木里煤田是青海省重要的煤产地,煤类以炼焦用煤为主.聚乎更矿区四井田位于木里煤田的最西端,经详查、勘探提交煤炭资源量2.5亿t,煤类为气煤、1/3焦煤、焦煤、1/2中粘煤、弱粘、瘦煤、贫瘦煤、贫煤、不粘煤.通过对下2煤层物理性质、化学性质、煤岩特征及煤类的统计分析,认为区内同一煤层的变质程度随含煤地层和上覆岩系的总厚度增大而增高,在垂向上随煤层层位的降低而增高；四井田总体构造形态为倾向南西的单斜构造,其煤类分布总体表现北东到南西沿煤层倾向变质程度逐渐增高,沿煤层走向呈带状分布,但在井田边界断层附近煤的变质程度要比其它地段相同深度煤层的变质程度稍高;四井田煤的变质作用类型主要为深成变质作用,部分地段受动力变质作用影响.%The Muri coalfield is an important coal district in the Qinghai Province, coal rank is mainly coals for coking. The Fourth minefield in the Juhugeng mine area is situated at westernmost end of the Muri coalfield. Totally 0.25 billion tons of coal resources have been submitted after general exploration and detailed exploration, coal ranks have gas coal, 1/3 coking coal, coking coal, 1/2 medium caking coal, weakly caking coal, lean coal, meager lean coal, meager coal and non-caking coal. Through the statistical analysis of the L2 coal seam physical and chemical properties, lithotype of coal and coal rank, considered that the degree of coal metamorphism of a same coal seam in the area will be risen along with the coal-bearing strata and overburden total thickness increasing, vertically risen along with the coal horizon deepening. Overall structural form of the minefield is a monocline dipped to southwest, degree of coal metamorphism rising from northeast to southwest and formed banded zoning along the coal seam strike, but degree of coal metamorphism near the minefield boundary fault is slightly higher than coal seams with same depth in other sectors. Metamorphic type of coal in the minefield is mainly hypozonal metamorphism, but in part sectors affected by dynamic metamorphism.
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