A new cluster analysis method based on the gray relational grades is formulated through the combination of geological cluster analysis with gray system theory.

通过灰色系统理论与地质学中的聚类分析方法的结合，提出了一种基于灰色关联度的聚类分析新方法。

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The physical concept model of a two-aquifer system was established by the comprehensive analysis of the geological and hydrogeological conditions in Huaibei city.

通过对淮北市地质、水文地质条件的综合分析，建立了淮北市双含水层系统水文地质概念模型。

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Based on the analysis and illustration of coal-bed gas and its relative conceptions system, the idea of geological research system of coal-bed gas and method of research are put forward.

在分析、阐述煤层气及相关概念体系的基础上，提出煤层气地质研究系统的概念和研究思路。

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