Among uranium deposits in sedimentary basins, sandstone-type uranium deposits are epigenetic. The development scales of sandstone-type uranium deposits are controlled by tectonic events, provenance, sand bodies, uranium sources, and reducing media, including that reducing media control the scales of redox transition zone. Dispersed organic matter (DOM) within sandstones, e.g., carbonaceous debris (CD), is one of the important reducing media. The characteristics of organic petrology and element of CD are similar in those of coals, being grouped into type III kerogen. However, the origin of CD within sandstones is unclear. Uranium occurs in uranium-bearing matter and uranium mineral, and coexists with CD in space. Adsorption, complexation, and reduction of organic matter are responsible for the mobility and precipitation of uranium in sediments. The adsorption and complexation capacity of DOM is the most intensive at the stage of immaturity to low maturity, and decreases with the increasing coalification. The reduction capacity is linked to organic matter maturity. Besides, porous macerals could provide the channels for uranium-bearing fluid migration and the space for uranium preconcentration. Under certain physical and chemical conditions, uranium-bearing fluid could permeate into macerals, and react, i.e., trapping followed by reduction. Nevertheless, the coordination characteristics of uranium within uranium-bearing DOM should be further investigated. Uranium enrichment concurrently alters organic matter, causing an increase in organic matter maturity and anisotropy through the effects of radiogenic heat or α-irradiation-induced crosslinking. However, α-irradiation-induced crosslinking should be the primary way. Besides, contributions of CD to uranium mineralization should be reckoned.

在沉积盆地的铀矿床中，砂岩型铀矿床是后生的。砂岩型铀矿床的发育规模受构造事件、物源、砂体、铀源和还原介质的控制，包括还原介质控制氧化还原过渡带的规模。砂岩中的分散有机物 (DOM)，例如碳质碎屑 (CD)，是重要的还原介质之一。煤的有机岩石学特征和CD元素与煤相似，属于Ⅲ型干酪根。然而，砂岩中CD的起源尚不清楚。铀存在于含铀物质和铀矿物中，在空间中与CD共存。有机质的吸附、络合和还原是铀在沉积物中迁移和沉淀的原因。DOM的吸附和络合能力在未成熟到低成熟阶段最为强烈，随着煤化程度的增加而降低。还原能力与有机物成熟度有关。此外，多孔材料可以为含铀流体运移提供通道和铀预富集的空间。在一定的物理和化学条件下，含铀流体会渗入微晶中并发生反应，即捕集后还原。然而，应进一步研究含铀 DOM 中铀的配位特性。铀浓缩同时改变有机质，通过辐射热或α-辐射诱导的交联作用导致有机质成熟度和各向异性增加。然而，α-辐照诱导的交联应该是主要方式。此外，CD对铀矿化的贡献也应考虑在内。