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

摘要： 川西南地区二、三叠系碳酸盐岩是该区天然气的主要产层之一,储集空间以孔洞为主,裂缝为通道,连通性较差.实钻证实,并下存在有较多断层,沿断带常常获气,但其与相邻气井则不一定彼此相互连通,而自成一气藏.对该区1991年前在该两系钻遇断层的井进行了研究,按断错不同层位、不同岩性接触,二、三叠系俱可分为九种不同类型的晰层,研究证明只有将二叠系茅口组断开的断层才对断带裂缝气藏具有较好的勘探价值,成功率可达47%以上,其余类型断层均不理想.

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