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.

裂纹控制地壳中的流体流动 - 这对于产生碳氢化合物，计划地下废物存储和理解地震至关重要。破裂的岩石的强度或劣势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，在带有球体填充毛孔的岩石中，孔隙压力的变化在各个方向都同样感受到。这被称为各向同性毛弹性。但是，已知裂缝的岩石包含狭窄裂纹的阵列，其中许多裂纹沿相似的方向定向。这表明，孔隙压力的变化不会 *在各个方向上平均感觉到，并且通过各向异性毛弹性的理论描述了这一点。该项目旨在检验各向异性孔隙弹性的假设：主要是，流体饱和岩石中应力的变化取决于该岩石中裂纹的模式。迄今为止，基于变形岩石的测量数据，还没有对该理论进行系统的评估。该项目将收集有关裂缝岩石裂纹模式的定量数据，然后预测压力变化的压力变化。这些预测将与常用的各向同性病例进行比较，并将量化差异。该提案中描述的研究将显着改善我们的机械骨折岩石机械模型，从而更有效地管理地下资源，并更好地评估地震危害和废物设施故障的风险。

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

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

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.