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为了揭示油气盆地埋藏环境中碳酸盐岩和硫酸盐岩共生时的岩溶发育机制,以硫酸盐岩为研究对象,采用室内模拟实验与野外实测资料相结合的方法,分析了温度、SO42-浓度和时间等因素对水-岩-细菌封闭系统内稳定硫同位素的影响,并指出硫同位素对地球化学作用的指示意义.结果表明,细菌硫酸盐还原形成的H2S中硫同位素分馏明显,并受系统的温度和开放性等因素影响.结合鄂尔多斯盆地奥陶系风化壳中充填的黄铁矿硫同位素特征,提出了鄂尔多斯盆地奥陶系岩溶的生物成因模式;揭示了风化壳顶部的黄铁矿化与风化壳下部压释水岩溶共生的机制,建立了生物岩溶发育的硫同位素地球化学标志.研究成果拓宽了岩溶的压释水成因机制.
In order to reveal the mechanism of karst development during the coexistence of carbonate rocks and sulphate rocks in the buried environment of oil and gas reservoirs, taking sulphate as the research object, the indoor temperature and SO42- concentration were analyzed using a combination of laboratory simulation and field measurements. And time on the stability of sulfur isotopes in the water-rock-bacteria closed system and pointed out the significance of sulfur isotopes on geochemistry.The results show that the sulfur isotope fractionation of H2S formed by bacterial sulfate reduction is obvious, Temperature and openness of the Ordos Basin.According to the sulfur isotopes of pyrite filled in Ordovician weathering crust in the Ordos Basin, the biogenic genesis of the Ordovician karst in the Ordos Basin is proposed, and the pyrite mineralization at the top of the weathering crust is revealed And the weathering crust karst karst symbiotic mechanism, the establishment of bio-karst sulfur isotope geochemical markers. The results of the research broaden the karst causes of the mechanism of the pressure water.