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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 434583, 6 pages
http://dx.doi.org/10.1155/2015/434583
Research Article

Attribute Synthetic Evaluation Model for the CBM Recoverability and Its Application

School of Science, Xi’an University of Science and Technology, Xi’an 710054, China

Received 30 September 2015; Revised 24 October 2015; Accepted 25 October 2015

Academic Editor: Muhammad N. Akram

Copyright © 2015 Xiao-gang Xia and Yun-feng Yang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The coal-bed methane (CBM) recoverability is the basic premise of CBM development practice; in order to effectively evaluate the CBM recoverability, the attribute synthetic evaluation model is established based on the theory and method of attribute mathematics. Firstly, five indexes are chosen to evaluate the recoverability through analyzing the influence factors of CBM, including seam thickness, gas saturation, permeability, reservoir pressure gradient, and hydrogeological conditions. Secondly, the attribute measurement functions of each index are constructed based on the attribute mathematics theory, and the calculation methods of the single index attribute measurement and the synthetic attribute measurement also are provided. Meanwhile, the weight of each index is given with the method of similar number and similar weight; the evaluation results also are determined by the confidence criterion reliability code. At last, according to the application results of the model in some coal target area of Fuxin and Hancheng mine, the evaluation results are basically consistent with the actual situation, which proves that the evaluation model can be used in the CBM recoverability prediction, and an effective method of the CBM recoverability evaluation is also provided.