Ali, T;
Lorenzo, JM;
Clift, PD;
Brown, A;
Konsoer, K;
(2025)
Quantitative identification of lithofacies by integrating diverse geophysical data in the Late Holocene False River point bar complex, Louisiana, USA.
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10.1190/INT-2024-0146.1.
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Abstract
The False River area of the Mississippi River preserves a Holocene example of a meandering river point bar in a continental-scale system. We predict lithofacies quantitatively, using K-means cluster analysis from a nine-well data set that integrates well-log data (electrical conductivity [EC], corrected pressure, and horizontal hydraulic permeability), grain-size analyses, and 14 defined sediment types. Data are collected from an unconsolidated and water-saturated environment down to 90 ft (27.4 m). Because of the low number of grain-size analyses, we develop a novel “hybrid” approach primarily using generalized additive models, which allow us to create a more extensive and accurate data set. Horizontal permeability values calculated from the corrected pressure match those found (800-21,000 mD) in the analogous Cretaceous-age McMurray Formation. We create six lithofacies clusters ranging from fine grained near the surface to coarse sand at the base, with a vertical resolution of 0.5 m. Envelope seismic attribute analysis along two profiles (30 and 52 m long) validates the lithofacies prediction by using well-log data from a subset of four additional wells. In addition, the relationship between the envelope seismic attribute and permeability helps validate the number of lithofacies at two tested well locations. Permeability projected along the envelope seismic attribute profile, away from the well location, aids in interpretation. Our quantitative lithofacies, well data (EC), and projected permeability maps support an interpretation of a buried remnant, channel-like feature, predating (>4000 years B.P.) the modern point bar system.
| Type: | Article |
|---|---|
| Title: | Quantitative identification of lithofacies by integrating diverse geophysical data in the Late Holocene False River point bar complex, Louisiana, USA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1190/INT-2024-0146.1 |
| Publisher version: | https://doi.org/10.1190/int-2024-0146.1 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10209054 |
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