鄂尔多斯盆地华庆地区长8油层沉积微相类型及其主要特征研究

Sedimentary Microfacies Types and Characteristics of Chang 8 Reservoir in Huaqing Area of Ordos Basin

在岩心观察、测井资料及前人研究成果的基础上,通过对大量物性资料、测井资料统计分析,确定了鄂尔多斯盆地华庆地区长8油层的沉积类型(主要为辫状河三角洲沉积体系的三角洲前缘沉积),识别出了水下分流河道、河口坝、水下天然堤和水下分流间湾4种微相类型,分析了各种沉积微相的特征,预测了各种沉积微相在平面上的展布规律。研究表明,水下分流河道微相是长8储层的主要沉积微相,也是最有利的储集砂体。

Based on core observation,logging data and the studied results,and through statistical analysis of petrophysical data and logging data,the sedimentary facies was determined to be the front-delta deposition of braided river delta deposits according to the previous research results,and four microfacies types were recognized including subaqueous distributary channel,mouth-bar,subaqueous natural barrier,subaqueous interdistributary embayment.Characteristics of all kinds of the sedimentary facies were analysed,the lateral distribution of the sedimental facies is predicted.Subaqueous distributary channel is the primarily microfacie of the Chang 8 reservoir and the most beneficial reservoir.