Poster De Conférence Année : 2025

Addressing correlation uncertainties within continental limestones using stochastic simulations with WeCo

Résumé

The correlation of facies in continental carbonates – particularly lacustrine and palustrine carbonates – is notably difficult due to their pronounced heterogeneity, frequent discontinuities, and potential diagenetic or structural overprints. These factors often lead to lateral facies transitions over sub-meter scales, complicating the construction of coherent stratigraphic models. In this context, high-resolution datasets concentrated within small areas are essential to capture this variability and, ultimately, make it possible to improve geological models in such environments. Sedimentological analysis of the Beauce Limestones at the O-ZNS Site (Observatoire des transferts dans la Zone-Non-Saturée) located near Orléans, France, provide a dataset beyond compare, including eight 20-to-25-meter-deep cored boreholes and a central 20-m-deep, 6-meter-diameter well, all confined within 900 m² (30 × 30 m) area. This observatory aims to unravel water and pollutant transfer within the vadose zone in the context of the largest drinking water aquifer of France currently facing quality and availability challenges. Despite the high density of available observations, rather than completely solving the question of the heterogeneities, this dataset seriously questions the possibility to produce a reliable – deterministic – correlation of facies or stratigraphy in continental limestones, even at the scale of the observatory. Nevertheless, the aim of the O-ZNS to understand water transfer in the vadose zone require a model of hydrological properties of this domain, which starts with correlating the available observations. In this contribution, we propose to address the epistemic uncertainties identified at the O-ZNS site by applying the multiple well correlation framework provided by WeCo. This approach makes it possible to transfer the knowledge gained from outcrop interpretation into correlation rules that guide stochastic correlations. Through this approach, a diversity of possible correlation is generated to serve as a basis for further modelling possible petrophysical models. The obtained results are compared to the two correlation transects along the cored boreholes proposed as a result of initial sedimentological work study of the site.

Fichier principal
Vignette du fichier
Poster RING 2025 V2-1.pdf (32.48 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-05294288 , version 1 (02-10-2025)

Licence

Identifiants

  • HAL Id : hal-05294288 , version 1

Citer

Thibaut Jamey, Gautier Laurent, Céline Mallet, Simon Andrieu, Églantine Husson, et al.. Addressing correlation uncertainties within continental limestones using stochastic simulations with WeCo. RING Meeting 2025, Sep 2025, Nancy, France. , 2025. ⟨hal-05294288⟩
68 Consultations
22 Téléchargements

Partager

  • More