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砂岩在成岩过程中,次生矿物多达20余种。次生石英、钠长石、方解石和浊沸石等的形成不同程度地影响了砂岩的储集物性。形成次生石英的SiO2主要来源于碎屑长石的溶解粘土矿物的转化。次生长石与长石的钠长石化过程有关,斜长石钠长石化始于成岩早期,而钾长石的钠长石化则需较高的成岩条件才能进行。次生方解石主要为成岩早期的无机CaCO3沉淀。浊沸石则是晚成岩阶段的稳定矿物,并与成岩晚期钠长石化有关。
Sandstone diagenetic process, as many as 20 kinds of secondary minerals. The formation of secondary quartz, albite, calcite and laponite affected the reservoir properties of sandstone to varying degrees. The formation of secondary quartz SiO2 comes mainly from the conversion of clastic feldspar dissolved clay minerals. The secondary feldspar is related to the feldspar albite process. The plagioclase feldspar begins in the early stage of diagenesis, while the albite of the K-feldspar requires higher diagenesis conditions. Secondary calcite is mainly diagenetic inorganic CaCO3 precipitation. The laumontite is a stable mineral in the late diagenetic stage and is related to late agratism of diagenesis.