Print Email Facebook Twitter On the origin of crevasse-splay amalgamation in the Huesca fluvial fan (Ebro Basin, Spain) Title On the origin of crevasse-splay amalgamation in the Huesca fluvial fan (Ebro Basin, Spain): Implications for connectivity in low net-to-gross fluvial deposits Author van Toorenenburg, K.A. (TU Delft Applied Geology) Donselaar, M.E. (TU Delft Applied Geology) Noordijk, Niels (Van Oord Marine Ingenuity, Rotterdam) Weltje, G.J. (Katholieke Universiteit Leuven) Date 2016 Abstract Floodplain deposits are abundant in low-gradient dryland river systems, but their contribution to connected reservoir volumes has not yet been fully acknowledged due to their poor detectability with typical wireline log suites and relatively-lower reservoir quality. This study presents an analysis of stacked crevasse splays in the distal part of the Miocene Huesca fluvial fan (Ebro Basin, Spain). Vertical stacking of crevasse splays implies local aggradation of the active channel belt. Lateral amalgamation of crevasse splays created an elevated rim around their feeder channel, raising its bankfull height. Subsequent crevasse splays were deposited on top of their predecessors, creating sand-on-sand contact through incision and further raising the active channel belt. This process of channel-belt super-elevation repeated until an upstream avulsion occurred. Amalgamated crevasse splays constitute connected reservoir volumes up to ~ 107 m3. Despite their lower reservoir quality, they effectively connect channel deposits in low net-to-gross fluvial stratigraphy, and hence, their contribution to producible volumes should be considered. Unswept intervals of amalgamated crevasse splays may constitute a secondary source of natural gas. Their interval thickness can serve as a proxy for feeder-channel dimensions, which can in turn be used to estimate the degree of stratigraphic connectivity. Subject Low-gradient dryland river systemsLow net-to-gross fluvial stratigraphyHuesca fluvial fanCrevasse splaysStacking mechanismConnectivity To reference this document use: http://resolver.tudelft.nl/uuid:299ea52f-ed1a-44cd-b380-1f0369fd592f DOI https://doi.org/10.1016/j.sedgeo.2016.08.008 Embargo date 2018-07-01 ISSN 0037-0738 Source Sedimentary Geology, 343, 156-164 Part of collection Institutional Repository Document type journal article Rights © 2016 K.A. van Toorenenburg, M.E. Donselaar, Niels Noordijk, G.J. Weltje Files PDF SEDGEO5109AAM.pdf 157.48 MB Close viewer /islandora/object/uuid:299ea52f-ed1a-44cd-b380-1f0369fd592f/datastream/OBJ/view