Burtonshaw J E J, Paluszny A, Mohammadpour A, Zimmerman R W
Department of Earth Science and Engineering, Imperial College London, London, UK.
Philos Trans A Math Phys Eng Sci. 2024 Aug 9;382(2276):20230187. doi: 10.1098/rsta.2023.0187. Epub 2024 Jul 1.
The intermittent storage of hydrogen in subsurface porous media such as depleted gas fields could be pivotal to a successful energy transition. Numerical simulations investigate the intermittent storage of hydrogen in a porous, depleted subsurface reservoir. Various parametric studies are performed to assess the effect of mechanical properties of the reservoir (i.e. Young's modulus, Poisson's ratio, Biot coefficient and permeability) on the induced fault slip of a single through-going fault that transverses the entire reservoir. Simulations are run using a three-dimensional, finite element, fully coupled hydromechanical code with explicit representations of layers and faults. The effect of the domain mesh refinement and fault mesh refinement on the fault slip versus operation time solution is investigated. The fault is observed to slip in two distinct events, one during the second injection period and one in the third injection period. The fault is not observed to slip during the storage or withdrawal periods. It is found that in order to minimize seismic risk, a reservoir rock with high Young's modulus (>40 GPa), high Poisson's ratio (>0.30) and high Biot coefficient (>0.65) would be preferable for hydrogen storage. Reservoir rocks of low Young's modulus (10-30 GPa), intermediate Poisson's ratio (0.00-0.30) and low-to-intermediate Biot coefficient (0.25-0.65), at high injection rates, were found to have higher potential of inducing large seismic events.This article is part of the theme issue 'Induced seismicity in coupled subsurface systems'.
将氢气间歇性存储于诸如枯竭气田等地下多孔介质中，可能是能源成功转型的关键所在。数值模拟研究了氢气在多孔、枯竭地下储层中的间歇性存储情况。开展了各种参数研究，以评估储层力学性质（即杨氏模量、泊松比、比奥系数和渗透率）对一条贯穿整个储层的单一贯通断层诱发断层滑动的影响。模拟使用三维有限元全耦合流体力学代码进行，明确表示了地层和断层。研究了区域网格细化和断层网格细化对断层滑动与运行时间解的影响。观察到断层在两个不同事件中发生滑动，一次在第二次注入期，一次在第三次注入期。在存储或采出期未观察到断层滑动。研究发现，为使地震风险降至最低，对于氢气存储而言，具有高杨氏模量（>40 GPa）、高泊松比（>0.30）和高比奥系数（>0.65）的储层岩石更为可取。研究发现，低杨氏模量（10 - 30 GPa）、中等泊松比（0.00 - 0.30）以及低至中等比奥系数（0.25 - 0.65）的储层岩石，在高注入速率下，诱发大地震事件的可能性更高。本文是“地下耦合系统中的诱发地震活动”主题特刊的一部分。
