宁夏韦州矿区煤层挥发分特征与变质因素探讨

A Discussion on Coal Volatile Matter Features and Metamorphic Factors in Weizhou Mine Area,Ningxia

韦州矿区地处华北地台西侧与秦祁孤形褶皱带交汇处,含煤地层为石炭—二叠系太原组和山西组,赋存丰富的焦性煤炭资源。通过对矿区煤的挥发分及煤类在垂向、横向上变化规律分析,认为韦州向斜东翼煤层沿倾向呈现深成变质作用,主要以肥煤和焦煤为主,而沿向斜东翼往南、转向西翼,煤层变质程度急剧增高,达到中高变质程度的贫煤和无烟煤,矿区西侧青铜峡—固原断裂西部深处有隐覆岩体存在,使煤层在深成变质作用基础上,叠加了区域岩浆热力变质作用,导致矿区西部煤的变质程度增高。

The Weizhou mine area is located at the junction of North China Platform west side and Qinling-Qilian arcuate folded belt. Coal-bearing strata belong to Permo-Carbonaceous Taiyuan and Shanxi formations with abundant coal resources for coking. Through analyses of coal volatile matter and coal rank vertical, horizontal variation patterns, considered that coal seams in the Weizhou syncline east limb reveal themselves hypozonal metamorphism and mainly fat coal and coking coal, while southward along the east limb then turning into west limb the degree of metamorphism is increasing sharply, coal ranks are become to medium high metamorphosed meager coal and anthracite. Because of igneous rock mass in deep part of the Qingtongxia-Guyuan fault west side, the thermal metamorphism has staked onto the hypozonal metamorphism and degree of metamorphism of coal seams in west part of Weizhou mine area increased.