吴起油田贺阳山地区长6油层组沉积微相及储层评价研究

Study on Sedimentary Microfacies and Reservoir Classificiation of Chang 6 Formation in Heyangshan Area of Wuqi Oilfield

沉积作用控制着储层的物性与连通性,是影响储层发育与分布情况的重要因素,因此对储层进行分类评价要着重考虑储层所在沉积相带。通过测井资料以及扫描电镜、岩心铸体薄片、高压压汞实验等数据对贺阳山油区长6油层组的沉积微相进行刻画并且对储层进行分析和评价。结果表明:贺阳山油区长6油层组为三角洲前缘亚相,并且储层非均质性较强,依据沉积相带以及储层物性,可将研究区储层类型可分为三类,从长61-长64来看,优质储层的分布随沉积相变化紧密贴合,随着地层变新,优质储层分布逐渐变少。

Sedimentation controls the physical properties and connectivity of the reservoir and is an important factor affecting the development and distribution of the reservoir.Therefore,the classification of the reservoir should focus on the sedimentary microfacies belt where the reservoir is located.The characteristics of Chang 6 reservoir and sedimentary microfacies in Heyangshan Oilfield are analyzed and evaluated by logging data,scanning electron microscope,core casting thin section,high pressure mercury injection experiment and other data.The results show that the Chang 6 oil layer group in Heyangshan oil field is a delta front subfacies,and the reservoir heterogeneity is strong,according to the sedimentary facies and Reservoir physical properties can be divided into three types of reservoirs in the study area.From Chang 6_(1) to Chang 6_(4),the distribution of high-quality reservoirs closely fits with changes in sedimentary microfacies,and the distribution of high-quality reservoirs gradually decreases as the formation becomes newer.