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Article Dans Une Revue Marine and Petroleum Geology Année : 2020

Combined inverse and forward numerical modelling for reconstruction of channel evolution and facies distributions in fluvial meander-belt deposits

Na Yan
  • Fonction : Auteur
Pauline Collon
Guillaume Caumon

Résumé

The sedimentary record of meandering rivers contains a diverse and complex set of lithological heterogeneities, which impact natural resource management. Different methods exist to model such accumulated successions present in the subsurface by integrating knowledge of system evolutionary behaviour and geometries visible on seismic time or stratal slices. With reference to case-study examples, we review, discuss and employ two of these methods: (i) ChaRMigS generates possible scenarios for channel evolution and meander cutoffs by a reverse migration process; (ii) PB-SAND is a forward stratigraphic model which simulates fluvial point-bar geometry and facies distributions from known palaeo-channel geometries. We introduce a workflow to demonstrate how these two methods can be applied in combination to predict fluvial meander-belt facies distributions, using a subsurface dataset on a Pleistocene succession from the Gulf of Thailand where abandoned channels are visible on seismic time slices, but for which bar-accretion geometries and the exact timing of channel abandonment are unclear. Results show the value of a combined modelling approach to automate the stochastic generation of facies distributions constrained by seismic interpretations.
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Dates et versions

halshs-02549886 , version 1 (21-04-2020)
halshs-02549886 , version 2 (28-04-2020)

Identifiants

Citer

Marion Parquer, Na Yan, Luca Colombera, Nigel P. Mountney, Pauline Collon, et al.. Combined inverse and forward numerical modelling for reconstruction of channel evolution and facies distributions in fluvial meander-belt deposits. Marine and Petroleum Geology, 2020, 117, pp.104409. ⟨10.1016/j.marpetgeo.2020.104409⟩. ⟨halshs-02549886v2⟩
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