Fractures are a key factor in the formation of tight oil and gas reservoirs. The identification and description of fault bodies are of great significance for the exploration and development of tight- low permeability oil reservoirs. As the southern margin of the Ordos Basin has complex reservoir conditions and diverse enclosure type, the identification of fault bodies and fractures are the key to opening the oil reservoirs. However, due to the complex coexistence relationship between faults and fractures, the identification and description of fault bodies have long relied on the manual judgment and interpretation of geological experts. The geological interpretation results and knowledge lack effective organization and management, to some extent limiting the application level of geological knowledge of fault bodies. This study aims to constructing a framework for a geological object- oriented knowledge database of the fault—fracture body reservoirs.Methods: This study focuses on the geological outcrops of fault—fracture body reservoirs. Focusing on the geological outcrop in the southern area of the Ordos Basin, this study characterizes the fracture units on the outcrop profiles, divides the outcrop into different fracture zones according to the geological laws of fault structures. By combining with the results of stratigraphic division, different fracture segments are identified. An outcrop geological knowledge base is designed and developed to organize and manage the fault—fracture body reservoirs.Based on structured organization of geological interpretation results of fault—fractured outcrops, data mining methods are involved to explore quantitative parameters for geological modeling. Results: This study proposes a multi- level structure of “body—zone—segment—fracture” elements on fault—fracture outcrops, which realizes the standardized description and structured management of fault—fracture geological bodies and their related constituent elements. This study implements a novel knowledge database system for geological outcrop interpretation. It achieves interactive statistical analysis and mapping of fracture parameters and outputs quantitative analysis reports on outcrop data of fault—fracture body reservoirs.Conclusions: The application results show that the designed system can effectively realize the structured management and visual analysis of fault—fractured outcrops. It is expected to provide decision support for reservoir modeling and oil exploration.