The selection of evaluation methods for coalbed methane (CBM) reservoirs

In order to improve the efficiency of the coalbed methane reservoir evaluation, this paper analyzed the characteristics of various methods and tools currently used for coalbed methane reservoir evaluation on the basis of summarizing previous work and according to the tasks and procedures of the relevant work. In the aspects of data acquisition, the establishment of the evaluation index system and the choice of the evaluation and calculation methods, the authors analyzed the degree of influences upon the accuracy, precision and reliability of the evaluation. It is held that, with the deepening utilization of the computer technology, simpler methods can be chosen according to the working objective of the evaluation, and the visualization of the methane reservoir evaluation result can be greatly improved. In addition, using the same set of data, the authors compared the results of the analytical process and difference between the common comprehensive evaluation method and the entropy method.