The residual basins were deeply buried in Himalayan Period,and the Carboniferous System was piecemeal distributed in the depressed belts of orogenic zone.

• 巴颜浩特盆地的东部坳陷和南部坳陷，石炭系残留面积大，沉积厚度大，烃源岩类型齐全，既有暗色泥岩又有碳酸盐岩和可燃有机岩，具有较高的生烃潜力；