普光气田同生期溶蚀作用形成大量的鲕模孔、生物模孔及粒内溶孔，并具有有效的保存机制。第1期埋藏溶蚀与富含有机酸的酸性水有关且溶蚀强烈，形成大量的粒内溶孔、粒间溶孔、晶间溶孔和溶洞等次生孔隙。同生期溶蚀、第1期埋藏溶蚀和白云岩化作用形成优质储层的主要孔隙类型，构成优质储层的主要储集岩性。这2期溶蚀作用和溶蚀方向符合普光气田孔隙度变化规律，是关键溶蚀期次，是鲕滩优质储层形成的重要条件。第2期埋藏溶蚀以CO₂和H₂S为主。第3期埋藏溶蚀与裂缝和H₂S有关，但薄片中标志H₂S溶蚀的沥青环边位于孔隙内部的构造并不多见，普光气田中H₂S来源也与石膏关系不大，含硫铁矿烃源岩和储层中单质硫可能是H₂S形成的主要原因。

A lot of oolitic model pores,biological model pores and intragranular dissolved pores were formed during syngenetic dissolution stage in the Puguang gas field,and had an effective preservation mechanism. At the first stage of buried dissolution,the acidulous water enriched organic acid with strong dissolution causes the formation of intragranular dissolved pore,intergranular dissolved pore,intercrystalline dissolved pore and cave etc. The syngenetic dissolution and the first stage buried dissolution with dolomitisation generated the main pore type of high-quality reservoir,constituted the main reservoir rocks,and coincided with the porosity change regularity; they were two key dissolution stages,were necessary and sufficient condition to the forming of high-quality oolitic reservoir. The second stage of buried dissolution mainly dissolved with CO₂ and H₂S,and the third stage of buried dissolution related to the crack and H₂S. But in thin slice,it′s seldom the mark of H₂S erosion,namely,the asphalt rim lies in the internal of pore. In Puguang gas field,the origin of H₂S has less relationship with anhydrite,source rock containing FeS₂ and sulphur in reservoirs are probably the main reason of the origin of H₂S.