摘要
注水开发油田储层水淹后的电性特征主要表现为电阻率下降,准确恢复其原始电阻率是进行水淹级别判断的关键.研究区渤海LD油田地层原始电阻率受沉积环境和构造高度影响,因此提出了基于解释单元进行水淹层原始电阻率反演方法.该方法以测井资料为基础,首先通过图论多分辨率聚类分析结合沉积微相将关键井划分测井相,接着在此基础上细分解释单元,然后建立每一个解释单元原始地层电阻率模型,最后将建立的方法模型应用于实际新钻的调整井.准确恢复地层原始电阻率后求取原始含油饱和度,并结合目前剩余油饱和度得到储层的驱油效率,达到水淹级别定量评价的目的.新钻21口井的资料处理表明:水淹层定量解释与实际生产情况符合率高达93.7%,是渤海油田复杂水淹层定量解释的一种有效手段.
In the waterflooded oilfield, the main characteristics of water-flooded zone is the decrease of resistivity. Accurate recovery of the original resistivity is the key to identify water-flooded zone flooding level. It is considered that formation original resistivity of the Bohai LD oilfield is affected by sedimentary environment and structure height. Therefore, a method of original resistivity inversion of water-flooded zones based on interpretation unit is represented. Based on logging data, first, logging facies is divided in combination with sedimentary microfacies using Multi-Resolution Graph-based Clustering;secondly, interpretation unit is subdivided on this basis;then, the original formation resistivity model of each interpretation unit is established;finally, the established method model is applied to the new adjustment well. After accurately restoring the original resistivity, the original oil saturation can be obtained, then the remaining oil saturation is combined to evaluate quantitatively oil displacement efficiency for dividing the reservoir flooding level. By explaining the actual 21 new drilling wells data, the quantitative interpretation results of water-flooded zone are in good agreement with the actual production, and the total coincidence rate is up to 93.7%, so it provides an effective way for quantitative interpretation of complex water-flooded zone.
作者
刘欢
徐锦绣
高文博
时新磊
LIU Huan;XU Jin-xiu;GAO Wen-bo;SHI Xin-lei(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)
出处
《地球物理学进展》
CSCD
北大核心
2019年第1期144-150,共7页
Progress in Geophysics
基金
国家科技重大专项"渤海油田加密调整及提高采收率油藏工程技术示范"(2016ZX05058001)资助
关键词
水淹层
原始电阻率
测井相
解释单元
定量评价
Water-flooded zone
Original resistivity
Logging facies
Interpretation unit
Quantitative evaluation
