Hydrocarbon accumulation conditions of carbonate buried-hill are favorable in Nanpu Sag,and hydrocarbon enrichment is controlled by multiple factors like stratigraphy,structure and reservoir. Development and distribution of quality reservoir are the focus of the research. In-depth analysis of drilling,logging,core and other data reveals that the main reservoir type is fractured-vuggy carbonate reservoirs in Nanpu Sag,with dissolution pores and vugs as the dominant reservoir space and fractures as the main c...