Having analysized the degree of crystallization of andalusite, it is believed that the anthracite is a low-grade thermal metamorphic rock.
从红柱石的结晶程度分析，这种无烟煤是一种低级热接触变质岩。
The factors related with metamorphic reservoir space are crystallization, structure, physical weathering, and chemical eluviation.
变质岩储集空间形成主要有：结晶成因、构造成因、物理风化成因、化学淋溶成因。
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