Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)

Horizontal stress directions have been determined in the southernmost flat-slab boundary Andean retroarc between 32°44' and 33°40'S within Cuyo Basin, Argentina. These directions were obtained from the borehole breakout analysis of 42 wells using four-arm caliper data. The mean maximum hor...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Guzmán, C.G., Cristallini, E.O.
Formato: JOUR
Materias:
borehole breakout
data interpretation
plate boundary
stress field
stress measurement
Argentina
Cuyo Basin
Neuquen Basin
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_21699313_v114_n2_p_Guzman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_21699313_v114_n2_p_Guzman
record_format dspace
spelling todo:paper_21699313_v114_n2_p_Guzman2023-10-03T16:39:57Z Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S) Guzmán, C.G. Cristallini, E.O. borehole breakout data interpretation plate boundary stress field stress measurement Argentina Cuyo Basin Neuquen Basin South America Horizontal stress directions have been determined in the southernmost flat-slab boundary Andean retroarc between 32°44' and 33°40'S within Cuyo Basin, Argentina. These directions were obtained from the borehole breakout analysis of 42 wells using four-arm caliper data. The mean maximum horizontal stress (SHmax) direction for the whole region is 104.1° with a 95% confidence interval of 8.1°. The present-day stress field has an approximately preferred E-W trend maximum horizontal stress direction, consistent with the plate boundary forces (80°) and the topographic forces (near E-W). The calculated SHmax directions are near the expected values, but some local deviations were observed. The SHmax rotates from an E-W orientation in the south to a NW-SE orientation to the north of this sector of the Andean retroarc. A regional variation in the stress field can be observed when these results for the Cuyo Basin are analyzed together with those presented in a previous study in the Neuquen Basin to the south. The maximum horizontal stress varies from ̃NW-NE along this combined section of the Andean retroarc, with the ̃E-W SHmax directions in the northern Neuquen Basin consistent with those observed in the southern sector of Cuyo Basin. These variations in the stress field orientation appear related with the topography geometry. From the analysis between the mean SHmax obtained and the acting forces, it can be concluded that the topographic control on the horizontal stress field seems to be dominant in the Cuyo Basin and in the north of Neuquen Basin. To the south of Neuquen Basin the horizontal stress field should be mainly controlled by the plate boundary forces. © 2009 by the American Geophysical Union. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699313_v114_n2_p_Guzman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic borehole breakout
data interpretation
plate boundary
stress field
stress measurement
Argentina
Cuyo Basin
Neuquen Basin
South America
spellingShingle borehole breakout
data interpretation
plate boundary
stress field
stress measurement
Argentina
Cuyo Basin
Neuquen Basin
South America
Guzmán, C.G.
Cristallini, E.O.
Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)
topic_facet borehole breakout
data interpretation
plate boundary
stress field
stress measurement
Argentina
Cuyo Basin
Neuquen Basin
South America
description Horizontal stress directions have been determined in the southernmost flat-slab boundary Andean retroarc between 32°44' and 33°40'S within Cuyo Basin, Argentina. These directions were obtained from the borehole breakout analysis of 42 wells using four-arm caliper data. The mean maximum horizontal stress (SHmax) direction for the whole region is 104.1° with a 95% confidence interval of 8.1°. The present-day stress field has an approximately preferred E-W trend maximum horizontal stress direction, consistent with the plate boundary forces (80°) and the topographic forces (near E-W). The calculated SHmax directions are near the expected values, but some local deviations were observed. The SHmax rotates from an E-W orientation in the south to a NW-SE orientation to the north of this sector of the Andean retroarc. A regional variation in the stress field can be observed when these results for the Cuyo Basin are analyzed together with those presented in a previous study in the Neuquen Basin to the south. The maximum horizontal stress varies from ̃NW-NE along this combined section of the Andean retroarc, with the ̃E-W SHmax directions in the northern Neuquen Basin consistent with those observed in the southern sector of Cuyo Basin. These variations in the stress field orientation appear related with the topography geometry. From the analysis between the mean SHmax obtained and the acting forces, it can be concluded that the topographic control on the horizontal stress field seems to be dominant in the Cuyo Basin and in the north of Neuquen Basin. To the south of Neuquen Basin the horizontal stress field should be mainly controlled by the plate boundary forces. © 2009 by the American Geophysical Union.
format JOUR
author Guzmán, C.G.
Cristallini, E.O.
author_facet Guzmán, C.G.
Cristallini, E.O.
author_sort Guzmán, C.G.
title Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)
title_short Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)
title_full Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)
title_fullStr Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)
title_full_unstemmed Contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary Andean retroarc (32°44' and 33°40'S)
title_sort contemporary stress orientations from borehole breakout analysis in the southernmost flat-slab boundary andean retroarc (32°44' and 33°40's)
url http://hdl.handle.net/20.500.12110/paper_21699313_v114_n2_p_Guzman
work_keys_str_mv AT guzmancg contemporarystressorientationsfromboreholebreakoutanalysisinthesouthernmostflatslabboundaryandeanretroarc3244and3340s
AT cristallinieo contemporarystressorientationsfromboreholebreakoutanalysisinthesouthernmostflatslabboundaryandeanretroarc3244and3340s
_version_ 1807319742834278400

Ejemplares similares