Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/161645
Title: | Three-dimensional characterisation of sedimentary heterogeneity and its impact on subsurface flow behaviour through the braided-to-meandering fluvial deposits of the Castissent Formation (late Ypresian, Tremp-Graus Basin, Spain) |
Author: | Puig, J. M. Cabello López, Patricia Howell, John Arbués, Pau |
Keywords: | Sediments fluvials Geomorfologia fluvial Tremp (Catalunya) River sediments Fluvial geomorphology Tremp (Catalonia) |
Issue Date: | 2019 |
Publisher: | Elsevier B.V. |
Abstract: | Fluvial deposits of the Castissent Formation (late Ypresian) form part of the Eocene infill of the Tremp-Graus piggyback basin. The Castissent Formation has been subdivided into three complexes (A, B, and C). This project focuses on the proximal fluvial-sandstones of Complex A in the Mas de Faro outcrop (NE Iberian Peninsula). There, three amalgamated channel belts are exposed in a 15-24m thick succession that passes upwards from sandy braided-river deposits (A1-A2) to coarse-grained meandering-river deposits (A3). Sedimentary heterogeneities within these deposits are characterised and their impact on oil recovery in a reservoir analogue are estimated using field descriptions, virtual outcrop interpretation, a 3D geocellular facies model and fluid-flow simulations. Petrophysical values of different facies types were derived from well data through analogous fluvial deposits of the Eiriksson Formation, in the Norwegian North Sea. Facies analysis show a waning succession of gravel channel lags, unit-bar and dune deposits in A1; a basal mud-clast channel lag, unit-bars and dune deposits in A2, and a coarse-grained point-bar succession in A3. Flow simulation shows: a) fingering of the waterfront related to the gravel channel lag and unit-bars of A1 and A2, and the gravel bars, scour-and-fill deposits and dunes of A3, which act as thief zones hindering efficient sweeping of the intervals immediately above; b) segregation of the injected fluids towards the base of the channel belts due to the fining-upwards successions; and c) vertical compartmentalization due to a relatively impermeable barrier at mud-clast channel lag beds. Permeability contrasts trapped 35% of the original oil in place after 0.5-0.6 pore volumes were injected. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.marpetgeo.2019.02.014 |
It is part of: | Marine and Petroleum Geology, 2019, vol. 103, p. 661-680 |
URI: | http://hdl.handle.net/2445/161645 |
Related resource: | https://doi.org/10.1016/j.marpetgeo.2019.02.014 |
ISSN: | 0264-8172 |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
689804.pdf | 48.67 MB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License