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| DOI | 10.1016/j.tecto.2021.228873 |
| Quantitative anisotropies of palaeopermeability in a strike-slip fault damage zone: Insights from micro-CT analysis and numerical simulations | |
| Gomila R.; Arancibia G.; Nehler M.; Bracke R.; Morata D.; Cembrano J. | |
| 发表日期 | 2021 |
| ISSN | 00401951 |
| 卷号 | 810 |
| 英文摘要 | Fracturing and damage around faults related to seismogenesis can enhance hydrothermal fluid percolation, causing mineral precipitation. This study uses hydrothermally sealed microfractures across an ancient exhumed fault to unravel the 3D-spatial distribution of fault damage and related anisotropy in permeability. We studied the fault damage zone of the Jorgillo Fault, a left-lateral strike-slip fault, exposed by ca. 20 km in the Atacama Fault System, northern Chile. The study was conducted by addressing the 3D-spatial distribution of the microfracture network through X-ray micro-computed tomography and palaeopermeability modeling using a computational fluid dynamic approach, thus assessing mm-scale fault-related permeability tensors. 3D modeled fault-directed permeability ellipsoids on both sides of the fault core are transverse anisotropic, where palaeopermeability (matrix permeability) in the fault-parallel plane is higher than across-strike of the Jorgillo Fault (2.4 and 1.9 times in the eastern and western block of the fault, respectively). Modeled 3D permeability values (ca. 10−11 to 10−15 m2) show a mean overestimation factor of 8.4 of the estimated 2D permeability (ca. 10−9 to 10−12 m2). Permeability anisotropy distribution in the damage zone is related to off-fault damage generation, and could be explained by tip propagation fault growth and dynamic rupture due to earthquakes under the fault-valve mechanism. Whereas the fault would act as an impermeable seal except for post-failure, when it became highly permeable for fluids. © 2021 Elsevier B.V. |
| 关键词 | 3D Permeability modelingFault zone palaeopermeabilityLattice-Boltzmann methodPermeability anisotropyX-Ray micro-computed tomography |
| 英文关键词 | Anisotropy; Computational fluid dynamics; Computerized tomography; Solvents; Spatial distribution; Strike-slip faults; Structural geology; Fault damage zone; Hydrothermal fluids; Matrix permeability; Mineral precipitation; Off-fault damage; Permeability anisotropy; Permeability tensors; X ray micro-computed tomography; Fault slips; computational fluid dynamics; damage; fault propagation; fracture; hydrothermal fluid; lattice dynamics; permeability; quantitative analysis; seismic anisotropy; spatial distribution; strike-slip fault; Atacama; Chile; Atacama |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207979 |
| 作者单位 | Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago (Postal Code 7820436), Chile; Andean Geothermal Centre of Excellence (CEGA, FONDAP-CONICYT), Santiago, Chile; Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy; GZB - International Geothermal Centre, Bochum, Germany; Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Gomila R.,Arancibia G.,Nehler M.,et al. Quantitative anisotropies of palaeopermeability in a strike-slip fault damage zone: Insights from micro-CT analysis and numerical simulations[J],2021,810. |
| APA | Gomila R.,Arancibia G.,Nehler M.,Bracke R.,Morata D.,&Cembrano J..(2021).Quantitative anisotropies of palaeopermeability in a strike-slip fault damage zone: Insights from micro-CT analysis and numerical simulations.Tectonophysics,810. |
| MLA | Gomila R.,et al."Quantitative anisotropies of palaeopermeability in a strike-slip fault damage zone: Insights from micro-CT analysis and numerical simulations".Tectonophysics 810(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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