AS油田WY区特低渗透油藏水淹层评价方法  

Method for Water-Flooded Layer Evaluation in Extra-Low Permeability Reservoir in WY Block of AS Oilfield Flooded by Fresh-Water

作　　者：惠钢[1] 王友净[1] 闫林辉[1] 李佳鸿[1] 刘丽[1] HUI Gang;WANG Youjing;YAN Linhui;LI Jiahong;LIU Li(Research Institute of Petroleum Exploration and Development, PetroChina, Haidian, Beijing 100083, China)

机构地区：[1]中国石油勘探开发研究院,北京海淀100083

出　　处：《西南石油大学学报（自然科学版）》2016年第6期138-146,共9页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：AS油田WY区特低渗透油藏的原始地层水矿化度很高,长期注淡水开发导致油层的电阻率呈现不对称U型曲线特征,强水淹油层的电阻率甚至高于原始油层的电阻率。特低渗透油藏水淹规律的影响因素复杂以及受储层本身特征的影响,适合中、高渗储层剩余油评价测井方法不适用于特低渗透水淹层评价。在岩电实验的基础上,明确了特低渗透油藏淡水驱水淹层机理。即当注入淡水的电阻率大于地层水电阻率时,且当其比值足够大时,水淹层电阻率明显高于原始油层,即出现U型曲线现象。根据常规测井曲线及岩芯分析资料,通过地层水矿化度与自然电位幅度、电阻率、声波时差等测井曲线组合进行了水淹层定性识别,探讨了地层混合液电阻率的求取方法,建立了淡水驱水淹层的定量解释模型。解释结果与试油投产符合率达85%以上。The formation water is of extremely high salinity in the extra-low permeability reservoir in WY Block of AS Oilfield.After the long term water-flooding, the oil layer resistivity curves display an asymmetric U-Type and the resistivity ofseverely water-flooded oil layer exceeds that of original oil layer. The traditional logging evaluation approach for medium-highpermeability reservoir does not apply to extra-low permeability reservoir, owing to the complicated factors of water floodingin the extra-low permeability reservoir and reservoir characteristics. The rock- electric experiment is carried out under the simulatedreservoir conditions to indicate the logging mechanism of water flooding in the extra-low permeability reservoir. Theresistivity value of water-flooded oil layer depends on the resistivity ratio between injection water and formation water. On thebasis of logging data and core analysis, formation water salinity and SP, RT, AC logging data, the water-flooded oil layer canbe identified and the mixed formation water resistivity can be obtained. The logging interpretation model is finally built up forthe water-flooded layer and matches well with the actual production data.

关 键 词：岩电实验 特低渗透 水淹层识别 解释模型 符合率 

分 类 号：TE348[石油与天然气工程—油气田开发工程] P631.81[天文地球—地质矿产勘探]