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Analysing lithological and grain-size trends using a 3D voxel model: a case study from the Holocene Rhine-Meuse delta
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017 - Workshops, Jun 2017, cp-519-00107
- ISBN: 978-94-6282-219-1
Abstract
TNO Geological Survey of the Netherlands systematically produces 3D voxel models for answering subsurface related questions. The unique combination of vast amounts of borehole data and the voxel-based approach makes the models valuable new sources for exploring the Quaternary fluvial record. The latest generation of 3D voxel models (GeoTOP) schematises the shallow subsurface of the Netherlands in millions of voxels each measuring 100 by 100 by 0.5 m up to a depth of 50 m below sea level. The GeoTOP model was used to perform a 3D spatial trend analysis on channel belt lithology, sand grain-size and architectural characteristics in the Holocene Rhine-Meuse delta. An analysis of the coarse-sand and fine-sand fractions shows clear spatial trends that relate to downstream changes in gradient, reworking of older sediments and tidal influence. Channel deposit proportions show an almost linear downstream decrease with an average value of about 0.5% per km. Our data can act as an important constraint for hydrocarbon reservoir modelling where this type of information is often only sparsely available.