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.

我们建议将新开发的模型应用于一般的数字投资地震群，尤其是波西米亚群。该模型模拟了孔隙弹性塑料流变学，并与非线性扩散模型结合进行压力传播，其中非线性通过渗透率的有效应力依赖性而产生。目前正在实施两相（水和气体）流量模型。模型核中的数值裂纹并响应于响应； i）在边界上产生的远场应力，ii）由内部裂纹生长引起的应力扰动，iii）孔隙弹性应激。最近的发展包括硬化，软化和损伤生长模型在实验室岩石实验中观察到的整个（负载 - 失败）应力应变曲线。在这个项目中，我们建议：1）包括热流模型并引入热弹性； 2）将模型扩展到3维，3）在图形处理单元（GPU）平台上实现模型，4）将模型应用于Bohemian群。与标准CPU架构相比，GPU平台允许快速且非常高分辨率的模拟。数值模型非常适合研究波西米亚群体，因为波西米亚地震群的主要物理是模拟的，即二氧化碳注射，地震滑移的复杂相互作用和反馈（随附的通透性增强性增强）流体流动和高级热流。该模型将用于解决：a）触发产生群 - 电子活动的机制，b）表征与断层相关的流体运输过程以及迁移过程中流体/岩石相互作用的影响，c）研究系统对压力和温度的依赖性。