中国煤层气目标区综合评价与优选研究

Research on Comprehensive Evaluation and Ranking of China's Coal Bed Methane Perspectives

煤层气是一种高潜力洁净能源,中国煤层气资源丰富,目前国内外资金已经纷纷投入到煤层气的开发中来。煤层气选区评价关系到勘探能否成功,是煤层气勘探的基础工作,因此迫切需要对中国整体煤层气特别是基于矿区层次的资源状况进行整体分析和评价。本研究在大量收集煤层气资源基础材料和借鉴前人研究成果的基础上,从地质背景、煤储层、资源以及开发基础等4个因素出发,确定了煤层气矿区评价参数选择标准,建立了煤层气目标区资源评价指标体系,采用无量纲化指标处理并通过层次分析法对中国煤层气矿区进行资源优选排序,确定了中国煤层气开发优选目标及不同优选层次。研究结果显示,中国有利的煤层气目标区主要集中于冀鲁豫皖和晋陕蒙含气区内,包括三交北、侏罗系、韩城、潞安、大青山、中梁山、晋城、乡宁、六盘水、吴堡等主要矿区。

Coal bed methane （CBM） is a clean energy with high potential and China is rich in such recource. CBM is under rapid development with more and more investment into its exploitation in recent years. The evaluation of CBM perspectives affects the exploration results and it is the basic work for CBM exploration, so it is highly necessary to conduct comprehensive analysis and evaluation on Chinese CBM perspectives. Having collected lots of basic materials of CBM resource, we combined former research results with geological characteristics to investigate the influencing factors of CBM exploitation potential in the paper. Four factors, including geological background, CBM reservoir, resource and exploitation basis, were used to determine the assessment indices for CBM exploitation potential and an index system was built. These indices were firstly processed dimensionlessly for comparison. Then, the corresponding processing functions have been designed for different types of indices. Besides, a special group of processing functions with value limitation of the indices was employed. The weight values of indices were determined by Analytical hierarchy process （AHP）, which was also used for the comprehensive evaluation and ranking process of the CBM exploitation potential. The practical applications of these processing and evaluation methods were done based on the data of resource and geological conditions of the selected 85 regions with CBM perspectives in China, and a comprehensive evaluation and ranking result were obtained in this paper. Based on the results, some suggestions are given on the priority ranks in developing the CBM regions in China. The advantageous target regions are mainly located in Hebei-Shandong-Henan-Anhui and Shanxi-Shaanxi-Inner Mongolia gas bearing area, including Sanjiao north, Hancheng, Lu＇ an, Daqingshan Moutain, Zhongliangshan Mountain, Jincheng, Xiangning, Liupanshui and Wubao perspectives. Since CBM can ease present resource pressure in China and improve resource structure and environment, its multiple economic and social benefits can play an important role in the continuous development of economy and society. The evaluation criteria of Chinese coal bed methane perspectives election established in the paper can be used as reference for CBM perspectives election, and it can also benefit and accelerate the development of CBM in China in the near future.