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湘西上震旦统、下寒武统黑色岩系主要由富碳硅质页岩、石煤、硅质页岩、硅质岩、磷块岩和重晶石岩等组成。有机质属于腐泥型， 无形态组分是黑色岩系的主要显微组分类型， 微粒体、细粒状体呈密集状组成岩石的基质。有形态组分总体含量较低， 多为藻类体， 零星分布于基质中， 表明一方面有机质受热演化程度较高， 另一方面表明有机质来源于浅水台地边缘。湘西黑色岩系中有机质主要来源于藻、菌类生物， 台缘斜坡带是有机质聚集的有利场所， 缺氧环境 （事件） 主要起因于藻类的大量发育与有机质降解的耗氧过程， 为有机质得以保存、转化提供了必要条件。
Upper Sinian and Lower Cambrian black rock series in western Hunan are mainly composed of carbon-rich siliceous shale, stone coal, siliceous shale, silicalite, phosphorite and barite. The organic matter belongs to the sapropel type. The non-morphological component is the main microscopic component type of the black rock series. The microsome and the fine-grained body are the dense matrix of the rock composition. The content of morphological components is generally low, mostly algae, sporadic distribution in the matrix, indicating that on the one hand, the degree of thermal evolution of organic matter higher, on the other hand that organic matter from the edge of shallow water table. The organic matter in the black rock series of Xiangxi originates mainly from algae and fungi. The marginal zone of the margin is a favorable site for the accumulation of organic matter. The hypoxia environment (event) is mainly caused by the massive development of algae and the oxygen consumption process of organic matter degradation, Preservation, conversion provided the necessary conditions.