
handle: 10261/252655
Como mineral autigénico predominante, el cemento de calcita tiene un efecto muy significativo en la potencial calidad como reservorio del anticlinal de Puig-Reig, que constituye un excelente análogo para el estudio de la distribución de cementos en diferentes facies sedimentarias gracias a la cantidad y calidad de los afloramientos. Tras un exhaustivo estudio estratigráfico y de recogida muestras, se han realizado análisis petrográficos con microscopio óptico y de cátodo-luminiscencia de facies y sus cementos. Se han identificado dos generaciones principales de cementación calcítica que se desarrollaron durante y después del crecimiento del anticlinal, aunque la mayor parte del cemento cristalizó de manera simultánea a su formación. La distribución del cemento está controlada por la posición estructural dentro del pliegue y por las facies y litofacies de la roca encajante. Los depósitos de canales fluviales en la cresta del anticlinal, de grano especialmente grueso, tienden a desarrollar más cementación. Es necesario profundizar en el estudio de las características de la cementación de calcita para producir mejores estimaciones sobre la calidad de los reservorios y para guiar las actividades de exploración relacionada con los hidrocarburos o el almacenamiento geológico de CO2 en estructuras subterráneas similares.
As the most prevalent authigenic mineral, calcite cement exerts a significant effect on reservoir quality of the Puig-reig anticline, which is an excellent outcrop analogue to study calcite cement distribution due to good and continuous exposure. After stratigraphic logging and rock sampling, two major generations of calcite cementation have been identified using petrographic observations under optical and cathodoluminescence microscopes. They formed during and after anticline growth, respectively. Most calcite cement formed simultaneously with the anticline. Calcite cement distribution is controlled by the structural position of sediments in the fold and also by host sedimentary facies and lithofacies. Fluvial channel deposits of the anticline crest, especially relatively coarse deposits, tend to host more calcite cement. A more detailed study on calcite cementation is required to predict high-quality reservoirs and further guide petroleum exploration or carbon storage in similar subsurface structures.
Funding was provided by the Grup Consolidat de Recerca “Geologia Sedimentària” (2017SGR-824) and the DGICYT Spanish Project PGC2018-093903-B-C22. XS acknowledges funding by the China Scholarship Council for a PhD scholarship (201806450043). EGR acknowledges funding provided by the Spanish Ministry of Science, Innovation and Universities (“Ramón y Cajal” fellowship RYC2018-026335-I). JA is funded by MICINN (Juan de la Cierva fellowship - IJC2018-036074-I)
X Congreso Geológico de España, 5-7 Julio 2021, Vitoria - Gasteiz
Cementación de calcita, Pirineos, Pyrenees, Calcite cementation, fluvial and alluvial fan deposits, fluids, fluidos, depósitos fluviales y aluviales
Cementación de calcita, Pirineos, Pyrenees, Calcite cementation, fluvial and alluvial fan deposits, fluids, fluidos, depósitos fluviales y aluviales
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