Abstract:

Northeastern Sichuan Basin has fevourable geological condition to form gas pools in Permian and Triassic. A number of gas fields or gas-bearing structures have been discovered. This region is one of the important gas exploration area. This paper discribes how to use the gas resource assessment expert system and fuzzy set analysis method to appraise the gasbearing probability of 88 traps in Lower Permian, Upper Permian and Lower-Middle Triassic in the study area. The traps were analysed and divided into four levels of gas-bearing traps. Finally, exploration decision analysis system was adopted to analyse the 21 structures of Ⅰ and Ⅱ level traps, and tow exploration plans are put forward.