Multi-level fuzzy comprehensive evaluation model for favorable coalbed methane development area based on logging information: a case of Shouyang block

In order to overcome the problem that the evaluation parameters are difficult to be systematically and precisely measured, a multi-level fuzzy comprehensive evaluation model for favorable coalbed methane (CBM) development area which includes 2 second-level factors (resource condition and developmental condition), 8 third-level factors and 2 fourth-level factors is established based on logging information in this study. By utilizing this model, the evaluation parameters are fitted and then predicted by logging information and then CBM in NO.3, NO.9 and NO.15 coals with single-layer or commingling production is evaluated in Shouyang block. Research shows that CBM in NO.3 coal is more favorable, NO.9 less favorable and NO.15 moderate in single-layer production and CBM in NO.(3 and 15) coal is the most favorable, NO.(3 and 9) the least favorable in commingling production. Whatever single-layer or commingling production, the favorable area is distributed in the north part of this block, which coincide with the 1-year production status.