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dc.contributor.author
Schwarz, Ernesto
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dc.date.available
2024-05-16T13:34:44Z
dc.date.issued
2012
dc.identifier.citation
Lower cretaceous transgressive offshore sandstone bodies (Mulichinco Formation, Neuquén basin, Argentina): Outcrop analogues for tide-built sand ridges?; AAPG 2012 Annual Convention and Exhibition; Long Beach; Estados Unidos; 2012; 1-1
dc.identifier.uri
http://hdl.handle.net/11336/235524
dc.description.abstract
This study integrates sedimentology, ichnology, taphonomy, and palaeoecology of Mulichinco Formation strata in central Neuquén Basin (Argentina) to describe and interpret sharp-based sandstone bodies developed in a ramp-type marine setting. These bodies are sandwiched between finer grained siliciclastics beneath and thin carbonates above. The underlying sediments comprise progradational successions (2-10 m thick) from offshore mudstones to offshore-transition muddy sandstones, occasionally grading into lower-shoreface sandstones. The surfaces capping the regressive siliciclastics are flat and regionally extensive, and are demarcated by skeletal concentrations and a Glossifungites Ichnofacies suite. They are also marked by cobble-size, sandstone rip-up clasts, with incrustations and borings. These surfaces are interpreted as composite discontinuities, cut during a relative sea-level fall and remodeled during initial transgression (SB/TRS). The overlying transgressive sandstone bodies are 3-7 m thick, > 4 km long and about three times longer than wider. They are composed of clean, fine- and very fine-grained sandstones with little lateral changes in grain-size. Cross-stratification and cross-lamination are common, typically with smaller-scale structures and finer grain size towards the top. Large-scale, low-angle (5-8°) inclined stratification is also common, deeping at ~ 30° with respect to body elongation and dominant currents. These sand bodies are interpreted as tide-built offshore sand ridges. Intense burrowing is typical at the top of each unit, suggesting an abandonment stage. Final deactivation favored colonization by epibenthic-dominated communities and the formation of condensed skeletal-rich limestones during the latest transgressive conditions. As partial reworking of pre-existing ridges occurred during this stage, the sandstone bodies are considered the remnants of the transgressive offshore accumulations. The inferred tide-built offshore Mulichinco sandstone bodies have ~ 85% of net sand and they lack mud-prone facies. Their remaining volume is represented by non-reservoir cemented skeletal sandstones (sometimes occurring as internal inclined surfaces) that could produce reservoir compartmentalization. The lessons learned from these transgressive bodies could help recognizing similar units world-wide, as well as providing insights into characterization of reservoir analogues (e.g. Western Interior and offshore Java).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Association of Petroleum Geologists
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Transgressive Offshore Sandstone Bodies
dc.subject
Mulichinco Formation
dc.subject
Neuquén Basin
dc.subject
Analogues for sandridges reservoirs
dc.subject
Argentina
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Lower cretaceous transgressive offshore sandstone bodies (Mulichinco Formation, Neuquén basin, Argentina): Outcrop analogues for tide-built sand ridges?
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2024-05-03T16:02:36Z
dc.journal.pagination
1-1
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Houston
dc.description.fil
Fil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.searchanddiscovery.com/abstracts/html/2012/90142ace/abstracts/schw2.htm
dc.conicet.rol
Autor
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dc.coverage
Internacional
dc.type.subtype
Conferencia
dc.description.nombreEvento
AAPG 2012 Annual Convention and Exhibition
dc.date.evento
2012-04-22
dc.description.ciudadEvento
Long Beach
dc.description.paisEvento
Estados Unidos
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dc.type.publicacion
Book
dc.description.institucionOrganizadora
American Association of Petroleum Geologists
dc.description.institucionOrganizadora
Society for Sedimentary Geology
dc.source.libro
2012 AAPG Annual Convention and Exhibition, Abstracts volume
dc.date.eventoHasta
2012-04-25
dc.type
Conferencia
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