AS油田WY区特低渗透油藏水淹层评价方法

发布时间：2018-05-19 05:00

本文选题：岩电实验 + 特低渗透　；参考：《西南石油大学学报(自然科学版)》2016年06期

【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。
[Abstract]:The original formation water mineralization of the ultra-low permeability reservoir in WY area of as oilfield is very high. The resistivity of the reservoir is asymmetric U-shaped due to the long-term development of fresh water injection, and the resistivity of the strong water-flooded reservoir is even higher than that of the original reservoir. Due to the complexity of the influencing factors and the influence of the reservoir characteristics, the logging method for evaluating residual oil in high permeability reservoirs is not suitable for the evaluation of ultra-low permeability water flooded reservoirs. On the basis of rock electricity experiment, the mechanism of freshwater flooding in ultra-low permeability reservoirs is determined. That is, when the resistivity of injected fresh water is larger than that of formation water, and when the ratio is large enough, the resistivity of water-flooded layer is obviously higher than that of the original oil layer, that is, the phenomenon of U-shaped curve appears. Based on the conventional logging curves and core analysis data, the qualitative identification of water-flooded zones is carried out through the combination of the log curves of formation water salinity and natural potential amplitude, resistivity and sonic time difference, and the method of calculating the resistivity of formation mixed fluid is discussed. A quantitative interpretation model of fresh water flooding zone is established. The coincidence rate between the interpretation result and the test production is more than 85%.
【作者单位】：中国石油勘探开发研究院;
【分类号】：TE348

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