Computer Judgement for Sedimentary Facies Analyses of the First and Second Member,Jialing Jiang Formation,Low Triassic, East Sichuan

Usually,sedimentary facies is denominated by determining the nature. There are different facies analysis results to the same beds by different researchers. In the study area,the main types of sedimentary facies have been denominated. Through field fades analysising, four important facies factors have been introduced in this paper. The logic judge method is on the basis of expert system' s thought. The basic principal is utilizing sedimentary facies expert' s knowlege and analysising progress on Tc¹一Tc² of East Sichuan. Four factors, including lithology,tectonic, structure and fossil are given to computer, the computer can judge the type of facies through the judging sequence. The fuzzy comprehensive judgement method is on the basis of fuzzy mathematics. The factor set theory has been built when the computer gets the facies expert's experience and judging knowlege. Then,different weight factor must be given to four main factors.In order to build fuzzy set theory,the computer will judge the facies through comparing four given factors in judging matrix. The different judging method can be used through main menu, then answer the computer's question,imput different facies sign.at last, computer can glve the most possible facies and explains. Comparing cores analyses. the result of computer explain is close to the nature. The sedimentary facies work will be developed from determining the nature to the amount. The computer will play a more and more important role in sedimentary facies analysis.