第三纪是重要的聚煤时期之一,第三纪煤田分布比其他任一聚煤期形成的煤田都广。虽然煤质大部分仍属褐煤,但由于其埋藏较浅、构造简单,有时煤层厚度极大,适于进行露天开采,加上近年来重视煤的气化和液化,对第三纪褐煤的开采量逐渐增加。由于第三纪煤盆地面积通常较小,加上煤层 The Tertiary is one of the important coal-accumulating periods. The Tertiary coalfield is more extensively distributed than any other coal-forming period. Although most of the coal is still lignite, it is suitable for open-pit mining due to its shallow burying, simple structure and sometimes extremely thick coal seam. In addition, emphasis has been put on the gasification and liquefaction of coal in recent years, Gradually increase the amount. Since the Tertiary coal basin is usually small in area, with coal seams