Abstract: Taking Ha-6 well block as an example, based on the study of reservoir distribution and spatial relationship of oil and water in the study area, this paper analyzes the development features of producing wells, establishes 3 patterns of oil and water distribution in cave-cleft bodies which can be identified from single wells—separate oil and bottom/edge water connection pattern, separate water and bottom/edge water connection pattern and composite fracture connection pattern, and demonstrates the causes of the 3 patterns and the production characteristics. The paper also presents 3 performance analysis methods to identify cave-cleft bodies, i.e. production test data analysis method, waterflooding type curve analysis method and elastic productivity analysis method, and demonstrates the correspongding identification methods applicable for each cave-cleft body. Combined with the principle of planar distribution area determination for cave-cleft bodies, 3 types of cave-cleft bodies are identified in the study area.