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针对我国广泛分布的碳酸盐-硫酸盐岩混合建造,选择其中的硫酸盐岩作为研究对象,通过室内水-岩和水-岩-细菌两个封闭系统的硫酸盐岩溶蚀模拟实验,模拟了细菌数、温度、时间等因素对反应系统水化学组分的影响,研究了两个系统内的地球化学作用.结果表明,水-岩系统内发生的是硫酸盐岩溶解作用;水-岩-细菌系统内发生了细菌硫酸盐还原作用和细菌硫酸盐还原驱动的硫酸盐岩溶解作用,导致埋藏环境硫酸盐岩岩溶的发育,进而增强了与硫酸盐岩共生的碳酸盐岩的渗透性.研究成果开拓了油气储层古岩溶研究的新思路.
According to the widely distributed carbonate-sulphate mixed construction in China, the sulphate rock is selected as the research object. Through the sulfate erosion simulation experiment of two closed systems of indoor water-rock and water-rock-bacteria, The effects of bacteria, temperature, time and other factors on the chemical composition of the reaction system were studied. The geochemical processes in the two systems were studied. The results show that dissolution of sulfate rock occurs in the water-rock system, Bacterial sulfate sulfate reduction and bacterial sulfate reduction-driven karstification occur within the bacterial system, leading to the development of karst in burial environment and further enhancing the permeability of carbonate rocks symbiotic with sulphate. The research results have opened up new ideas for paleokarst research in oil and gas reservoirs.