The deep marine strata in Puguang Area are the key targets for exploration in northeastern Sichuan. Six hydrocarbon-bearing blocks were discovered with good exploration prospects. such as Puguang and Dawan, With the successive failure of many prospecting wells, it is urgent to improve the re-recognition of characteristics and reservoir formation conditions of gas reservoirs in Puguang Area. Therefore, the types and main controlling factors of gas reservoirs in Puguang Area were analyzed according to logging data, seismic data, core description, analysis and testing data. The results showed that, there were three types of gas reservoirs in the study area: anticline, anticline-lithology, and fault-lithology. The development of gas reservoirs was mainly controlled by four factors. The source rock had high abundance of organic matters, high intensity of gas generation, and wide range of gas generation. In the sedimentary environment of rimmed platform, dolomite such as bioclast and oolite was developed in the reservoir. The dominate reservoir types were porous type, pore-fracture type and vuggy type, with sound physical properties (the average porosity was 8.20% and the average permeability was 79.50 mD). The lithology of the cap rock was mainly gypsum-salt rock, with an average thickness of more than 290 m and a wide distribution range. There were five large NE-trending faults and multiple NW-trending faults which constituted the main channel system for oil-gas migration in Puguang Area. On this basis, four types of favorable areas for accumulation were defined, with the most favorable zones located in Puguang, Maoba and Dawan blocks. The study can provide theoretical guidance and technical support for the further exploration and development of deep carbonate reservoirs in Puguang Area.
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