Department;
of;
Earth;
Resources;
and;
Geosciences,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou;
221008,;
China;
Department;
of;
Earth;
Resources;
and;
Geosciences,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou;
221008,;
China;
Department;
of;
Earth;
Resources;
and;
Geosciences,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou;
221008,;
China;
coal-bed; reservoir,; flexibility; energy,; coal-radix; flexibility; energy,; groundwater; flexibility; energy,; gas; flexibility; energy,; coal-bed; gas; reservoir; formation;