关键词: 碳酸盐岩, 成藏条件, 主控因素, 普光气田, 飞仙关组, 四川盆地

Abstract: Puguang Gas Field as the largest gas field of Sichuan Basin is also the biggest marine carbonate formational gas reservoir. In addition, Puguang Gas Field has highlights in several aspects such as the deepest burial condition, the highest reserves abundance, excellent reservoir quality, the thickest reservoir bed, the highest quantity of H₂S and the biggest dry coefficient of natural gas. Puguang Gas Field has the special condition of reservoir-forming, which is in virtue of some factors, including the repeated infusion of the multiple hydrocarbon and high quality of hydrocarbon, the dynamic matches of channel system and the processes of generation and expulsion of hydrocarbon, the development of reservoir bed at the edge of evaporated plateau and the high-energy oolite facies, the highly formation of the secondary porosity due to the late dolomization and intense acid corrosion, the paleo-tectonic bulges and long-term received hydrocarbon, the occurrence of thermochemical sulfate reduction and the highly development of secondary porosity in reservoir bed, the optimism of the performance of reservoir bed, as well as the effectiveness barrier of thick gypsum rock in Jialingjiang and Leikoupo formations overlying Feixianguan Formation.

Key words: carbonate rock, reservoir forming condition, main control factors, Puguang Gas Field, Feixianguan Formation, Sichuan Baisn