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四川盆地下三叠统飞仙关组储层是中国目前发现的次生溶蚀孔洞最发育、埋藏最深、优质碳酸盐岩储层最发育、储层有效厚度最大的碳酸盐岩储集层;同时飞仙关组气藏也是中国硫化氢含量最高的气田.研究发现,飞仙关组优质储层的形成与硫化氢之间存在十分密切的关系.含硫化氢的酸性流体与碳酸盐岩发生流体-岩石相互作用,促进了碳酸盐岩次生孔隙的形成.通过对飞仙关组储层碳酸盐岩岩芯样品在含硫化氢饱和水溶液中溶蚀试验发现,经过硫化氢的溶蚀,储层的孔隙度、渗透率得到大幅度的提高,孔隙度平均增大2%,渗透率增大幅度最大,平均将近提高两个数量级,岩石的密度也明显变轻,从而证实了硫化氢的溶蚀作用对飞仙关组优质储层形成所起到的关键作用.储层岩石学特征也证实了硫化氢对碳酸盐岩的溶蚀改造作用.
The Lower Triassic Feixianguan Formation reservoir in Sichuan Basin is the most developed and buried carbonate sandstone reservoir with the most developed carbonate reservoir and the most effective reservoir thickness in China Meanwhile, the Feixianguan Formation gas reservoir is also the gas field with the highest content of H2S in China.The study found that there is a close relationship between the formation of high-quality reservoirs and the hydrogen sulfide in the Feixianguan Formation.Hydrogenic acid-containing fluid and carbonate Fluid-rock interaction occurs, which promotes the formation of carbonate secondary pores.By the dissolution test of Feixianguan formation carbonate rock core samples in saturated aqueous hydrogen sulfide solution, The porosity and permeability of the reservoir have been greatly improved. The average porosity increases by 2% and the permeability increases by a maximum of two orders of magnitude on average, and the density of the rock is obviously lighter. Thus, the vulcanization The dissolution of hydrogen plays a key role in the formation of high-quality reservoirs in Feixianguan Formation, and the petrological characteristics of reservoirs also confirm the dissolution and reformation of carbonate rocks by hydrogen sulfide.