中文摘要：

在综合利用岩心、测井、钻井等地质资料的基础上，通过岩心观察与描述及隔夹层分析，对志丹地区长2、长3段的沉积环境和砂体展布特征进行研究，认为长2段储层在河道加积作用下，自下而上砂体厚度增大，砂体侧向连越性变好，而长3段油层组的砂体呈现出与之相反的沉积变化规律。采用岩心分析测试和测井解释等方法进行储层评价，认为长2段储层的渗透率非均质性较强，长3段储层渗透率虽特别低，但其渗透率均质程度较高.

英文摘要：

Based on comprehensive analysis of core, logging, drilling and geological data, the sedimentary environ- ment and sand body distribution of Chang 2 and Chang 3 are studied through core observation and description and interlayer analysis. It indicates that sand body thickness increases from the bottom to the top, and sand body lateral connectivity becomes better in Chang 2 reservoir because of river aggradation. But Chang 3 reservoir sand body shows the opposite rules, reservoirs of Chang 2 and Chang 3 are evaluated by core analysis and log interpretation methods. The results show that the permeability non heterogeneity of Chang 2 reservoir is strong; permeability of Chang 3 is very low, but permeability heterogeneity is higher.