Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)

Wave-, tidal-, and fluvial-dominated deltas are important hydrocarbon reservoirs worldwide, and it is well known that depositional facies types, detrital composition and diagenetic products are key aspects when evaluating potential reservoir properties. Moreover, detrital composition and diagenetic...

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Autores principales:	Moyano Paz, Damián, Gómez Dacal, Alejandro Rubén, Varela, Augusto Nicolás, Comerio, Marcos Alejandro, Muñoz Olivero, Tobías Manuel, Bucher, Joaquín, Richiano, Sebastián Miguel, Poiré, Daniel Gustavo
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2022
Materias:	Ciencias Naturales Austral-Magallanes basin Petrographic analysis Clay assemblages SEM Tight-oil/gas
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/160177
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-160177
record_format	dspace
spelling	I19-R120-10915-1601772023-11-15T20:07:22Z http://sedici.unlp.edu.ar/handle/10915/160177 Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina) Moyano Paz, Damián Gómez Dacal, Alejandro Rubén Varela, Augusto Nicolás Comerio, Marcos Alejandro Muñoz Olivero, Tobías Manuel Bucher, Joaquín Richiano, Sebastián Miguel Poiré, Daniel Gustavo 2022-02-04 2023-11-15T14:25:39Z en Ciencias Naturales Austral-Magallanes basin Petrographic analysis Clay assemblages SEM Tight-oil/gas Wave-, tidal-, and fluvial-dominated deltas are important hydrocarbon reservoirs worldwide, and it is well known that depositional facies types, detrital composition and diagenetic products are key aspects when evaluating potential reservoir properties. Moreover, detrital composition and diagenetic products are controlled by external forces such as tectonism, climate, and depositional conditions. The Upper Cretaceous La Anita Formation (Austral-Magallanes Basin, Argentina) is a deltaic succession that shows a clear vertical variation in the relative role of wave, tidal and fluvial processes. The formation was accumulated during the foreland stage of the basin under relatively warm climate conditions. A detailed compositional and diagenetic analysis for these deposits is provided to evaluate the role of the controlling factors on the detrital and authigenic composition, and the impact on reservoir properties. Samples were analyzed by conventional petrography, X-ray diffraction and scanning electron microscopy to obtain a full spectrum of its detrital, authigenic and diagenetic composition. The analyzed sandstones were classified as lithic arenites which come from the fold-thrust belt region and from the magmatic arc located toward the westward. The clay mineral composition is characterized by variable proportions of illite, smectite, kaolinite and mixed-layer illite-smectite with the sporadic presence of chlorite. Stratigraphic variations in the abundance of authigenic kaolinite and smectite indicate a change in the climatic conditions during the depositions of the unit evolving from tropical to more temperate conditions. Diagenetic processes affecting the porosity are considered as controlled mainly by the lithological nature of the deposits and depositional facies type. Sandstone porosity is mainly primary in origin, moderate to good in abundance and show micropore to mesopore as the main pore-sizes. This work enhances that the diagenetic products are heavily controlled by the dominant depositional process. The presence of diagenetic products as quartz overgrowth and calcite and hematite cement reduces pore spaces and affects the reservoir properties. The development of these types of cement is conditioned by the relative dominance of wave and river processes. Under wave-dominated conditions, quartz tends to develop thick overgrowths. Conversely, under river-dominated conditions quartz overgrowths are thinner and calcite and hematite cementation patches are developed. Centro de Investigaciones Geológicas Facultad de Ciencias Naturales y Museo Consejo Nacional de Investigaciones Científicas y Técnicas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Austral-Magallanes basin Petrographic analysis Clay assemblages SEM Tight-oil/gas
spellingShingle	Ciencias Naturales Austral-Magallanes basin Petrographic analysis Clay assemblages SEM Tight-oil/gas Moyano Paz, Damián Gómez Dacal, Alejandro Rubén Varela, Augusto Nicolás Comerio, Marcos Alejandro Muñoz Olivero, Tobías Manuel Bucher, Joaquín Richiano, Sebastián Miguel Poiré, Daniel Gustavo Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)
topic_facet	Ciencias Naturales Austral-Magallanes basin Petrographic analysis Clay assemblages SEM Tight-oil/gas
description	Wave-, tidal-, and fluvial-dominated deltas are important hydrocarbon reservoirs worldwide, and it is well known that depositional facies types, detrital composition and diagenetic products are key aspects when evaluating potential reservoir properties. Moreover, detrital composition and diagenetic products are controlled by external forces such as tectonism, climate, and depositional conditions. The Upper Cretaceous La Anita Formation (Austral-Magallanes Basin, Argentina) is a deltaic succession that shows a clear vertical variation in the relative role of wave, tidal and fluvial processes. The formation was accumulated during the foreland stage of the basin under relatively warm climate conditions. A detailed compositional and diagenetic analysis for these deposits is provided to evaluate the role of the controlling factors on the detrital and authigenic composition, and the impact on reservoir properties. Samples were analyzed by conventional petrography, X-ray diffraction and scanning electron microscopy to obtain a full spectrum of its detrital, authigenic and diagenetic composition. The analyzed sandstones were classified as lithic arenites which come from the fold-thrust belt region and from the magmatic arc located toward the westward. The clay mineral composition is characterized by variable proportions of illite, smectite, kaolinite and mixed-layer illite-smectite with the sporadic presence of chlorite. Stratigraphic variations in the abundance of authigenic kaolinite and smectite indicate a change in the climatic conditions during the depositions of the unit evolving from tropical to more temperate conditions. Diagenetic processes affecting the porosity are considered as controlled mainly by the lithological nature of the deposits and depositional facies type. Sandstone porosity is mainly primary in origin, moderate to good in abundance and show micropore to mesopore as the main pore-sizes. This work enhances that the diagenetic products are heavily controlled by the dominant depositional process. The presence of diagenetic products as quartz overgrowth and calcite and hematite cement reduces pore spaces and affects the reservoir properties. The development of these types of cement is conditioned by the relative dominance of wave and river processes. Under wave-dominated conditions, quartz tends to develop thick overgrowths. Conversely, under river-dominated conditions quartz overgrowths are thinner and calcite and hematite cementation patches are developed.
format	Articulo Articulo
author	Moyano Paz, Damián Gómez Dacal, Alejandro Rubén Varela, Augusto Nicolás Comerio, Marcos Alejandro Muñoz Olivero, Tobías Manuel Bucher, Joaquín Richiano, Sebastián Miguel Poiré, Daniel Gustavo
author_facet	Moyano Paz, Damián Gómez Dacal, Alejandro Rubén Varela, Augusto Nicolás Comerio, Marcos Alejandro Muñoz Olivero, Tobías Manuel Bucher, Joaquín Richiano, Sebastián Miguel Poiré, Daniel Gustavo
author_sort	Moyano Paz, Damián
title	Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)
title_short	Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)
title_full	Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)
title_fullStr	Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)
title_full_unstemmed	Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)
title_sort	controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : an example from the la anita formation (argentina)
publishDate	2022
url	http://sedici.unlp.edu.ar/handle/10915/160177
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Controls on composition and diagenesis of wave- and river-dominated deltas: impacts on reservoir properties : An example from the La Anita Formation (Argentina)

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