The Pingnan buried hill hydrocarbon reservoir is a combination of new source rock and old reservoir, dominated by Ordovician and Cambrian carbonate rocks. Fractures constitute the main accommodation space for petroleum in the reservoir, and the key to the exploration of the buried hill hydrocarbon reservoir is to find fractures in rocks. According to geometrical properties of the fractures, this paper puts forward a method for forecasting and describing the fracture system in the reservoir based on multiple geometrical properties. This method can describe the distribution of fractures quantitatively, and the test results have been proved by the drilling data.