Integration of channel meander abandonment age uncertainty into a stochastic channelized system reconstruction method
| Autor: | Pauline Collon, Marion Parquer, Guillaume Caumon |
|---|---|
| Přispěvatelé: | GeoRessources, Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Orientation (computer vision) fluvial sedimentary record Fluvial Channelized point bars 010502 geochemistry & geophysics 01 natural sciences Stochastic ordering remote sensing turbidite Path (graph theory) Meander heterogeneity [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology interpretation Geology Seismology 0105 earth and related environmental sciences Earth-Surface Processes Communication channel Meander cutoff |
| Zdroj: | Geomorphology Geomorphology, Elsevier, 2019, 345, pp.106824. ⟨10.1016/j.geomorph.2019.07.011⟩ |
| ISSN: | 0169-555X |
| DOI: | 10.1016/j.geomorph.2019.07.011 |
| Popis: | International audience; The logic of sedimentary channelized systems is only partly preserved in the depositional record. We propose a new method to reconstruct 3D channelized systems from incomplete observations made on surface or subsurface images that integrates the uncertainty on meander abandonment chronology. Starting with the youngest channel path observed and the abandoned loops in the meander belt, the method generates local relative chronologies using cross-cutting analysis. It thus proposes a possible global chronology of channel meander abandonments by going back in time while updating the system configuration. This global chronology is obtained through a stochastic procedure that orders the youngest abandoned meanders with regard to their position and orientation relative to the current channel path. Ordered abandoned meanders are then integrated in the main channel path during the reverse migration process so that the global stochastic ordering is made at each time step of the migration algorithm consistently with the updated channel belt. The proposed approach is parameterized by the spatio-temporal density of meander cutoff along the channel belt, which can be inferred from analog databases. The application of our tool on a seismic stratal slice of the Mc-Murray Formation in Canada provides various possible global chronologies of the abandoned meanders. We analyze the variability of these chronologies and highlight its impact on the various possible subsurface 3D global archi-tectures of the paleo-system and on the associated subsurface heterogeneity. |
| Databáze: | OpenAIRE |
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