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在大量岩石学和铸体薄片研究的基础上，运用Ｘ衍射等分析手段，对吐拉盆地嘎斯煤矿附近侏罗系地层中砂岩的成岩作用、孔隙演化及成岩阶段等特征作了详细研究，认为孔隙的发育既受沉积条件控制，又受埋藏成岩作用的影响。机械压实作用是导致砂岩孔隙结构变差的主要因素；早期碳酸盐胶结作用弱，使得后期的溶解改造作用也较弱；造成了砂岩的有效储集空间较差的结果。构造作用使得岩石中裂隙发育，提高了岩石孔渗性，极大地改善了岩石的储集性能，形成了较好的储层。
On the basis of a large number of petrology and cast thin films, the characteristics of diagenesis, pore evolution and diagenesis of sandstone in the Jurassic strata near Gaas Coal Mine in the Tula Basin are studied in detail by means of X-ray diffraction , Think that the development of the pore is controlled by sedimentary conditions and burial diagenesis. Mechanical compaction is the main factor that leads to the deterioration of pore structure of sandstone. The early carbonate cementation is weak, which results in the weak dissolution and reformation in the later stage, resulting in the poor sandstone effective storage space. The tectonic action makes the fissures develop in the rock, improves the porosity and permeability of the rock, greatly improves the reservoir performance of rocks, and forms a good reservoir.