Carbonate reservoir controls in the Shiranish Formation of O oil field, Syria

The reservoir characteristics and controlling factors of the Cretaceous Shiranish Formation in O oil field in Syria were studied using petrophysical logs, core samples, thin sections, physical properties and mercury penetration data. Two types of reservoir rocks were identified:limestone reservoir developed in bioclastic shoal microfacies and silt-sized crystalline dolomite. They are different in depositional environment, reservoir type, storage space, physical properties and pore structure. Limestone reservoirs with selective texture pores have good pore structure and physical properties controlled by sedimentary facies and multi-phase dissolution. Silt-sized crystalline dolomite with both selective and non-selective pore textures is of medium-high porosity and high permeability controlled by large fault systems and dolomitization.