腐质(detritus)在污水处理方面，指密度比水大的能被流动水输送的粗有机物残渣。在生物学意义上，指有机的颗粒物质。
坠落的枝叶铺在茶园，肥沃的腐质土壤复滋润了茶树。
When its leaves fall, they decompose and create a nutritious soil, nourishing the tea trees nearby.
暗色泥岩有机质丰度中等—好，以腐泥—腐殖型和腐殖型为主，普遍进入成熟—高成熟阶段，是好的烃源岩。
Dark mudstone works as good source rock, with middle-good organic abundance, sapropel-humic and humic organic types as well as mature-high mature generation stage.
有机地球化学研究表明，西部第三系生油岩有机质类型主要以混合型为主，兼有部分腐泥型和腐殖型。
Studies on organic geochemistry show that the organic matter of the Tertiary oil-generating rocks in the west is mainly mix-typed, and part of it belongs to sapropel and humic types.
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