Verification of Fuzzy Pattern Recognition of CBM Target Selection
摘要
This chapter verifies the rationality and reliability of the fuzzy pattern recognition model through empirical analysis of two typical blocks. For the No. 3 coal seam in the Fanzhuang Block, southern Qinshui Basin, the study area is divided into 4 evaluation units. Calculations are conducted based on the high-rank coal evaluation parameter system, and the results indicate that Evaluation Unit 2 is a Class I target area with excellent potential, while the others are Class II target areas with moderate potential. This outcome is consistent with the actual development performance where 33% of the wells yield over 2000 m3 of gas per day, and it outperforms the evaluation results derived from the subjective weighting method of traditional approaches. In the A2 coal seam in the western Fukang Mining Area, southern Junggar Basin, the study area is divided into 6 evaluation units. Calculations are performed in accordance with the low-rank coal evaluation criteria, revealing that Evaluation Units 3 and 5 are Class I target areas. Notably, the peak daily gas production of the pilot test well in Evaluation Unit 5 reached 35,794 m3, achieving commercial development. Both verification cases demonstrate that the evaluation results of the fuzzy pattern recognition model are highly consistent with the actual development outcomes, addressing the uncertainty issues inherent in traditional methods.