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碳酸盐岩的物源性质、形成背景、沉积机理和扩散方式都与碎屑岩有很大的差异．对于碳酸盐岩层序地层，需要从成因上、从台地的性质与演化、海不的进退、台地的淹没与暴露等方面进行研究．在总结露头层序地层工作方法的基础上，阐述了密集段、首次洪泛面和层序边界的识别标志，建立了高分辨率层序地层格架．鄂尔多斯盆地早奥陶世三道坎组沉积时，为碳酸盐岩－碎屑岩混合缓坡背景；桌子山组及克里摩里组沉积时为镶边陆架与末端陡倾缓坡的背景；乌拉力克组及中奥陶世时，转化为拗拉槽背景．由此分别建立了碳酸盐岩－碎屑岩缓坡模式和镶边陆架与末端陡倾缓坡的综合模式
The source rocks of carbonate rocks, the background of their formation, the sedimentary mechanism and the way of diffusion all have great differences with clastic rocks. For carbonate sequence stratigraphy, it is necessary to study from the aspects of genesis, nature and evolution of the platform, advance and retreat of the sea, submergence and exposure of the platform. On the basis of summarizing the working methods of outcrop sequence stratigraphy, the identification symbols of dense section, first flood surface and sequence boundaries are expounded and a high-resolution sequence stratigraphic framework is established. In the Ordovician basin, Sandaoan Formation deposited during the Early Ordovician was a carbonate-clastic mixed gentle-slope background; the Cretaceous and Creimoli formations were the background of the continental shelf and the steep gentle slope at the end of the deposition; During the Middle Ordovician, it was transformed into aulacogen background. Thus, a comprehensive model of carbonate rock-clastic rock gentle slope model and steep shelf and steep gentle slope at the end