Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport
This paper describes the properties of faults and fractures in the Upper Cretaceous Chatsworth Formation exposed at Santa Susana Field Laboratory and its surroundings (Simi Hills, California), where groundwater flow and contamination have been studied for over three decades.The complex depositional...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v85_n_p95_Cilona http://hdl.handle.net/20.500.12110/paper_01918141_v85_n_p95_Cilona |
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paper:paper_01918141_v85_n_p95_Cilona2023-06-08T15:19:55Z Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport Fault zone hierarchy Fluid flow Fracture attributes Fracture dimensional parameters Joint zones Boreholes Complex networks Flow of fluids Fracture Groundwater Groundwater flow Hydraulic conductivity Lithology Network architecture Sandstone Shale Dimensional parameters Fault zone Fracture attributes Groundwater flow and contaminant transports Horizontal hydraulic conductivities Joint zone Statistical characterization Structural characterization Groundwater pollution fault zone fluid flow fracture groundwater flow joint pollutant transport sandstone shale turbidite California United States This paper describes the properties of faults and fractures in the Upper Cretaceous Chatsworth Formation exposed at Santa Susana Field Laboratory and its surroundings (Simi Hills, California), where groundwater flow and contamination have been studied for over three decades.The complex depositional architecture of this turbidite consisting of alternating sandstones and shales, interacting with formative stress conditions are responsible for multi-scale fault hierarchies and permeable fractures in which nearly all groundwater flow occurs.Intensity and distribution of background fractures and their relation to bedding thickness are established for sandstones, the dominant lithology. The architecture of faults with increasing displacement is described, and relationships among fault dimensional parameters captured.Data from 400 boreholes and piezometers reveal the effect of faults and fractures on groundwater flow. Large hydraulic head differences, observed across fault zones with shale-rich cores, indicate these structures as cross-flow barriers. Moreover, hydraulic head profiles under ambient conditions, and pumping tests suggest strong hydraulic connectivity in all directions to depth of hundreds of meters.This outcrop-based structural characterization relates the horizontal hydraulic conductivity to the observed well-connected fracture network, and explains the strong vertical connectivity across low-hydraulic conductivity shales as faults and sheared fractures provide flow pathways. © 2016 The Authors. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v85_n_p95_Cilona http://hdl.handle.net/20.500.12110/paper_01918141_v85_n_p95_Cilona |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Fault zone hierarchy Fluid flow Fracture attributes Fracture dimensional parameters Joint zones Boreholes Complex networks Flow of fluids Fracture Groundwater Groundwater flow Hydraulic conductivity Lithology Network architecture Sandstone Shale Dimensional parameters Fault zone Fracture attributes Groundwater flow and contaminant transports Horizontal hydraulic conductivities Joint zone Statistical characterization Structural characterization Groundwater pollution fault zone fluid flow fracture groundwater flow joint pollutant transport sandstone shale turbidite California United States |
| spellingShingle |
Fault zone hierarchy Fluid flow Fracture attributes Fracture dimensional parameters Joint zones Boreholes Complex networks Flow of fluids Fracture Groundwater Groundwater flow Hydraulic conductivity Lithology Network architecture Sandstone Shale Dimensional parameters Fault zone Fracture attributes Groundwater flow and contaminant transports Horizontal hydraulic conductivities Joint zone Statistical characterization Structural characterization Groundwater pollution fault zone fluid flow fracture groundwater flow joint pollutant transport sandstone shale turbidite California United States Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport |
| topic_facet |
Fault zone hierarchy Fluid flow Fracture attributes Fracture dimensional parameters Joint zones Boreholes Complex networks Flow of fluids Fracture Groundwater Groundwater flow Hydraulic conductivity Lithology Network architecture Sandstone Shale Dimensional parameters Fault zone Fracture attributes Groundwater flow and contaminant transports Horizontal hydraulic conductivities Joint zone Statistical characterization Structural characterization Groundwater pollution fault zone fluid flow fracture groundwater flow joint pollutant transport sandstone shale turbidite California United States |
| description |
This paper describes the properties of faults and fractures in the Upper Cretaceous Chatsworth Formation exposed at Santa Susana Field Laboratory and its surroundings (Simi Hills, California), where groundwater flow and contamination have been studied for over three decades.The complex depositional architecture of this turbidite consisting of alternating sandstones and shales, interacting with formative stress conditions are responsible for multi-scale fault hierarchies and permeable fractures in which nearly all groundwater flow occurs.Intensity and distribution of background fractures and their relation to bedding thickness are established for sandstones, the dominant lithology. The architecture of faults with increasing displacement is described, and relationships among fault dimensional parameters captured.Data from 400 boreholes and piezometers reveal the effect of faults and fractures on groundwater flow. Large hydraulic head differences, observed across fault zones with shale-rich cores, indicate these structures as cross-flow barriers. Moreover, hydraulic head profiles under ambient conditions, and pumping tests suggest strong hydraulic connectivity in all directions to depth of hundreds of meters.This outcrop-based structural characterization relates the horizontal hydraulic conductivity to the observed well-connected fracture network, and explains the strong vertical connectivity across low-hydraulic conductivity shales as faults and sheared fractures provide flow pathways. © 2016 The Authors. |
| title |
Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport |
| title_short |
Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport |
| title_full |
Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport |
| title_fullStr |
Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport |
| title_full_unstemmed |
Structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the Santa Susana Field Laboratory: Implications for their effects on groundwater flow and contaminant transport |
| title_sort |
structural and statistical characterization of joints and multi-scale faults in an alternating sandstone and shale turbidite sequence at the santa susana field laboratory: implications for their effects on groundwater flow and contaminant transport |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v85_n_p95_Cilona http://hdl.handle.net/20.500.12110/paper_01918141_v85_n_p95_Cilona |
| _version_ |
1768545415064453120 |