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储层层内非均质性是进行储层描述和油藏评价的重要内容,针对当前储层非均质性定量化描述的种种问题,依据鄂尔多斯盆地子长油田中庄区Z225井密闭取心资料,根据洛伦兹曲线法原则,将实测渗透率进行降序排列,计算出渗透率贡献百分数以及与其对应的序数百分数,获得渗透率累积分布特征。通过倒数变换,将不同形态的累积曲线转换为直线,其斜率介于0～1之间,实现了统一标准下的非均质性定量化表征。结果表明,研究区Z225井取心段3个单砂层非均值程度系数均小于0.5,因此其均具有较强的层内非均质性。
In-reservoir heterogeneity is an important part of reservoir description and reservoir evaluation. According to the problems of current reservoir heterogeneity quantification description, according to the closed coring data of Z225 well in Zhongzhuang District, Zichang Oilfield, Ordos Basin According to the principle of Lorentz curve method, the observed permeabilities are arranged in descending order, and the percentage of permeability contribution and the corresponding ordinal percentage are calculated to obtain the cumulative distribution of permeability. By means of reciprocal transformation, the cumulative curves of different forms are converted into straight lines with slopes ranging from 0 to 1, which achieves the quantitative characterization of heterogeneity under the unified standard. The results show that the non-mean degree coefficients of three single sand layers in the coring section of well Z225 in the study area are all less than 0.5, so they all have strong intra-layer heterogeneity.