The results show that the long-flame coal distributs in the six coal-rich regions, the lignite distribute in southwest and north central region and gas coal distribute in south central of eastern depression on plane.

• 在平面上，长焰煤在东部凹陷的6个赋煤区均有分布，褐煤分布于东部凹陷西南端和中北部，气煤则集中分布于该凹陷的中南部。