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热化学硫酸盐还原反应(TSR)对气藏有改造作用.以高压釜模拟实验为基础,选取甲烷与硫酸钙反应的动力学模型求取动力学参数,并结合普光地区的热史和埋藏史再现地质条件下甲烷与硫酸盐岩的反应过程,得出在距今130Ma(早白垩世)的飞仙关组甲烷发生了硫酸盐还原反应,反应起始温度210℃,持续至30Ma前反应终止;TSR的累积消耗甲烷量仅2.4%,说明在飞仙关组TSR对甲烷的后期损耗较少,因此并不影响甲烷的后期保存,这对于较深的碳酸盐岩储层依然具有勘探意义.
Thermo-chemical sulfate reduction (TSR) has been reformed on gas reservoirs.Based on the autoclave simulation experiment, kinetic parameters of methane and calcium sulfate reaction are selected to get the kinetic parameters, and combined with the thermal history and burial history of the Puguang region Reproduction of methane and sulfate under the geological conditions of the reaction process, concluded that 130Ma (Early Cretaceous) Feixianguan formation of methane sulfate reduction reaction occurred, the reaction start temperature 210 ℃, until 30Ma before the termination of the reaction . The accumulated methane consumption of TSR is only 2.4%, which shows that the TSR in Feixianguan Formation has less post-depletion loss of methane and therefore does not affect the post-preservation of methane, which is still of exploration significance for deeper carbonate reservoirs .