临沂煤田煤变质受多种地质因素的影响,但是,各种煤质指标仍有其变化规律。区域变质作用使煤质达气肥煤阶段,岩浆侵入发生接触变质和气热变质作用,使煤质变为无烟煤和天然焦,煤的变质是上述各种变质作用的有效迭加,在广大区域内,区域变质作用为主,而在局部区域里可能岩浆侵入接触变质等的改造是主要的。 Coal metamorphism in Linyi coalfield is affected by many geological factors, however, various coal quality indicators still have their changing rules. Regional metamorphism makes the coal metamorphic coal and gasification metamorphism and gas metamorphism, the coal quality into anthracite and natural coke, coal metamorphism is an effective superposition of the above metamorphism, in the vast area , The main regional metamorphism, and in some areas may be magmatic intrusion metamorphic transformation is the main.