| Title | Integration of channel meander abandonment age uncertainty into a stochastic channelized system reconstruction method |
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| Author | Parquer, M; Caumon, G ; Collon, P |
| Source | Geomorphology vol. 345, 106824, 2019., https://doi.org/10.1016/j.geomorph.2019.07.011  Open Access |
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| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20200210 |
| Publisher | Elsevier |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | Nature and Environment; Science and Technology; sedimentology; surficial geology/geomorphology; analytical methods; meanders; morphology; fluvial systems; turbidites; sedimentary structures; remote
sensing; geophysical interpretations |
| Illustrations | satellite images; flow diagrams; figures; tables; 3-D diagrams |
| Released | 2019 08 16 |
| Abstract | 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 McMurray 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 architectures of the paleo-system and on the associated subsurface heterogeneity. |
| GEOSCAN ID | 326622 |
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