超稠油油藏蒸汽吞吐末期剩余油分布规律研究

针对超稠油油藏,以油藏数值模拟技术为基础,分析了影响蒸汽吞吐效果的主要因素及吞吐末期剩余油分布规律,同时结合动态监测资料、地球物理测井技术和密闭取心等多种方法进行了验证。基于典型超稠油油藏精细地质模型和概念模型,定量分析了原油黏度、蒸汽干度、开发方式和储层非均质性对剩余油分布的影响。结果表明,平面上剩余油分布主要受井间蒸汽波及范围、井网不完善和边底水影响;纵向剩余油主要由层间非均质性及地层倾角控制。

Study of remaining oil distribution in super-heavy oil reservoir at late stage of steam stimulation

Based on reservoir simulation, various influential factors and remaining oil distribution at late stage of steam stimulation are analyzed for super-heavy oil reservoirs. And at the same time, verification is conducted, combined with dynamic monitoring data, geophysical well logging and sealed coring. On the basis of detailed geological model and conceptual model of super-heavy oil reservoir, the effects of oil viscosity, steam quality, injection-production mode and reservoir heterogeneity on the distribution of remaining oil have been quantitatively studied. The results show that the main factors affecting the remaining oil distribution include the sweeping efficiency of steam, imperfect well pattern and edge water and bottom water in plane. Vertically, the remaining oil is controlled by interlayer heterogeneity and stratigraphic dip.