萨北二西区葡Ⅰ油组沉积特征研究

Research on sedimentary characteristics of PuⅠ oil group in WestⅡ Region of Sabei Oilfield

为了有效促进萨北二西区葡Ⅰ油组的滚动勘探开发,开展了油区沉积相精细研究。利用地质、测井、录井、岩心等资料,基于不同的级别层序界面和湖泛面,识别出了姚家组3种类型的岩心界面:相组合的转换界面、岩石相内部显示不同的层理变化的界面以及表示砂泥岩厚度旋回性变化的界面,并进行了精细地层对比。在岩心描述基础上,进行单井沉积相、连井沉积相、平面沉积相分析。认为研究区为河控三角洲相,并系统划分了沉积微相类型,同时确定了不同微相的测井响应,最后对各沉积相展布特征和演化规律进行了探讨。

In order to promote the rolling exploration and development of the PuⅠoil group in the eastern part in WestⅡ Region of Sabei Oilfield,a fine study of the sedimentary facies of the oil-bearing area was carried out. Guided by the geological,logging,mud logging,and core data,three core interfaces can be identified in the Yaojia Formation based on the identification of different sequence interfaces and lake flooding： lithofacies type or combination of the conversion surface,the rock layer within the layer of change in the interface and sand,mudstone thickness cyclic interface,and the fine stratigraphic correlation was carried out. On the basis of core description,single well sedimentary facies,continuous well sedimentary facies and planar sedimentary facies were analyzed. It is considered that the study area is river-controlled delta facies,and the sedimentary microfacies types are systematically divided,and logging of different microfacies was determined. Finally,the characteristics of sedimentary facies distribution and evolution were discussed.