Repositorio Digital Sernageomin
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Minuta por posibilidad de remoción en masa en condominio Hollstein, ciudad de Osorno, región de Los Lagos
No full textMinuta técnica8 p
New record of Puma concolor Linnaeus, 1771 (Carnivora, Felidae) for the Late Pleistocene of Urguay and its paleoecological significance
No full textFelidae entered South America from North America during the Ensenadan Stage/Age (Early to Middle Pleistocene). For Uruguay their fossil record is scarce but informative, although mostly correspond to large felids (Smilodon, Panthera onca). In this work describes fossil remain of a skull and a mandible assigned, based on morphology and statistical analysis, to Puma concolor. These materials were unearthed from Late Pleistocene sediments (Sopas Formation) from northern Uruguay. Based on these remains some paleobiological andpaleoecological aspects are discussed. This specimen had a body mass of about 45 kg, with the potential capacity to hunt animals over 200 kg, which is in agreement with previous reports for other fossil puma remains. During Late Pleistocene, in the current territory of Uruguay, Puma concolor would have shared ecological niche with other large carnivore such as sabre-tooth cats (Smilodon populator, S. fatalis), the jaguar Panthera onca, the canid Protocyon troglodytes, and short-faced bears Arctotherium, feeding upon medium-sized animals in diverse environment.pp.445-46
Actualización de la evaluación de susceptibilidad de remociones en masa en calles Circunvalación Escuela Agrícola con Valle Colonia, comuna de Coyhaique, región de Aysén del General Carlos Ibáñez del Campo
No full textRevisor: Carolina Jara. ; Informe Técnico14 p
Actualización de la evaluación de susceptibilidad de remociones en masa en calles Circunvalación Escuela Agrícola con Valle Colonia, comuna de Coyhaique, región de Aysén del General Carlos Ibáñez del Campo
No full textRevisor: Carolina Jara. ; Informe Técnico14 p
Observaciones geológicas en grietas en el sector Calabozo, Nueva Braunau, Comuna de Puerto Varas, Región de Los Lagos
No full textInforme Técnico INF-Los Lagos-05, 2022 -- Unidad Ejecutora: Oficina Técnica Puerto Varas11 p
Reporte de visita técnica por amenaza de volcamiento en el cerro La Cruz, comuna de Lebu, región del Biobío
No full textRevisor: Alejandro Alfaro ; Informe Técnico12 p
Visita técnica a sectores de la comuna de Tomé región del Biobío, afectados por remociones en masa durante Julio del 2022
No full textRevisores: Mónica Marín y Carolina Jara. ; Informe Técnico19 p
Evaluación geológica de puntos de encuentro transitorio en la comuna de Puerto Octay en caso de erupción del Volcán Osorno, Región de Los Lagos
No full textRevisor: Álvaro Amigo R. ; Informe Técnico34 p
Descripción geológica de tres alternativas de terrenos para emplazamiento de hospital provincial de Chiloé, comuna de Castro, región de Los Lagos
Get PDFInforme Técnico -- Unidad Ejecutora: Oficina Técnica Puerto Varas18 p
Relationship between fissility, composition, rock fabric and reservoir properties in Vaca Muerta Formation (Neuquén Basin, Argentina) : From outcrop to subsurface core data
Get PDFThe fissility is the ability of some rocks to split along relatively smooth surfaces parallel to the bedding. This property observed mostly in fine-grained rocks is particularly expressed in outcrops, where rocks are subjected to weathering processes. Most authors associate the fissility to the abundance of clay minerals and their orientation parallel to the bedding. The horizontal fabric can be promoted by depositional conditions such as sediment composition, quantity of total organic carbon content (TOC) and depositional mechanisms, giving rise to a primary fissility. Alternatively, the alignment of platy minerals can be linked to the burial history of the rock, by processes such as mechanical compaction or secondary mineral growth, resulting in a secondary fissility. The present study aims to identify the main controls of fissility development at the micro- and macroscopic scale in rocks of the Vaca Muerta Formation exposed in the Cerro Mulichinco area and in a 121-meter-long core extracted from a well within the Neuquén Basin. In outcrops, fissility is related to fine-grained laminated facies with low carbonate content, revealing the strong control exerted by lithology. The TOC measurements allow establishing a positive correlation between organic matter content and fissility intensity. Moreover, the analysis of the transgressive-regressive cycles shows that fissility is higher around the maximum flooding surfaces. Regarding their mechanical characteristics, the different interfaces observed in core are classified into first and second-order, the last one including fissility planes. Some of these interfaces evolve from potential (partially open) to effective (totally open) discontinuities in response to changes of stress conditions during the core extraction and due to the stress relaxation through time: weeks (T1), months (T2) and years (T3) after extraction. The time evolution of the effective core discontinuities points out rock intervals that are variably broken and core segments that remain intact. The Drying Alcohol Discontinuities (DAD) methodology reveals potential discontinuities within apparently intact core segments. By using this technique, a 4-class index is established as a proxy for fissility degree. When integrated with geological, petrophysical and geomechanical data, this index enables characterizing the main mechanisms controlling rock fissility that express through discontinuities promoting the loss of competence of a rock. Consequently, this mechanical property is considered to influence the efficiency of hydraulic fracture in shale reservoir completion.pp.345-38