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Evolution of formation water chemistry and geochemical modelling of the CO2CRC Otway Site residual gas saturation test

机译:CO2CRC奥斯威地区剩余气体饱和试验的形成水化学和地球化学建模的演变及地球化学建模

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The CO2CRC Otway Project Stage 2B field test was a residual CO2 saturation and dissolution experiment carried out on the Paaratte Formation in the Otway Basin of Australia. During the 87 day test a downhole U-tube sampling assembly was used to collect formation water samples at various time intervals. The waters were analysed for chemical composition, dissolved gas content and stable isotopic composition of H and O. Changes in the chemical and isotopic composition of the formation water were observed from the initial baseline samples collected through to the conclusion of the test. Systematic reoccurrences of relatively large linear changes in the alkalinity, Ca~(2+), Fe~(2+), Mg~(2+) and SiO_(2(aq)) were observed during different test sequences. Similar behaviour occurred for the δ~(18)O and δ~2H values suggesting a complex system controlled by at least two processes. The chemical evolution was consistent with CO2-water-rock interactions, dominated by carbonate dissolution with some silicate dissolution. The mineral dissolution driven changes in water composition are overlain by what was clearly mixing of the injected and in situ formation water. The isotopic composition of the water was used to confirm the role of mixing and the calculated residual gas saturation values were broadly consistent with those derived by other methods. The extent of reaction in the relatively short time frame of the test was used to evaluate the capabilities of kinetics based reaction path models. The models were generated using published reaction rate data with commonly used assumptions regarding upscaling of reactive surface area. These assumptions consist of reducing the calculated geometric surface area that accounts for grain shape and roughness by factors of 100 to 1000 depending on the mineral habit. The numerical models provided a very good fit to the field data indicating that the rate data and the associated assumptions are relatively robust.
机译:CO2CRC OTWay项目阶段2B场测试是澳大利亚Otway盆地的Paaratte形成进行的残余二氧化碳饱和度和溶出实验。在87天测试期间,使用井下U形管采样组件以各种时间间隔收集地层水样。分析水的化学成分,溶解气体含量和H和O的稳定同位素组成。从收集到试验结束的初始基线样品中观察到地层水的化学和同位素组成的变化。在不同的试验序列期间观察到碱度,Ca〜(2+),Fe〜(2+),Mg〜(2+)和SiO_(2(2(2(aq))中相对较大的线性变化的系统再循电。 δ〜(18)o和δ〜2h值发生类似的行为,暗示由至少两个过程控制的复杂系统。化学进化与CO 2水岩相互作用一致,由碳酸酯溶解带来了一些硅酸盐溶解。通过清楚地混合喷射和原位形成水,矿物溶解驱动的水组合物的变化覆盖。水的同位素组合物用于确认混合的作用,并且计算的残余气体饱和度值与其他方法所衍生的那些呈广泛一致。测试中相对较短的时间帧中的反应程度用于评估基于动力学的反应路径模型的能力。使用公开的反应速率数据产生模型,其具有关于反应性表面积的升高的常用假设。这些假设包括减少计算出的几何表面积,根据矿物习惯,通过100至1000的因素来计算晶粒形状和粗糙度。数值模型提供了非常好的拟合,指示速率数据和相关假设是相对稳健的。

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