Authigene Karbonate und CO2-Quellen in Reservoirgesteinen der CO2 Provinz im Niedersächsischen Becken

..。对泽克斯坦碳酸盐岩中的自生矿物进行了详细的稳定碳、氧同位素研究。结合埋藏和温度历史，这些结果将可以确定它们的碳源(S)，并推断成岩(碳酸盐形成)过程的反应温度。此外，我们还试图将晚期(St)(即最年轻)自生碳酸盐成矿作用与储层中的气体(分子和同位素)组成联系起来。将使用新的分析技术(激光烧蚀碳酸盐同位素分析的微型样品制备)和碳酸盐矿物包裹体气体(二氧化碳、甲烷)的碳同位素分析。如果已知岩石史中二氧化碳来源的变化，就可以使用盆地模拟软件来模拟天然气的成分和气量。

... We propose a detailed stable carbon- and oxygen isotope study of authigenic minerals in the Zechstein carbonate rocks. In combination with burial and temperature histories, the results will allow to define their carbon source(s) and infer reaction temperatures of diagenetic (carbonate-forming) processes. Moreover, we try to relate the late(st) (i.e. youngest) authigenic carbonate mineralisations to the gas (molecular and isotope) composition in the reservoirs. New analytical techniques (micro-scaled sample preparation for isotope analyses of carbonates by laser ablation) and carbon isotope analyses of gases (CO2, CH4) from inclusions in carbonate minerals will be used. If the variations of the CO2 sources during rock history are known, gas compositions and gas quantities can be modelled using basin modelling software.