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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。
Puguang gas field dissolution at the same age formed a large number of oolitic hole, bio-pore and intragranular dissolved pores, and has an effective preservation mechanism. The first burial dissolution is associated with acidic water rich in organic acids and is strongly eroding, forming a large number of secondary pores such as intragranular dissolved pores, intergranular dissolved pores, intergranular dissolved pores and karst caves. Cenozoic dissolution, the first burial dissolution and dolomitization formed the main pore types of high quality reservoirs, which formed the main reservoir lithology of high-quality reservoirs. These two stages of dissolution and dissolution directions are in line with the porosity variation of the Puguang Gas Field and are the key erosion periods. These are the important conditions for the formation of high-quality oolitic beach reservoirs. The second burial dissolution to CO2 and H2S-based. The third period of burial dissolution is related to cracks and H2S. However, the structure of the edge of the asphalt ring marked H2S erosion in the flakes is rare in the interior of the pores. The source of H2S in the Puguang gas field is also not related to gypsum. And elemental sulfur in the reservoir may be the main reason for the formation of H2S.