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对于准噶尔盆地春风油田主力稠油层层位归属为新近系沙湾组还是白垩系争议较大。在层位标定法、层序地层分析法和测井资料对比法等常规地层划分与对比的基础上,利用地层结构分析法、正演模型法和钻井验证法等多种手段,进行了地层综合划分与对比的新尝试。结果表明:春风油田目前发现的主力稠油层层位应为新近系沙湾组,属于辫状河三角洲前缘分支河道砂体、湖岸砂坝等沉积砂体形成的地层-岩性油藏,其发育在中生界白垩系与新生界新近系不整合面之上。春风油田主力稠油层层位划分争议这一疑难问题的解决,为滚动勘探和开发方案部署奠定了良好的地质基础。
It is controversial that the main heavy oil layers of Chunfeng Oilfield in Junggar Basin belong to the Neogene Shashi Formation or Cretaceous. Based on the stratigraphic division and comparison between stratigraphic calibration, sequence stratigraphy and well logging data, and other methods, stratigraphic structure analysis, forward modeling and drilling validation are applied to stratigraphic synthesis New attempt to divide and contrast. The results show that the main thick oil layer in Chunfeng Oilfield should be the Neogene Shawan Formation, a stratigraphic-lithologic reservoir formed by sedimentary sand bodies such as braided river delta front channel sand body and lake bank sand bar, Development in Mesozoic Cretaceous and Cenozoic Neogene unconformity above. The solution to this difficult issue of the controversial division of the main heavy oil layers in Chunfeng Oilfield has laid a good geological foundation for the deployment of rolling exploration and development programs.