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dc.contributor.authorDorador Rodríguez, Javier 
dc.contributor.authorRodríguez Tovar, Francisco J. 
dc.contributor.authorMíguez Salas, Olmo
dc.identifier.citationDorador, J., Rodríguez-Tovar, F. J., & Miguez-Salas, O. (2021). The complex case of Macaronichnus trace fossil affecting rock porosity. Scientific Reports, 11(1), 1-7. []es_ES
dc.description.abstractBioturbation is an important factor for reservoir quality due to the modification of host rock petrophysical properties (i.e., porosity, permeability, and connectivity). However, there is no predictable relationship between bioturbation and its effect on rock properties, due to the variability of the involved ichnological features. A detailed ichnological analysis is necessary to determine how bioturbation affects petrophysical properties in a bioturbated reservoir. Traditionally, ichnological features such as density, tiering, size, orientation, architecture, and fill, have been considered. However, other properties have been undervalued as is the case of lining. Here, we present a detailed study on the effects of Macaronichnus burrows, an ichnotaxon usually related to hydrocarbon exploration due to its high concentration in rock notably affecting petrophysical properties. Macaronichnus, a subhorizontal cylindrical burrow, is characterized by a well-defined and developed outer rim surrounding the tube core. Our data indicates a clear zonation in porosity according to burrow structure, with the lowest porosity in the tube core and higher values associated with the surrounded rim. This duality is determined by the tracemaker grain selective feeding activity and the consequent concentrated cementation. The organism concentrates the lighter minerals in the tube core fill during feeding, favoring post-depositional cementation during diagenesis and this results in lower porosity than the host rock. However, heavy minerals, mainly glauconite, are located in the rim, showing higher porosity. Our results support the view that ichnological analyses are essential to determine reservoir quality in bioturbated reservoirs, evidencing that other ichnological properties in addition to those traditionally considered must be evaluated.es_ES
dc.description.sponsorshipEU's Horizon 2020 research and innovation program under the Marie Skodowska-Curie Grant 792314es_ES
dc.description.sponsorshipMinisterio de Educación, Cultura y Deporte, Spaines_ES
dc.description.sponsorshipSecretaria de Estado de I+D+I, Spain CGL2015-66835-P PID2019-104625RB-100es_ES
dc.description.sponsorshipJunta de Andalucía B-RNM-072-UGR18 P18-RT-4074es_ES
dc.description.sponsorshipScientific Excellence Unit (UGR) UCE-2016-05es_ES
dc.publisherNature Researches_ES
dc.rightsAtribución 3.0 España*
dc.titleThe complex case of Macaronichnus trace fossil affecting rock porosityes_ES

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