Carbonate Rock Facies Model of the Upper Third Member of Shahejie Formation of Paleogene in the Central Uplift Belt of Raoyang Depression, Hebei Pronince

Key words: 
• sedimentary characteristics

Abstract: Carbonate rock facies model of the upper third member of Shahejie Formation of central uplift belt in Dawangzhuang oilfield of Raoyang depression were studied by core observation, granularity analysis and well log analysis. It can be seen that the aim stratum in the study area develop carbonate rock shoal, and the type of carbonate rock consist of algalsandclastic dolomite, oolitic dolomite , micritic dolomite , clasticbearing sand clasticoolitic dolomite. Carbonate shoal develop four microfacies: algal shoal , oolitic shoal, micritic carbonate bend and terrestrial grain shoal. The alternation of lake level, ancient landform, the strength of tectonic action and the provision of terrestrial material affect the carbonate shoal, and the change of micromilieu in the central uplift belt palaeogeomorphology directly affect the rock type and sedimentary microfacies, high terrain develop algal shoal and oolitic shoal, micritic carbonate bend appear in low terrain with low energy. Algal shoal and oolitic shoal is the best reservoir in the studied area, sedimentary microfacies analysis and facies model establishment can help Dawangzhuang oilfield's reservoir forecast, and can be a useful geologic model for reservoir forecast in other similar areas.