Log-based evaluation of intralayer heterogeneity of glutenite reservoirs in the Niudong area
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摘要: 牛东地区砂砾岩储层具有低孔、低渗等特征, 储层结构复杂, 非均质性较强, 常规测井对储层类型划分困难, 影响了储层评价精度。岩心孔渗、薄片分析、X衍射等测试资料表明, 牛东地区砂砾岩储层具有较强的非均质性, 且根据毛管压力形态可将储层分为3个类别。本次研究利用电成像测井资料对储层层内非均质性进行评价:首先对电成像测井资料进行处理得到储层孔隙度谱, 再对随深度变化的孔隙度谱进行研究, 分别计算不同深度上孔隙度谱的均值、方差、洛伦兹系数和集中程度函数; 根据综合概率模型, 利用层次分析法确定评价指标的权重, 得到储层非均质性综合指数, 据此对储层进行划分, 并建立储层非均质性的评价标准。应用该方法得到的研究结果与压汞实验结果一致, 说明利用该方法能够有效地评价储层非均质性, 可丰富现有的储层非均质性评价方法, 为储层的精细评价提供一定的理论支撑。Abstract: Glutenite reservoirs in the Niudong area exhibit low porosity and permeability, intricate reservoir structures, and pronounced heterogeneity, making it difficult to classify the reservoirs using conventional logs and further impairing reservoir evaluation accuracy. As indicated by the data from core porosity and permeability tests, thin-section analysis, and X-ray diffraction tests, the glutenite reservoirs in the Niudong area feature high heterogeneity and can be classified into three types based on capillary pressure morphologies. This study evaluated the intralayer heterogeneity of the reservoirs using electrical imaging logs. First, reservoir porosity spectra were derived from the electrical imaging logs. Then, the averages, variances, Lorenz coefficients, and concentration functions of the porosity spectra of different depths were calculated by analyzing these depth-varying porosity spectra. Based on the integrated probability model, the weights of evaluation indices were determined through hierarchical analysis, obtaining the composite index of reservoir heterogeneity. Accordingly, the reservoirs were classified, and the evaluation criteria for reservoir heterogeneity were established. The results of this study were consistent with the results of mercury injection experiments. The method used in this study proves effective in reservoir heterogeneity evaluation, enriching current methods for reservoir heterogeneity evaluation and providing theoretical support for fine-scale reservoir evaluation.
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