Basic Characteristics and Concentration of the Puguang Gas Field in the Sichuan Basin

The Puguang Field is the biggest and deepest gas field recently found in the Sichuan Basin of southern China with a proved gas reserve of 1144×108 m3 of the Feixianguan Formation reported to the National Mining Reserves Committee. Reserves of the three degree proved is 3500×108 m3. The reservoir rock of the Lower Triassic Feixianguan Formation is pure dolomite with oolitic dolomite and remnant oolitic dolomite. The reservoir has a high quality with medium to high porosity and permeability. The porosity may be related to the dissolution of deep thermal water. Closeness to the main hydrocarbon-producing sag, high-quality reservoir rock and timely uplifting are the favorable geological conditions to form this gas field.