The fuzzy characters of log layering and log parameter distritution are difficult problems in log-sedimentary facies recognition of carbonatite section of Carboniferous Huanglong Formation in East Sichuan.Based on the introduced conception of subordinate function

the fuzzy recognition system of log-sedimentary facies of carbonatite section is deveolped according to the principle of fuzzy recognition and fuzzy expert dicision.The results of three wells’recognition of the sedimentary microfacies of Huanglong Formation show that the rate of correct recognition of the system is up to 85%

which brings it a bright application prospect.