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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Lagoa Salgada Brazil
Microbial Biofacies and the Influence of Metazoans in Holocene Deposits of the Lagoa Salgada, Rio De Janeiro State, Brazil Available to Purchase
Study Area. A) Location of Rio de Janeiro State in Brazil. B) Location ... Available to Purchase
Three-dimensional pore connectivity evaluation in a Holocene and Jurassic microbialite buildup Available to Purchase
Dolomite formation during penecontemporaneous subaerial diagenesis: evidence from modern dolomite crusts forming in lagoon Brejo do Espinho, Brazil Available to Purchase
Sedimentological and geochemical characterization of microbial mats from Lagoa Vermelha (Rio de Janeiro, Brazil) Available to Purchase
Stratigraphic and sedimentary constraints on presalt carbonate reservoirs of the South Atlantic Margin, Santos Basin, offshore Brazil Available to Purchase
SIMPLE STRUCTURES AND COMPLEX STORIES: POTENTIAL MICROBIALLY INDUCED SEDIMENTARY STRUCTURES IN THE EDIACARAN SERRA DE SANTA HELENA FORMATION, BAMBUÍ GROUP, EASTERN BRAZIL Available to Purchase
The sulfur isotopic consequence of seawater sulfate distillation preserved in the Neoproterozoic Sete Lagoas post-glacial carbonate, eastern Brazil Free
The grandest of them all: the Lomagundi–Jatuli Event and Earth's oxygenation Open Access
Microbial carbonates: a sampling and measurement challenge for petrophysics addressed by capturing the bioarchitectural components Available to Purchase
Abstract Ancient and modern stromatolites are potentially a challenge for petrophysicists when characterizing biosediments of microbial origin. Because of the heterogeneity, sometimes very cemented and lacking porosity, sometimes highly porous, these widely differing states can be used to develop techniques that can have wider application to addressing the representative elementary volume (REV – single or multiple REVs) challenge in microbial carbonates. Effective media properties – like porosity – need to be defined on REV scales and the challenge is that this scale is often close to or significantly larger than the traditional core plugs on which properties are traditionally measured. A combination of outcrop images, image analysis techniques, micro-computed tomography (CT) and modelling have been used to capture the porosity (or in some cases, precursor porosity) architecture and provide a framework for estimating petrophysical property sensitivities in a range of situations that can be subjected to further calibration by measurements in relevant microbial reservoir rocks. This work will help guide the sampling approach along with the interpretation and use of petrophysical measurements from microbial carbonates. The bioarchitectural component, when controlling porosity in microbial carbonates, presents a significant challenge as the REV scale is often much larger than core plugs, requiring careful screening of existing data and measurement and additional geostatistical model-based approaches (with further calibration).