Hydrogeochemical Modeling to Identify Potential Risks of Underground Hydrogen Storage in Depleted Gas Fields
Hydrogeochemical Modeling to Identify Potential Risks of Underground Hydrogen Storage in Depleted Gas Fields
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DOI：
10.3390/app8112282
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发表时间：
2018-11-01
影响因子：
2.7
通讯作者：
van Berk, Wolfgang
中科院分区：
文献类型：
--
作者：
Hemme, Christina;van Berk, Wolfgang
地下储氢是平衡可再生能源能源生产季节性波动的一种潜在方法。枯竭气田储氢的风险包括微生物活动导致氢气转化为CH4(g)和H2S(g)，储层和盖层中气-水-岩相互作用（与孔隙度变化有关），以及水态氢通过盖层盐水扩散损失。这些风险会导致氢气的损失，从而导致能量的损失。开发了一种水文地球化学建模方法来分析这些风险，并了解储层尺度下储氢随储存时间变化的基本水文地球化学机制。一维扩散质量输运模型是基于气-水-岩相互作用的平衡反应和硫酸盐还原和产甲烷的动力学反应。建模代码为PHREEQC （pH-REdox-EQuilibrium，用C语言编写）。确定了影响氢损失的参数。关键参数是可用电子受体的数量、储存时间和动力学速率常数。储氢使储层岩石孔隙度略有降低。水中氢的扩散损失很小。确定了枯竭气田储氢优化的广泛条件。
Underground hydrogen storage is a potential way to balance seasonal fluctuations in energy production from renewable energies. The risks of hydrogen storage in depleted gas fields include the conversion of hydrogen to CH4(g) and H2S(g) due to microbial activity, gas-water-rock interactions in the reservoir and cap rock, which are connected with porosity changes, and the loss of aqueous hydrogen by diffusion through the cap rock brine. These risks lead to loss of hydrogen and thus to a loss of energy. A hydrogeochemical modeling approach is developed to analyze these risks and to understand the basic hydrogeochemical mechanisms of hydrogen storage over storage times at the reservoir scale. The one-dimensional diffusive mass transport model is based on equilibrium reactions for gas-water-rock interactions and kinetic reactions for sulfate reduction and methanogenesis. The modeling code is PHREEQC (pH-REdox-EQuilibrium written in the C programming language). The parameters that influence the hydrogen loss are identified. Crucial parameters are the amount of available electron acceptors, the storage time, and the kinetic rate constants. Hydrogen storage causes a slight decrease in porosity of the reservoir rock. Loss of aqueous hydrogen by diffusion is minimal. A wide range of conditions for optimized hydrogen storage in depleted gas fields is identified.