Detailed classification and evaluation of reserves in fracture-cavity units for carbonate fracture-cavity reservoirs

The previous classification and evaluation results of proven reserves of carbonate fracture-cavity reservoirs cannot meet the needs of detailed reservoir development and oil recovery improvement. Based on the identification of fracture and cavity, using both static and dynamic methods, we proposed a method for the detailed classification and evaluation of reserves in fracture-cavity units in view of the conditions of reserve effective controlling and producing. The reserves of fracture-cavity units were classified into uncontrolled, well controlled but unconnected, connected but difficult-to-produce, and connected and easy-to-produce reserves. The results were applied to a comprehensive strategy such as completed well deployment, injection-production adjustment and flow channel adjustment, which effectively improved production efficiency and development effect.