Abstract: In order to realize an computerired automatic electrofacies analysis for determining the lithology of beds penetrated by a well, a combination of in-zone variance method with cluster aralysis technique is used for determining the zone boundaries by well logging curves. The types of electrofacies of standard sample beds from key well are classified by a combination of principal component and cluster analysis. The discriminant models of each electrofacies are established by Bayes'step-by-step discriminant analysis. An electrofacies-lithology model of oil field is established by detailed correlation of electrofacies with core data. Finally a continualy bed-by-bed electrofacies analysis is carried out for key well and most wells without coring. Consequently a continuoasly and complete lithologic profile can be obtained. The electrofacies analysis software based on the above mentioned methods has been developed. The well logging data of several wells located in Shen Li, Da Gang and Hua Bei oil fields have been processed by this software. The results are coinsided to be very well with the data of cores and drilling cuttings. It has been demonstrafed that the suggested methods are sucessful, the software are applicable, and the results of automatic electrofacies determination are satisfactory.

摘要： 为了实现用计算机进行测井相分析,确定整个钻井剖面地层的岩性,本文采用层内差异法与聚类分析结合的方法进行测井曲线自动分层;用主成分分析与聚类分析结合的方法划分关键井中标准样本层的测井相类型;根据Bayes逐步判别分析法建立各类测井相的判别模型;通过同岩心资料的详细对比,建立一个油田的测井相—岩性数据库;最后根据所建立的判别模型与数据库,用判别分析法对关键井及绝大多数未取心井进行连续逐层的测井相分析及岩性鉴别,从而得出这些井连续而完整的岩性柱状剖面图。用这些方法研制的测井相分析软件AEFS,先后处理了胜利、任丘、大港、四川、江汉等油田十多口井的测井资料,其结果与岩心、岩屑录井等地质资料相当吻合。