Abstract: In view of the lack of systematic understanding of reservoir and accumulation control of faults in the Ordovician hydrocarbon-rich triangle zone in Tabei-Tazhong Uplift, a systematic study was conducted on the distribution characteristics of the strike-slip faults and reservoirs in the Tabei-Tazhong Area through detailed seismic interpretation and tectonic mechanic mechanism analysis, especially the development characteristics and hydrocarbon enrichment mechanism of hydrocarbon-rich triangle zone were analyzed through the mechanical mechanism of fault formation, fault scale, fault segmentation and fault combination style, et al. It was found in the study that the hydrocarbons in Tabei-Tazhong Area were controlled by two regional strike-slip faults, there were obvious differences in fault levels in the hydrocarbon-rich triangle zone formed by the two faults, and there were obvious segmentation characteristics; the fault zone in Tazhong Area was generally divided into linear, diagonal and feather segments, while the fault zone in Tabei Area could be divided into braided-grabon, tensilesegment and pinnate feather segments; the fault segmentation resulted in significant differences in hydrocarbon enrichment characteristics in different segments of the same fault, and different development methods could be used for different segments to improve the overall productivity of reserves. The study can provide valuable reference for the exploration of carbonate reservoirs with similar geological conditions at home and abroad.

Key words: Ordovician, carbonate rock, reservoir control factors, fracture system, hydrocarbon migration, Tabei-Tazhong Uplift