Abstract: The origin of calcareo us interbeds in Xishany ao For mation of the Jurassic in Shinan area of Junggar Basin was studied. The observation and study on cores and quant itative information about logging data abundantly show the occurrence of litho logy and logging configuration of calcareous interbeds in the delta front reservoir of the Shinan area. The laws of spatial distribution of calcareous interbeds formed by carbonate cementation were discussed. The calcareous inter beds distribute on the top of debouchbar and the bottom of branched underw ater channel in the front of delta, which becomes the symbol of subdiv ision and iso chronous cont rast of bed sets. At the same time, it is po inted that the calcareous intebeds may become the symbol of high-resolution sequence stratig raphic isochronous contrast. The stratig raphic construction model was developed and high-resolution chrostratig raphic framework was given.

Key words: Junggar Basin, Jurassic, Xishanyao Formation, calcareo us interbeds, sedimentary microfacies, stratig raphic construction model, diagenesis, sequence stratig raphy

摘要： 以准噶尔盆地腹部石南井区为例,探讨了侏罗系西山窑组三角洲前缘亚相油气储层中钙质夹层的成因机制,揭示了其空间分布规律。研究结果表明,钙质夹层主要分布在三角洲前缘水下分支河道的底部和河口坝的顶部,可以作为高分辨率等时地层对比的标志。对石南井区含油层段进行了高分辨率层序地层学分析,建立了该区层组(六级层序)级别的地层叠置模式及高分辨率等时地层格架。

关键词: 准噶尔盆地, 侏罗系, 西山窑组, 钙质夹层, 沉积微相, 地层叠置模式, 成岩作用, 层序地层学