The coal bed has a low mechanical strength and porosity in comparison with the normal oil and gas formation, so it is easy to collapse and easy to be polluted.
煤层与一般油气层相比，机械强度低，孔隙度低，所以易坍塌、易污染。
The coal bed has a low mechanical strength and porosity in comparison with the normal oil and gas formation, so it is easy to collapse and easy to be polluted.
煤层与一般油气层相比，机械强度低，孔隙度低，所以易坍塌、易污染。
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