Modelling the Bohemian Earthquake Swarms: Application of a poro-thermo-elastic plastic model with weakening, damage and multiphase flow in GPU

波希米亚地震群建模：具有弱化、损伤和多相流的多孔热弹塑性模型在 GPU 中的应用

基本信息

批准号：
235293516
负责人：
Professor Dr. Stephen A. Miller
金额：
--
依托单位：
Institut de Géologie et dHydrogéologie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/235293516?language=en
关键词：
Modelling Bohemian Earthquake Swarms Application

项目摘要

We propose to apply a newly developed model to numerically investigate earthquake swarms in general and the Bohemian swarms in particular. The model simulates a pore-elastic plastic rheology coupled with a non-linear diffusion model for pressure propagation, where the nonlinearity arises through the effective stress-dependence of the permeability. A two-phase (water and gas) flow model is currently being implemented. Numerical cracks in the model nucleate and grow in response to; i) far-field stresses developed at the boundaries, ii) stress perturbations arising from internal crack growth, and iii) poro-elastic stressing. Recent developments that include hardening, softening, and a damage growth model reproduce the entire (load-failure-unload) stress-strain curve observed in laboratory rock experiments. In this project, we propose to: 1) Include a heat flow model and introduce thermo-elasticity; 2) extend the model to 3-dimensions, 3) implement the model on the Graphics Processing Unit (GPU) platform, and 4) apply the model to the Bohemian swarms. The GPU platform allows fast and very high-resolution simulations in comparison to the standard CPU architecture. The numerical model is ideally suited to study the Bohemian swarms because the dominant physics of the Bohemian earthquake swarms are simulated, namely the complex interactions and feedbacks of CO2 injection, seismic slip (with the concomitant permeability enhancement) fluid flow, and advective heat flow. The model will be used to address: a) triggering mechanisms that generate swarm-earthquake activity, b) characterize fault-related fluid transport processes and effects of the fluid/rock interaction during migration, and c) investigate the system’s dependence on pressure and temperature.

我们建议应用新开发的模型来数值研究一般地震群，特别是波希米亚地震群。该模型模拟了孔隙弹性塑性流变学以及压力传播的非线性扩散模型，其中非线性是通过有效值产生的。目前正在实施模型中的两相（水和气体）流动模型，并根据 i) 进行扩展。边界处产生的远场应力，ii) 内部裂纹扩展引起的应力扰动，以及 iii) 多孔弹性应力，包括硬化、软化和损伤增长模型再现了整个过程（加载-失效-卸载）。在实验室岩石实验中观察到的应力-应变曲线，我们建议：1）包括热流模型并引入热弹性；2）将模型扩展到三维，3）实施模型。 4) 将模型应用于波希米亚群。与标准 CPU 架构相比，GPU 平台允许进行快速且分辨率非常高的模拟。该数值模型非常适合研究波希米亚群。因为模拟了波西米亚地震群的主要物理现象，即二氧化碳注入、地震滑移（伴随渗透性增强）流体流动的复杂相互作用和反馈，以及该模型将用于解决：a）产生群地震活动的触发机制，b）表征与断层相关的流体输送过程以及运移过程中流体/岩石相互作用的影响，以及c）研究系统的依赖性关于压力和温度。