煤层

méi céng hòu dù

煤层厚度

coal seam thickness

méi céng mì dù

煤层密度

density of seam

báo méi céng

薄煤层

thin seam

zhè ge dì qū méi céng zhī zhōng zhù yǒu dà liàng de jiǎ wán qì tǐ

这个地区煤层之中贮有大量的甲烷气体。

There are substantial reserves of methane gas trapped in coal seams in the area.