Contourites along the Iberian continental margins: conceptual and economic implications

Estefania Llave, F.J. Hernández-Molina, M. García, Gemma Ercilla, Christina Roque, Carmen Juan, Anxo Mena, Benedict Preu, David Van Rooij, Michele Rebesco, Rachel Brackenridge, Gloria Jane, M. Gómez-Ballesteros, D. Stow

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This work uses seismic records to document and classify contourite features around the Iberian continental margin to determine their implications for depositional systems and petroleum exploration. Contourites include depositional features (separated, sheeted, plastered and confined drifts), erosional features (abraded surfaces, channels, furrows and moats) and mixed features (contourite terraces). Drifts generally show high- to moderate-amplitude reflectors, which are cyclically intercalated with transparent layers. Transparent layers may represent finer-grained deposits, which can serve as seal rocks. High-amplitude reflectors (HARs) are likely to represent sandier layers, which could form hydrocarbon reservoirs. HARs occur on erosive features (moats and channels), and are clearly developed on contourite terraces and overflow features. Most of the contourite features described here are influenced by Mediterranean water masses throughout their Pliocene and Quaternary history. They specifically record Mediterranean Outflow Water, following its exit through the Gibraltar Strait. This work gives a detailed report on the variation of modern contourite deposits, which can help inform ancient contourite reservoir interpretation. Further research correlating 2D and 3D seismic anomalies with core and well-logging data is needed to develop better diagnostic criteria for contourites. This can help to clarify the role of contourites in petroleum systems.
Original languageEnglish
Pages (from-to)403-436
Number of pages34
JournalGeological Society Special Publications
Volume476
Early online date9 Oct 2019
DOIs
Publication statusPublished - 2020

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Geology

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    Llave, E., Hernández-Molina, F. J., García, M., Ercilla, G., Roque, C., Juan, C., Mena, A., Preu, B., Van Rooij, D., Rebesco, M., Brackenridge, R., Jane, G., Gómez-Ballesteros, M., & Stow, D. (2020). Contourites along the Iberian continental margins: conceptual and economic implications. Geological Society Special Publications , 476, 403-436. https://doi.org/10.1144/sp476-2017-46