利用多种手段进行地层综合划分与对比——以准噶尔盆地春风油田主力稠油层层位归属为例

Stratigraphic division and correlation using various approaches-case of stratigraphic correlation of heavy oil,Chunfeng oilfield,Junggar Basin

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。

The stratigraphic correlation of major reservoir of Chunfeng oilfield in Junggar Basin,classified into the Cretaceous or the Neogene Shawan formation,is still in debate.Based on the stratum mark,sequence stratigraphic analysis,and logging correlation, the new stratigraphic correlation is implemented combined with stratum structure analysis,forward model and drilling data. It is shown that,the major heavy oil layer belongs to the Neogene,Shawan formation,and a stratigraphic-stratum reservoir formed by channel sand of delta front and braided river,and shallow lacustrine bar sand.And,it is overlied on the unconformity surface between Mesozoic cretaceous and Neogene.It resolves the major reservoir classification problem of Chunfeng oilfield,and establishes the favorable geological base for the rolling exploration and development plan.