Quantifying Patterns of Brittle Damage in Fractured Rock

断裂岩石脆性损伤的量化模式

• 批准号: NE/I001743/1
• 负责人: David Healy
• 金额: $ 7.23万
• 依托单位: University of Aberdeen
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FI001743%2F1
• 关键词: Quantifying; Patterns; Brittle; Damage; Fractured

Cracks control the flow of fluids in the Earth's crust - this is critical for producing hydrocarbons, for planning subsurface waste storage and for understanding earthquakes. The strength or weakness of fractured rock depends on the pressure of the fluid in the cracks and the pattern of those cracks. In the simplest case, in a rock with spherical fluid-filled pores, changes in pore fluid pressure are felt equally in all directions. This is known as isotropic poroelasticity. However, fractured rocks are known to contain arrays of narrow cracks, many of which are oriented in a similar direction. This suggests that changes in pore fluid pressure will *not* be felt equally in all directions, and this has been described by a theory of anisotropic poroelasticity. This project aims to test the hypothesis of anisotropic poroelasticity: chiefly, that changes in stress in a fluid saturated rock depend on the pattern of cracks in that rock. To date, there has been no systematic assessment of this theory based on measured data from deformed rocks. This project will collect quantitative data on crack patterns from fractured rocks and then predict changes in stress with changes in fluid pressure. These predictions will be compared to the commonly used isotropic case, and the discrepancy will be quantified. The research described in this proposal will significantly improve our mechanical models of fluid-saturated fractured rock, leading to more efficient management of subsurface resources and better assessment of seismic hazards and risks of waste facility failure.

裂缝控制着地壳中的流体流动——这对于生产碳氢化合物、规划地下废物储存和了解地震至关重要。裂隙岩石的强度或弱点取决于裂缝中流体的压力以及这些裂缝的模式。在最简单的情况下，在具有球形流体填充孔隙的岩石中，在所有方向上均等地感受到孔隙流体压力的变化。这称为各向同性孔隙弹性。然而，已知裂隙岩石含有一系列狭窄的裂缝，其中许多裂缝的方向相似。这表明，在所有方向上，孔隙流体压力的变化*不会*被同等地感受到，并且这已通过各向异性孔隙弹性理论进行了描述。该项目旨在测试各向异性孔隙弹性的假设：主要是流体饱和岩石中的应力变化取决于该岩石中的裂缝模式。迄今为止，还没有根据变形岩石的测量数据对该理论进行系统评估。该项目将收集裂隙岩石裂纹模式的定量数据，然后预测应力随流体压力变化的变化。这些预测将与常用的各向同性情况进行比较，并对差异进行量化。该提案中描述的研究将显着改进我们的流体饱和裂隙岩石的力学模型，从而更有效地管理地下资源，更好地评估地震危害和废物处理设施故障的风险。

项目成果

Polymodal faulting: Time for a new angle on shear failure

• DOI: 10.1016/j.jsg.2015.08.013
• 发表时间: 2015-11-01
• 期刊: JOURNAL OF STRUCTURAL GEOLOGY
• 影响因子: 3.1
• 作者: Healy, David;Blenkinsop, Thomas G.;Cooke, Michele L.
• 通讯作者: Cooke, Michele L.

FracPaQ: A MATLAB™ toolbox for the quantification of fracture patterns

• DOI: 10.1016/j.jsg.2016.12.003
• 发表时间: 2016-12
• 期刊: Journal of Structural Geology
• 影响因子: 3.1
• 作者: D. Healy;R. Rizzo;D. Cornwell;N. Farrell;Hannah Watkins;N. Timms;E. Gomez‐Rivas;Michael C. Smith-Michael-C.-Sm

Anisotropy of permeability in faulted porous sandstones

• DOI: 10.1016/j.jsg.2014.02.008
• 发表时间: 2014-06-01
• 期刊: JOURNAL OF STRUCTURAL GEOLOGY
• 影响因子: 3.1
• 作者: Farrell, N. J. C.;Healy, D.;Taylor, C. W.
• 通讯作者: Taylor, C. W.

Benefits of maximum likelihood estimators for fracture attribute analysis: Implications for permeability and up-scaling

最大似然估计器在裂缝属性分析中的优势：对渗透率和尺度放大的影响

• DOI: 10.1016/j.jsg.2016.12.005
• 发表时间: 2017
• 期刊: Journal of Structural Geology
• 影响因子: 3.1
• 作者: Rizzo R