The Genetic Model and Evidence of Sulphuric Corrosion on the Oolitic Beach Reservoir of Feixianguan Formation in Northeast Sichuan Basin
川东北飞仙关组鲕滩储层硫酸溶蚀的证据和模式探讨

The main reservoir space in oolitic beach is the corrosion cavern formed by the corrosion action of atmospheric fresh water, organic acid and sulphuric acid. Based on lots of experiments, such as experiments on sulphuric corrosion, the comparison between the content of hydrogen sulfides and the thickness of gypsum and the comparison of sulfur isotopes between the gas and the strata, the authors hold that sulphuric acid must have played an important role in the formation of the reservoir. The model for the sulphuric corrosion and the reservoir formation has been studied. Corrosion is helpful to forming the relatively good combination of reservoir and cap rock because it increases the porosity and permeability of the reservoir.