The Green River Natural Analogue as A Field Laboratory To Study the Long-term Fate of CO2 in the subsurface
The Green River Natural Analogue as A Field Laboratory To Study the Long-term Fate of CO2 in the subsurface
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绿河自然模拟作为研究地下二氧化碳长期归宿的现场实验室
DOI：
10.1016/j.egypro.2014.11.304
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Busch A
中科院分区：
文献类型：
--
作者：
Busch A
了解CO2注入多孔储层的长期响应是证明安全和永久储存的最重要方面之一。为了提供定量约束的长期影响的CO2充电的流体的完整性的盖层系统，我们恢复了约300米的核心从科学钻孔通过天然CO2水库，附近的绿色河，犹他州。我们获得了地质力学，矿物学，地球化学，岩石物理和矿物学实验室数据沿着整个长度的核心和非CO2充电的控制样品。此外，我们进行了更详细的研究，通过部分低渗透率层直接接触CO2充电层。这样做是为了限制CO2促进的流体-矿物反应前沿的性质和渗透深度。确定的主要反应包括成岩白云石胶结物和赤铁矿颗粒涂层的溶解，以及铁白云石和黄铁矿的沉淀，并已用作地球化学一维反应输运模型的输入，以限制矿物-流体反应前沿的幅度和速度。此外，我们比较了二氧化碳的地质力学数据，暴露的岩心和相关未反应的对照样品，以评估矿物溶解后CO2储存复合体中储层和密封岩石的机械稳定性，几千年的沉淀。所获得的力学参数耦合到矿物学和孔隙度。这项工作的主要目的是更好地量化长期化学CO2/盐水/岩石相互作用对所研究地层的机械强度和弹性性能的影响。
Understanding the long-term response of CO2injected into porous reservoirs is one of the most important aspects to demonstrate safe and permanent storage. In order to provide quantitative constraints on the long-term impacts of CO2-charged fluids on the integrity of reservoir-caprock systems we recovered some 300m of core from a scientific drill hole through a natural CO2reservoir, near Green River, Utah. We obtained geomechanical, mineralogical, geochemical, petrophysical and mineralogical laboratory data along the entire length of the core and from non CO2-charged control samples. Furthermore, we performed more detailed studies through portions of low permeability layers in direct contact with CO2-charged layers. This was done to constrain the nature and penetration depths of CO2-promoted fluid-mineral reaction fronts. The major reactions identified include the dissolution of diagenetic dolomite cements and hematite grain coatings, and the precipitation of ankerite and pyrite and have been used as input for geochemical 1D reactive transport modelling, to constrain the magnitude and velocity of the mineral-fluid reaction front.In addition, we compared geomechanical data from the CO2-exposed core and related unreacted control samples to assess the mechanical stability of reservoir and seal rocks in a CO2storage complex following mineral dissolution and precipitation for thousands of years. The obtained mechanical parameters were coupled to mineralogy and porosity. Key aim of this work was to better quantify the effect of long-term chemical CO2/brine/rock interactions on the mechanical strength and elastic properties of the studied formations.