Transport efficiency and dynamics of hydraulic fracture networks
Intermittent fluid pulses in the Earth's crust can explain a variety of geological phenomena, for instance the occurrence of hydraulic breccia. Fluid transport in the crust is usually modeled as continuous Darcian flow, ignoring that sufficient fluid overpressure can cause hydraulic fractures a...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/138039 |
| Acceso en línea: | https://hdl.handle.net/2445/138039 |
| Access Level: | acceso abierto |
| Palabra clave: | Fracturació hidràulica Mecànica de roques Hydraulic fracturing Rock mechanics |
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Transport efficiency and dynamics of hydraulic fracture networksSachau, TillBons, Paul D.Gómez Rivas, EnriqueFracturació hidràulicaMecànica de roquesHydraulic fracturingRock mechanicsIntermittent fluid pulses in the Earth's crust can explain a variety of geological phenomena, for instance the occurrence of hydraulic breccia. Fluid transport in the crust is usually modeled as continuous Darcian flow, ignoring that sufficient fluid overpressure can cause hydraulic fractures as fluid pathways with very dynamic behavior. Resulting hydraulic fracture networks are largely self-organized: opening and healing of hydraulic fractures depends on local fluid pressure, which is, in turn, largely controlled by the fracture network. We develop a crustal-scale 2D computer model designed to simulate this process. To focus on the dynamics of the process we chose a setup as simple as possible. Control factors are constant overpressure at a basal fluid source and a constant "viscous" parameter controlling fracture-healing. Our results indicate that at large healing rates hydraulic fractures are mobile, transporting fluid in intermittent pulses to the surface and displaying a 1/fα behavior. Low healing rates result in stable networks and constant flow. The efficiency of the fluid transport is independent from the closure dynamics of veins or fractures. More important than preexisting fracture networks is the distribution of fluid pressure. A key requirement for dynamic fracture networks is the presence of a fluid pressure gradient.Frontiers Media2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/138039Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.3389/fphy.2015.00063Frontiers in Physics, 2015, vol. 3, num. 63, p. 1-13https://doi.org/10.3389/fphy.2015.00063cc-by (c) Sachau, Till et al., 2015http://creativecommons.org/licenses/by/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1380392026-05-27T06:46:51Z |
| dc.title.none.fl_str_mv |
Transport efficiency and dynamics of hydraulic fracture networks |
| title |
Transport efficiency and dynamics of hydraulic fracture networks |
| spellingShingle |
Transport efficiency and dynamics of hydraulic fracture networks Sachau, Till Fracturació hidràulica Mecànica de roques Hydraulic fracturing Rock mechanics |
| title_short |
Transport efficiency and dynamics of hydraulic fracture networks |
| title_full |
Transport efficiency and dynamics of hydraulic fracture networks |
| title_fullStr |
Transport efficiency and dynamics of hydraulic fracture networks |
| title_full_unstemmed |
Transport efficiency and dynamics of hydraulic fracture networks |
| title_sort |
Transport efficiency and dynamics of hydraulic fracture networks |
| dc.creator.none.fl_str_mv |
Sachau, Till Bons, Paul D. Gómez Rivas, Enrique |
| author |
Sachau, Till |
| author_facet |
Sachau, Till Bons, Paul D. Gómez Rivas, Enrique |
| author_role |
author |
| author2 |
Bons, Paul D. Gómez Rivas, Enrique |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
Fracturació hidràulica Mecànica de roques Hydraulic fracturing Rock mechanics |
| topic |
Fracturació hidràulica Mecànica de roques Hydraulic fracturing Rock mechanics |
| description |
Intermittent fluid pulses in the Earth's crust can explain a variety of geological phenomena, for instance the occurrence of hydraulic breccia. Fluid transport in the crust is usually modeled as continuous Darcian flow, ignoring that sufficient fluid overpressure can cause hydraulic fractures as fluid pathways with very dynamic behavior. Resulting hydraulic fracture networks are largely self-organized: opening and healing of hydraulic fractures depends on local fluid pressure, which is, in turn, largely controlled by the fracture network. We develop a crustal-scale 2D computer model designed to simulate this process. To focus on the dynamics of the process we chose a setup as simple as possible. Control factors are constant overpressure at a basal fluid source and a constant "viscous" parameter controlling fracture-healing. Our results indicate that at large healing rates hydraulic fractures are mobile, transporting fluid in intermittent pulses to the surface and displaying a 1/fα behavior. Low healing rates result in stable networks and constant flow. The efficiency of the fluid transport is independent from the closure dynamics of veins or fractures. More important than preexisting fracture networks is the distribution of fluid pressure. A key requirement for dynamic fracture networks is the presence of a fluid pressure gradient. |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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https://hdl.handle.net/2445/138039 |
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https://hdl.handle.net/2445/138039 |
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Inglés |
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Inglés |
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Reproducció del document publicat a: https://doi.org/10.3389/fphy.2015.00063 Frontiers in Physics, 2015, vol. 3, num. 63, p. 1-13 https://doi.org/10.3389/fphy.2015.00063 |
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cc-by (c) Sachau, Till et al., 2015 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess |
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cc-by (c) Sachau, Till et al., 2015 http://creativecommons.org/licenses/by/3.0/es |
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openAccess |
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application/pdf |
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Frontiers Media |
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Frontiers Media |
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Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona |
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Universidad de Barcelona |
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Dipòsit Digital de la UB |
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Dipòsit Digital de la UB |
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15,300719 |