Study on Oil-Water Saturation Correction from Sealed Core Wells
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摘要: 密闭取心井的油水饱和度分析资料是评价储层含油性的重要数据, 而室内岩心分析测量的油水饱和度常常偏离原始地层条件下的真实情况, 需要校正后才能使用.以克拉玛依油田一中区克下组油藏为例, 首先基于油水饱和度的理论模型, 依据油水剩余率的概念分析了原始地层条件下油水饱和度与实验室测量的油水饱和度之间的联系, 进而确定了岩心分析的油水饱和度与油水剩余率的线性关系, 基于该线性关系的斜率和截距, 利用数理统计和数学处理的方法建立了油水饱和度损失总量中油、水各自的损失百分比, 最终依据损失百分比可以有效地对饱和度资料进行校正.此方法在克下组油藏的实际应用中取得了很好的效果, 校正后的饱和度资料使岩心含油性与储层电性之间的相关性得到了很大的提高, 校正数据可以更好地反映原始地层的含油情况, 为饱和度公式的确定以及剩余油的评价提供准确的基础数据.Abstract: The analysis of oil-water saturation from sealed core wells is important data for evaluation of oil-bearing property of reservoirs. However, the oil-water saturation values from core measuring in laboratory usually deviate from true situation of original formation condition, so these data must be corrected before using. In this paper, the Kexia Group reservoir of First-Middle block in Karamay oilfield is selected as the study object. Firstly, based on the theoretical mode of oil-water saturation the relationship between oil-water saturation under original formation condition and oil-water saturation of sealed core analysis are studied according to the concept of oil-water remaining rate, and then the linear relationship of oil-water saturation values of sealed core analysis and oil-water remaining rate are determined. Based on the slope and intercept of above linear relationship the oil and water loss percentage in total loss of oil-water saturation are respectively established by use of mathematical statistics and mathematical processing methods. Finally, the saturation data can be effectively corrected by oil and water loss percentage. The above-mentioned method is applied to oil-water saturation correction in Kexia Group reservoir and achieves good application results. The using of corrected saturation data greatly improves correlation between core oil-bearing and reservoir electricity and corrected data can better reflect the oil-bearing situation of original formation, then provides accurate basic data for the saturation formula determination and remaining oil evaluation.
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Key words:
- sealed core well /
- saturation correction /
- remaining rate /
- linear relationship /
- mathematical processing /
- geophysics
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图 1 一中区A井(a)和B井(b)油水饱和度交会
Fig. 1. Crossplot of oil-water saturation from well A (a) and well B (b) in the First-Middle block
图 2 实测油水饱和度与理论值对比
Fig. 2. Comparison of actual measuring oil-water saturation and theoretical values
图 3 物理模拟实验的饱和度校正流程
Fig. 3. Schematic of experimental equipment of saturation correction
图 4 T10193井岩心分析油水饱和度交会图
Fig. 4. Crossplot of oil and water saturation from core analysis in well T101093
图 5 T10193井饱和度校正结果与测井曲线对比
Fig. 5. Comparison of saturation correction results and well logs in well T10193
表 1 T10193井油水饱和度校正数据
Table 1. Data of oil-water saturation correction in well T10193
岩心序号 校正前的油饱和度S'o(%) 校正前的水饱和度S'w(%) 校正前油水饱和度和(%) 数理统计方法 物理模拟实验方法 校正后的油饱和度So(%) 校正后的水饱和度Sw(%) 校正后的油饱和度So(%) 校正后的水饱和度Sw(%) 1 54.8 33.9 88.7 63.58 36.42 59.27 40.73 2 51.5 38.6 90.1 59.19 40.81 54.54 45.46 3 47.5 34 81.5 61.87 38.13 59.17 40.83 4 30.2 65.6 95.8 33.46 66.54 27.38 72.62 5 51.6 36.9 88.5 60.54 39.46 56.25 43.75 6 49.8 39.1 88.9 58.42 41.58 54.04 45.96 7 44.5 42.9 87.4 54.29 45.71 50.22 49.78 8 58.5 27.2 85.7 69.61 30.39 66.01 33.99 9 44.7 42.4 87.1 54.72 45.28 50.72 49.28 10 43.2 45.8 89.0 51.75 48.25 47.30 52.70 11 50.7 38.5 89.2 59.09 40.91 54.64 45.36 12 54.6 25.5 80.1 70.06 29.94 67.72 32.28 13 34.7 49.4 84.1 47.05 52.95 43.68 56.32 14 51.9 35.4 87.3 61.77 38.23 57.76 42.24 15 50.4 39.5 89.9 58.25 41.75 53.64 46.36 
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