Pressure Buildup and Brine Migration During CO2 Storage in Multilayered Aquifers
Pressure Buildup and Brine Migration During CO2 Storage in Multilayered Aquifers
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DOI：
10.1111/j.1745-6584.2012.00972.x
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发表时间：
2012-08
期刊：
影响因子：
2.6
通讯作者：
A. Cihan;J. Birkholzer;Quanlin Zhou
中科院分区：
文献类型：
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作者：
A. Cihan;J. Birkholzer;Quanlin Zhou
将二氧化碳注入深层盐水地层可能导致大规模压力升高和原生流体迁移。局部高传导性特征，如不当废弃的威尔斯井或传导性断层，可能成为盐水集中泄漏到浅层地下水资源的管道。由于低渗透性弱透水层的扩散泄漏，加压盐水也可能被推入上覆/下伏地层中，这发生在大面积上，并可能允许储层中的有效压力泄放。这项研究提出了一个最近开发的分析解决方案的压力恢复和泄漏率在多层含水层弱透水层系统集中和分散的盐水泄漏的应用。通过与考虑两相流细节的数值模拟研究进行比较，验证了该单相解析解估计远场流过程的准确性。然后，我们提出了几个示例应用程序的假设CO2注入的情况下（不考虑两相流），以证明新的解决方案是一个有效的工具，用于分析区域的压力建立在一个多层系统，以及获得洞察的泄漏过程的流动通过弱透水层，泄漏威尔斯，和/或泄漏故障。当需要执行大量计算时，即不确定性量化、参数估计或压力管理方案优化时，该解决方案可能特别有用。
Carbon dioxide injection into deep saline formations may induce large‐scale pressure increases and migration of native fluid. Local high‐conductivity features, such as improperly abandoned wells or conductive faults, could act as conduits for focused leakage of brine into shallow groundwater resources. Pressurized brine can also be pushed into overlying/underlying formations because of diffuse leakage through low‐permeability aquitards, which occur over large areas and may allow for effective pressure bleed‐off in the storage reservoirs. This study presents the application of a recently developed analytical solution for pressure buildup and leakage rates in a multilayered aquifer‐aquitard system with focused and diffuse brine leakage. The accuracy of this single‐phase analytical solution for estimating far‐field flow processes is verified by comparison with a numerical simulation study that considers the details of two‐phase flow. We then present several example applications for a hypothetical CO2 injection scenario (without consideration of two‐phase flow) to demonstrate that the new solution is an efficient tool for analyzing regional pressure buildup in a multilayered system, as well as for gaining insights into the leakage processes of flow through aquitards, leaky wells, and/or leaky faults. This solution may be particularly useful when a large number of calculations needs to be performed, that is, for uncertainty quantification, for parameter estimation, or for the optimization of pressure‐management schemes.