Knowledge Network Node
Journal of China Coal Society. 2014, (08) Core

Impermeability evaluation method and its application on the ancient weathering crust of carbonatite in Middle Ordovician system in North China coalfieldChinese Full Text

WU Qiang;JIA Xiu;CAO Ding-tao;LIANG Yong-ping;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining ＆ Technology(Beijing);Yanzhou Coal Mining Co.,Ltd.;Institute of Karst Geology,Chinese Academy of Geological Sciences;

Abstract: With the gradual increase in mining depth and the lower coal seam group mining in North China coalfield,the problems of water inrush into coal mine from the Ordovician carbonatite aquifer underlying the coal seam group and the goaf water flow pollution to the Ordovician carbonatite aquifer are growing seriously.According to systematic statistics and analysis of a large number of geological exploration data in the central coalfield of Yanzhou Shandong Province,author carried out a comprehensive study of the ancient weathering crust impermeability from the weathering crust thickness,drilling core recovery rate,drilling fluid consumption,weathering fracture development and filling degree,geological tectonic development and other aspects of the Middle Ordovician limestone,and established the indicator system to characterize its impermeability,and applied the powerful data management and spatial analysis functions of GIS and information fusion technology to create a GIS-oriented information fusion impermeability evaluation method—aquifuge index method,and put forward technology roadmap and specific work procedures of the aquifuge index method,and has applied the method to a real project.
Keywords：

North China coalfield; carbonatite in Middle Ordovician; ancient weathering crust; impermeability; aquifuge index method;

  • DOI：

    10.13225/j.cnki.jccs.2014.9002

  • Series：

  • Subject：

  • Classification Code：

    TD745

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