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Se estudia la porosidad en las areniscas triasicas (facies Buntsandstein y Muschelkalk) de la Rama Aragonesa de la Cordillera Iberica, partiendo del calculo estimativo de la porosidad primaria del sedimento, para posteriormente analizar los distintos procesos diageneticos que han intervenido en su destruccion (compactacion mecanica, compactacion quimica y cementacion). La caracterizacion textural y genetica de los poros en dichas areniscas pennite establecer la existencia de procesos generadores de porosidad secundaria (disolucion y fractura). La disolucion del feldespato potasico, cemento carbonatico y de baritina se relaciona con flujos de aguas meteoricas ligadas a discordancias intramesozoicas, mientras que la porosidad de fractura se asocia a la estructuracion terciaria de la Cordillera Iberica. Por ultimo, se concluye que la cantidad de porosidad secundaria en las areniscas estudiadas depende fundamentalmente de la composicion original de los depositos, asi como de la geoquimica del ambiente de sedimentacion que controla las primeras etapas diageneticas (eo-diagenesis). Este hecho se traduce a lo largo de las series estudiadas en una variabilidad, tanto en la cantidad como en los tipos de porosidad. [ABSTRACT] Triassic sandstone's porosity (Buntsandstein and Muschelkalk facies) from the Aragonesa Branch of the Iberian Range are studied, firstIy at the sediment primary porosity calculation and secondly tbe porosity-reducing processes are analyzed. Processes creating secondary sandstone porosity can be established (dissolution and fracturing) by the textural and genetic caracterization of the sandstone's voids. The dissolution of potassium feldspar, carbonate cement and barite cement, is related with meteoric pore-water flow alloys to intramesozoic unconformities. Fracturing porosity is related to Iberian Range tertiary structuration. Finally, we conc1uded that the amount of the sandstone's secondary porosity depends mainly on the original composition of the sediments and also on the geochemical sedimentary environments that control the first diagenetic stages (eo-diagenesis). This faot manifests itself in tbe amount and types of variating porosities along the stratigraphic section.

La porosidad en las areniscas triásicas (Rama Aragonesa de la Cordillera Ibérica)