Chemo-mechanical Alteration of Silicate-Rich Shale Rock after Exposure to CO2-Rich Brine at High Temperature and Pressure
Chemo-mechanical Alteration of Silicate-Rich Shale Rock after Exposure to CO2-Rich Brine at High Temperature and Pressure
复制标题
高温高压下富含二氧化碳盐水暴露后富含硅酸盐页岩的化学机械蚀变
DOI：
10.1007/s00603-023-03664-x
复制
发表时间：
2023
影响因子：
6.2
通讯作者：
Abedi, Sara
中科院分区：
文献类型：
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作者：
Prakash, Ravi;Mahgoub, Samah A.;Abedi, Sara
由于它们在岩石风化中的应用涉及地质构造稳定性、强化地热系统、碳封存和提高采收率，因此岩石-卤水-二氧化碳相互作用对岩石微观结构和力学性质的影响已成为一个热门话题。了解化学、微结构和机械过程之间的相互作用对于理解它们如何影响岩石机械蚀变是至关重要的。在这项研究中，我们研究了化学机械载荷对岩石中个别成分的微结构特征和力学变化的影响。实验涉及将二叠纪岩石样品暴露在温度和压力分别为100摄氏度和1800磅/平方英寸的富含二氧化碳或氮气的盐水中(一种控制条件)，持续不同的时间(14天和28天)。用氯化钠将溶液的离子强度调节到1M。Micro-CT图像分析表明，富粘土和富石英相溶解后析出。14天后，外层反应区深度达到约1100微米，28天后，深度增加到1500微米。微观力学分析表明，与富含CO2的卤水反应后，富粘土和富石英相的压痕模数降低。对于富石英相，在28天的反应中，压痕模数的下降幅度超过50%，并且在反应表面附近较低。由于孔径受控的溶解现象，在与富含CO2的盐水反应14天后，力学性能的下降在距离反应表面400-600微米的地方更加明显。在离反应表面较远的地方(约5 mm)进行的实验表明，粘土-石英界面较弱，可能是由于粘土颗粒膨胀引起的微裂缝的形成。N2条件下的结果显示，岩石成分的表面机械变化限于距离反应表面200微米的深度。
Owing to their application in rock weathering concerning geostructural stability, enhanced geothermal systems, carbon sequestration, and enhanced oil recovery, the effect of rock–brine–CO2interactions on the microstructural and mechanical properties of rocks has become a prevalent topic. Understanding the interplay among chemical, microstructural, and mechanical processes is essential to comprehend how they affect rock mechanical alteration. In this study, we examined the effects of chemo-mechanical loading on the microstructural features and mechanical alterations of individual components within the rock. Experiments involved exposing the Permian rock samples to either CO2or N2-rich brine (a control condition) at a temperature and pressure of 100 °C and 1800 Psi, respectively, for varying duration (14 and 28 days). The ionic strength of the solution was adjusted to 1 M using NaCl. Micro-CT image analysis showed the dissolution of clay- and quartz-rich phases followed by their precipitation. After 14 days, the depth of the outer reacted zone reached roughly 1100 µm, and after 28 days, the depth increased to 1500 µm. Microscale mechanical analysis showed decreased indentation modulus of the clay- and quartz-rich phases after reacting with CO2-rich brine. This decrease in indentation modulus was more than 50% for quartz-rich phases for 28 days of reaction and was lower adjacent to the reacted surface. The decrease in mechanical properties was more pronounced at a distance of 400–600 µm from the reacted surface after 14 days of reaction with CO2-rich brine due to the pore-size controlled solubility phenomenon. Experiments conducted at a greater distance from the reacted surface (approximately 5 mm) revealed a weaker clay–quartz interface, possibly due to the formation of microcracks induced by the swelling of clay particles. Results for the N2condition show a superficial mechanical alteration of the rock constituents limited to a depth of 200 µm from the reacted surface.
影响因子：
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作者：
R. Prakash;Pierre Christian Kana Nguene;A. Noshadravan;S. Abedi
通讯作者：
R. Prakash;Pierre Christian Kana Nguene;A. Noshadravan;S. Abedi
由于有机化合物络合，石英在水中的溶解度增加
影响因子：
64.8
作者：
Philip C. Bennett;Donald I. Siegel
通讯作者：
Donald I. Siegel