分析了近源沉积物、成岩作用及粘土矿物演化对低渗透储层物性的影响，复杂的成岩作用是低渗透储层非均质性的主要成因。
These influence of physical property of low permeable reservoir by the sediment of short source, diagenesis and evolution of clay minerals are analysed.
研究结果表明，下石盒子组主要为一套近源网状河流沉积。
Research results show that Lower Shihezi Formation is mainly a set of proximal braided river deposits.
近岸的浅水条件，丰富的陆源细碎屑，局部的还原相带，是形成富铀沉积物的三个基本条件。
Nearshore shallow water environment, abundant terrestrial fine detritus, local reduction facies and zones are three cardinal conditions for the formation of uranium-rich sediments.
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