CAJ | 학술논문

针对大庆低渗透油田开发效果变差、开发储量品位降低、优选区块技术难度增大，导致原有的评价方法、优选技术、开采方式难以满足低渗透油田发展需要的问题，提出了应用聚类分析的方法对低渗透油田储层进行分类。首先简述聚类分析以及马氏距离的基本原理，并根据油田不同储层参数对储层采出贡献程度不同的特点，以及原有马氏距离在估计协方差矩阵方面难度大导致计算效率低的问题，提出了马氏距离聚类过程中估计协方差矩阵的迭代法。该方法充分考虑到了变量权重和样本类别的影响，对协方差矩阵的估计进行改进，能够在一定程度上减少权值确定上的主观因素并提高计算效率。以油田开发实际数据为例进行实验分类，结果表明该方法是有效可行的。
침대대경저삼투유전개발효과변차、개발저량품위강저、우선구괴기술난도증대，도치원유적평개방법、우선기술、개채방식난이만족저삼투유전발전수요적문제，제출료응용취류분석적방법대저삼투유전저층진행분류。수선간술취류분석이급마씨거리적기본원리，병근거유전불동저층삼수대저층채출공헌정도불동적특점，이급원유마씨거리재고계협방차구진방면난도대도치계산효솔저적문제，제출료마씨거리취류과정중고계협방차구진적질대법。해방법충분고필도료변량권중화양본유별적영향，대협방차구진적고계진행개진，능구재일정정도상감소권치학정상적주관인소병제고계산효솔。이유전개발실제수거위례진행실험분류，결과표명해방법시유효가행적。
Aiming at the problem that original evaluation method,optimal technology and exploring way can’ t meet the development need in Daqing oilfield with low permeability,which caused by worse development effect,lower development grade,and the technology of pre-fer block is more hard,propose that applying the clustering analysis to classify the oil reservoir with low permeability. First,describe the basic principle of cluster analysis and Mahalanobis distance briefly,according to the characteristics that the oil of different reservoir param-eters have different degree of contribution on reservoir recovery and the problem of the original Mahalanobis distance has low calculation efficiency in evaluating covariance matrix,present an iteration method to estimate the covariance matrix of Mahalanobis distance during the cluster analysis. The weights of variables and categories of samples are taken into account,estimation of the covariance matrix is im-proved,the method can reduce the subjective factors on determining weights and improve the computational efficiency in a certain extent. With actual oilfield development data as an example for classification,the experimental results demonstrate the effectiveness of the meth-od.