关键词: 四川省, 二叠系, 三叠系, 碳酸盐岩, 断裂带, 裂缝性油气藏

Abstract: The Permian and Triassic carbonate rock in south-west Sichuan region is one of themain producing area for natural gas,the reservoir space is mainly of pores,and fractures areof the passage,and the interconnection is poor.It is proven by actual drilling that there existanumber of subsurface faults and gas obtained along the faulted zone,but it is not certainwhether adjacent gas wells to be mutually interconnected or not making a selfrespective gaspool in many cases.The author has conducted a detailed study for wells in drilling throughfauIts in these two systems(P,T) in this region before 1991.Based on different stratigraphicalhorizons of dislocation and differnt contacts of lithologies,there may be nine different typesof faults for both Permian and Triassic,and it is proved that only the fault which cut off thePermian Maokou formation is better worthy of exploration for fractured gas pools in a fault-ed zone,the success ratio rnay be above 47%,the other fault types are all undesirable.

Key words: Sichuan province, Permian, Triassic, carbonate rock, faulted belt, fractured hydrocarbon reservoir