基于油藏精细描述的复杂小断块剩余油分布研究

Study on distribution of remaining oil of small complex fault block based on reservoir description

红南9块储层具有砂体构造复杂、油水关系复杂、井网不完善、底水锥进快、注水开发效果差等特点。亟需对该区块进行油藏精细描述,搞清剩余油的分布规律。基于高分辨率层序地层对比、储层构造和沉积微相研究,建立了反映油田客观实际的地质模型。运用油藏数值模拟技术,在历史拟合的基础上,综合分析了剩余油在平面和纵向上的分布规律。研究表明,红南9块剩余油分布主要受断层,底水锥进,储层非均质性、井网不完善平面和沉积微相的综合影响。平面上,剩余油分布在井网控制不住的区域、封闭断层附近以及微构造高点。纵向上,剩余油主要分布在K1S1、K1S2-7、J3K1-1、J3K1-7、J3K1-13、J3K1-20和J3K2-1油层。

In view of the characteristics of the complex structure of sand bodies, complex relation of water and oil, imperfect well pattern ,bottom water rapid coning, poor effect of injection water dcveiopment for Hong Nan 9 block, it＇s necessary to develop reservoir description and find out the law of rcmaining oil distribution. A geologic model which can reflect the objective reality of the reservoir is built up based on the study of high resolution stratigraphic correlation and ,eservoir structure and sedimentary micro faces. Then apply numerical simulation technology to analyse the law of remaining oil distribution in plane and vertical based on history matching. The research result show that the remaining distribution of Hong Nan 9 block is mainly effected by faults ,bottom water coning, well pattern and sedimentary micro faces. The remaining oils horizontally focus on the unswept regions by current well pattern, and the regions with sealing fault and high position of microstructures. In vertical the remaining oils mainly focus on the K 1S 1, K 1 $2-7, J3 K 1-1, J3 K 1-7, J3 K 1-13, J3 K 1-20 and J3 K2-1 oil layers~