高精度碳氧比能谱测井在柳赞油田的应用

Application of high precision C/O energy spectral logging in Liuzan oilfield

柳赞油田断裂构造发育,油水关系复杂,水淹层水淹程度差异大,剩余油分布复杂,认识难度大,新井投产和老井作业效果不理想。为了正确认识储层,寻找剩余油饱和度相对富集层位,2008年8月以来应用高精度碳氧比能谱测井仪,对该油田15口井进行了测井分析。应用结果表明,利用高精度碳氧比能谱测井资料,能够重新对某些储层进行正确评价,确定剩余油分布并判断水淹层级别,经解释,柳赞-1井27号层为剩余油富集区,柳赞-2井22号层为上油水同层下水层,柳赞-3井14号层为上中水淹层下较强水淹层,9口井采取了新的生产措施,累积增油量为2 560t,综合含水率下降了30.6%。据此,重新作业井的解释符合率达100%。

The Liuzan oilfield is characterized by well developed faults,complex oil-water contact,highly variable flooding situation,and complex distribution of remaining oil,therefore,it is difficult to understand and manage,moreover,the performance of new production wells and old wells is not satisfactory.In order to understand the reservoir correctly and locate the remaining oil in relatively high saturation layers, the high-precision C/O energy spectral logging is applied in August,2008,and 15 wells in this field were analyzed.The application results show that the high-precision carbon and oxygen spectral logging can re-evaluate some of the reservoir more properly,and may determine the distribution of remaining oil and levels of water flooding situation.According to the explanation,the layer 27 of well Liuzan- 1 is well saturated with remaining oil,and 22 layer of well Liuzan-2 is upper oil-water mixture and bottom water,and the 14 layer of well Liuzan-3 is upper water-flooded and bottom high flooded.9 wells are taken new enhancing measures according to the new understanding, and the cumulative incremental oil is2 560t,composite water cut has dropped by 30.6%.Accordingly,the interpretation of reoperation well obtains 100%.