Characterisation of submarine depression trails driven by upslope migrating cyclic steps : Insights from the Ceará Basin (Brazil). / Maestrelli, Daniele; Maselli, Vittorio; Kneller, Benjamin; Chiarella, Domenico; Scarselli, Nicola; Vannucchi, Paola; Jovane, Luigi; Iacopini, David.

In: Marine and Petroleum Geology, 10.02.2020.

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Characterisation of submarine depression trails driven by upslope migrating cyclic steps : Insights from the Ceará Basin (Brazil). / Maestrelli, Daniele; Maselli, Vittorio; Kneller, Benjamin; Chiarella, Domenico; Scarselli, Nicola; Vannucchi, Paola; Jovane, Luigi; Iacopini, David.

In: Marine and Petroleum Geology, 10.02.2020.

Research output: Contribution to journalArticle

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Maestrelli, Daniele ; Maselli, Vittorio ; Kneller, Benjamin ; Chiarella, Domenico ; Scarselli, Nicola ; Vannucchi, Paola ; Jovane, Luigi ; Iacopini, David. / Characterisation of submarine depression trails driven by upslope migrating cyclic steps : Insights from the Ceará Basin (Brazil). In: Marine and Petroleum Geology. 2020.

BibTeX

@article{e05d64cae844458a85c435850d7345a7,
title = "Characterisation of submarine depression trails driven by upslope migrating cyclic steps: Insights from the Cear{\'a} Basin (Brazil)",
abstract = "Circular to elliptical topographic depressions, isolated or organized in trails, have been observed on the modern seabed in different contexts and water depths. Such features have been alternatively interpreted as pockmarks generated by fluid flow, as sediment waves generated by turbidity currents, or as a combination of both processes. In the latter case, the dip of the slope has been hypothesized to control the formation of trails of downslope migrating pockmarks. In this study, we use high-quality 3D seismic data from the offshore Cear{\'a} Basin (Equatorial Brazil) to examine vertically stacked and upslope-migrating trails of depressions visible at the seabed and in the subsurface. Seismic reflection terminations and stratal architecture indicate that these features are formed by cyclic steps generated by turbidity currents, while internal amplitude anomalies point to the presence of fluid migration. Amplitude Versus Offset analysis (AVO) performed on partial stacks shows that the investigated anomalies do not represent hydrocarbon indicators. Previous studies have suggested that the accumulation of permeable and porous sediments in the troughs of vertically stacked cyclic steps may create vertical pathways for fluid migration, and we propose that this may have facilitated the upward migration of saline pore water due to fluid buoyancy. The results of this study highlight the importance of gravity-driven processes in shaping the morphology of the Cear{\'a} Basin slope and show how non-hydrocarbon fluids may interact with vertically stacked cyclic steps. ",
author = "Daniele Maestrelli and Vittorio Maselli and Benjamin Kneller and Domenico Chiarella and Nicola Scarselli and Paola Vannucchi and Luigi Jovane and David Iacopini",
year = "2020",
month = feb
day = "10",
doi = "10.1016/j.marpetgeo.2020.104291",
language = "English",
journal = "Marine and Petroleum Geology",
issn = "0264-8172",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Characterisation of submarine depression trails driven by upslope migrating cyclic steps

T2 - Insights from the Ceará Basin (Brazil)

AU - Maestrelli, Daniele

AU - Maselli, Vittorio

AU - Kneller, Benjamin

AU - Chiarella, Domenico

AU - Scarselli, Nicola

AU - Vannucchi, Paola

AU - Jovane, Luigi

AU - Iacopini, David

PY - 2020/2/10

Y1 - 2020/2/10

N2 - Circular to elliptical topographic depressions, isolated or organized in trails, have been observed on the modern seabed in different contexts and water depths. Such features have been alternatively interpreted as pockmarks generated by fluid flow, as sediment waves generated by turbidity currents, or as a combination of both processes. In the latter case, the dip of the slope has been hypothesized to control the formation of trails of downslope migrating pockmarks. In this study, we use high-quality 3D seismic data from the offshore Ceará Basin (Equatorial Brazil) to examine vertically stacked and upslope-migrating trails of depressions visible at the seabed and in the subsurface. Seismic reflection terminations and stratal architecture indicate that these features are formed by cyclic steps generated by turbidity currents, while internal amplitude anomalies point to the presence of fluid migration. Amplitude Versus Offset analysis (AVO) performed on partial stacks shows that the investigated anomalies do not represent hydrocarbon indicators. Previous studies have suggested that the accumulation of permeable and porous sediments in the troughs of vertically stacked cyclic steps may create vertical pathways for fluid migration, and we propose that this may have facilitated the upward migration of saline pore water due to fluid buoyancy. The results of this study highlight the importance of gravity-driven processes in shaping the morphology of the Ceará Basin slope and show how non-hydrocarbon fluids may interact with vertically stacked cyclic steps.

AB - Circular to elliptical topographic depressions, isolated or organized in trails, have been observed on the modern seabed in different contexts and water depths. Such features have been alternatively interpreted as pockmarks generated by fluid flow, as sediment waves generated by turbidity currents, or as a combination of both processes. In the latter case, the dip of the slope has been hypothesized to control the formation of trails of downslope migrating pockmarks. In this study, we use high-quality 3D seismic data from the offshore Ceará Basin (Equatorial Brazil) to examine vertically stacked and upslope-migrating trails of depressions visible at the seabed and in the subsurface. Seismic reflection terminations and stratal architecture indicate that these features are formed by cyclic steps generated by turbidity currents, while internal amplitude anomalies point to the presence of fluid migration. Amplitude Versus Offset analysis (AVO) performed on partial stacks shows that the investigated anomalies do not represent hydrocarbon indicators. Previous studies have suggested that the accumulation of permeable and porous sediments in the troughs of vertically stacked cyclic steps may create vertical pathways for fluid migration, and we propose that this may have facilitated the upward migration of saline pore water due to fluid buoyancy. The results of this study highlight the importance of gravity-driven processes in shaping the morphology of the Ceará Basin slope and show how non-hydrocarbon fluids may interact with vertically stacked cyclic steps.

U2 - 10.1016/j.marpetgeo.2020.104291

DO - 10.1016/j.marpetgeo.2020.104291

M3 - Article

JO - Marine and Petroleum Geology

JF - Marine and Petroleum Geology

SN - 0264-8172

M1 - 104291

ER -