist in cores. NMR test gets 30. 17% of average saturation of mobile fluid, and mobile fluid mainly exist in micro-fractures. Permeability and storage capability of rock blocks mainly depend on micro-fractures in base rock blocks. Based on the understanding of reservoirs, base rock blocks in carbonate rock reservoirs of Tahe Oilfield with developed micro-fractures can be considered as equivalent continuous medium, in which micro-fractures are storage and permeable space. AS the basis, this continuous medium can form double-medium model combined with main fracture system or form complex medium model with main fracture and vug system.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2009年第4期35-38,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
基金项目：国家“973”项目“碳酸盐岩缝洞型油藏开发基础研究”（2006CB202404）资助.
