贝叶斯推论在储层渗透率预测中的应用

来源期刊:中南大学学报(自然科学版)2015年第3期

论文作者:喻鹏 唐仲华

文章页码:970 - 983

关键词:聚类分析;流动单元;流动层带指标;测井频率交会;渗透率预测;贝叶斯推论

Key words:cluster analysis; hydraulic unit; flow zone index (FZI); logging frequency of intersection; permeability prediction; Bayesian theory

摘    要:以辽河油田静安堡构造带静观2块油藏为例,应用贝叶斯推论预测流动单元分布,建立基于流动单元指数分类的渗透率模型同时验证预测结果的合理性。在预测过程中,运用均分、累积概率及指数函数单增法等划分方法对测井曲线进行分类并构建二维频率交会区间,计算流动单元在各区间上的后验概率进而判别非取心井测井段的流动单元类别,对比不同条件下的预测效果并优选最佳方法,进而预测储层渗透率,最后将预测模型平面及垂向特征和油藏实际进行验证对比。实际应用表明,地质、测井知识和贝叶斯推论方法相结合,能有效判别储层流动单元类别并预测渗透率,通过对比优选不同交会条件下的预测结果,提高渗透率的预测精度,为油藏描述和表征提供更准确的地质信息。

Abstract: The Bayesian theory was applied to predict the distribution of hydraulic units in the Jingguan2 Block of Jinganbao oil-bearing structure belt, the permeability model was built based on the flow zone index, and the rationality of predictions was validated. The bin average, cumulative probability and exponential monotonous increase methods were applied on logs to constructure the intersection bin of 2-dimensional frequency in calculating process, and the hydraulic units of uncored wells were predicted based on the posterior probabilities of intersection bins. The best method was selected under different conditions and the permeability was predicted, and the horizontal and vertical distribution of model was validated for real reservoir conditions. The practical application shows that combining Bayesian theory with geology and well logging can not only effectively predict the hydraulic unit and permeability of reservoir, but also increase the accuracy by choosing the outstanding prediction result under different conditions, which provides more accurate geological information for reservoir description and characterization.

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