Fractured-vuggy carbonate reservoirs have various types of units, and it is important making a full use of the well test data for revealing the reservoir characteristics and enhancing the oil production. In the conventional analytical well test model, the positional relationship of the well and the fractured-vuggy units can not be properly considered. According to the distribution of the well and the fractured-vuggy units, two kinds of discrete numerical models are proposed, and solved by the finite element method. The influence of the cave volume and the distance between the cave center and the well is analyzed. The measured data of 14 wells in Hala Hatang Oilfield are classified and summarized, and the classification of the reservoir units and the identification methods are analyzed. The well test double logarithmic curves are divided into five types corresponding to different reservoir characteristics:the cave development, no drilling cave, the well near the cave; the cave development, the drilling cave; a number of connected caves of the reservoir; matrix dominant, fracture is not developed; caves are not developed, drilling individual caves.

carbonate reservoir  /  fractured-vuggy caves  /  well test model  /  transient pressure curves