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随着油气田开发的不断深入，人们对搞清储层非均质性空间分布规律的要求越来越高。进行露头岩性体等级界面和构成单元的划分是解决这一问题的重要途径。国外学者Ａ．Ｄ．Ｍｉａｌ（１９８８）在此领域已先行一步，他将河流露头砂岩储层的非均质性按６级界面进行划分，同时在河流砂体内部划分出８种基本的构成单元。国内学者于兴河等人（１９９６）在建立陆相三角洲砂岩储层的地质模型时，同样也划分出６级界面，但构成单元增加到１０种。由于碎屑岩等级界面和构成单元的划分是储层建模和储层预测的关键，因此也是许多油气田提高采收率的关键。
With the continuous development of oil and gas fields, there is a growing demand for clarifying the spatial distribution of reservoir heterogeneity. It is an important way to solve this problem that the level interface of outcrop lithologic body and the division of constituent units should be carried out. Foreign scholar D. Mial (1988) has taken the first step in this area by dividing the heterogeneity of the outcropped sandstone reservoirs into six-level interfaces and delimiting eight basic units within the river sand body. When the domestic scholar Yu Xinghe et al. (1996) established the geological model of the terrestrial deltaic sandstone reservoir, the 6-level interface was also divided, but the number of constituent units increased to 10. The key to enhanced oil recovery in many fields is the fact that the clastic grade interface and the division of constituent units are key to reservoir modeling and reservoir prediction.