Deep-water and fluvial sinuous channels—Characteristics, similarities and dissimilarities, and modes of formation

Kolla, V.; Posamentier, Henry W.; Wood, Lesli J.

doi:10.1016/j.marpetgeo.2007.01.007

Cited by 166 publications

(120 citation statements)

References 42 publications

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“…The knickpoint gradients are significantly larger than the initial (valley) gradient Sv, and they increase with increasing values of Sv and with decreasing values of the dimensionless cutoff distance (the ratio between cutoff distance and channel width) ( . It has been suggested that early submarine channel sinuosity might be a result of processes other than centrifugal instability and bank retreat, such as preexisting topographic and/or structural influence (Kolla et al, 2001(Kolla et al, , 2007. Our observations suggest that high channel incision rates are responsible for the lack of depositional evidence for lateral bend growth and downstream channel translation.…”

Section: Discussionmentioning

confidence: 66%

Development of cutoff-related knickpoints during early evolution of submarine channels

Sylvester¹,

Covault²

2017

Preprint

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Submarine channels are often thought of as having relatively simple geometries, with significant alongchannel morphologic and stratigraphic continuity. Using high-resolution seismic reflection data from offshore Angola and a kinematic model of channel evolution, we present evidence that channels on the seafloor can develop slope variability as a result of meander cutoff events. When cutoffs develop, the shortened flow paths produce locally steep gradients, thus initiating knickpoints. Waves of knickpoint retreat and the related channel incision explain the occurrence of terraces and associated remnant channel deposits above the youngest channel thalweg. The simple processes of meander cutoff followed by knickpoint retreat are intrinsic to submarine channels and result in significant morphologic variability, erosion, and stratigraphic complexity, without any external forcing. These insights highlight the early evolution of submarine channels, a phase with a record that is commonly fragmented or completely absent as a result of subsequent erosion, and allow a better understanding of the autogenic controls on deep-marine stratigraphy.

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Section: Discussionmentioning

confidence: 66%

Development of cutoff-related knickpoints during early evolution of submarine channels

Sylvester¹,

Covault²

2017

Preprint

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“…The structural style of MTDs encountered varies with changes of environmental parameters. For the identification of MTDs, standard seismic interpretation techniques (Mitchum et al 1977;Catuneanu et al 2011) were supplemented with studies on seismic geomorphology and stratigraphy of depositional environment in deep-water settings (Posamentier 2003;Posamentier and Kolla 2003;Frey-Martínez et al 2005, 2006Lee et al 2007;Kolla et al 2007;Bull et al 2009). Erosional incisions and unconformities were mapped using seismic cross sections and time slices (variance cube).…”

Section: Methodology and Definition Of Mtdsmentioning

confidence: 99%

“…• Straight to meandering submarine channel systems develop at submarine slopes when turbidity currents are present (Catuneanu 2003;Lee et al 2007;Kolla et al 2007). They characterise the downward transport of a relatively dilute suspension of sediment grains that are supported by an upward component of fluid turbulence (Lee et al 2007).…”

Section: Methodology and Definition Of Mtdsmentioning

confidence: 99%

“…These recognitions led us to conclude that the channels were formed by channelised turbidity systems (e.g. Catuneanu 2003;Posamentier and Kolla 2003;Lee et al 2007;Kolla et al 2007;Posamentier and Martinsen 2011). According to Catuneanu (2003), splay complexes generally correspond to the place where energy of a flow decreases to a phase that releases the accumulation of the bulk of its sediment load.…”

Section: Seismic Observationsmentioning

confidence: 99%

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Mass-transport deposits and reservoir quality of Upper Cretaceous Chalk within the German Central Graben, North Sea

Arfai

Lutz

Franke

et al. 2015

Int J Earth Sci (Geol Rundsch)

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“…Seismic attribute maps extracted from 3D seismic datasets have been used increasingly to identify the geometries of depositional units within submarine channel complexes (e.g. Kolla et al 2007;Labourdette & Bez 2010). However, there are still significant resolution issues between seismic datasets and what geologists are able to observe, interpret and quantitatively extract from outcrop analogue studies.…”

Section: Introductionmentioning

confidence: 99%

Capturing stratigraphic and sedimentological complexity from submarine channel complex outcrops to digital 3D models, Karoo Basin, South Africa

Pringle

Brunt

Hodgson

et al. 2010

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Submarine slope channel-fills form complicated stratigraphy and lithofacies distributions through repeated phases of erosion and deposition. This provides a challenge to accurate 3D modelling, particularly in representing lithofacies transitions within sand-poor areas. In this paper, traditional (sedimentary logs, palaeocurrent measurements, architectural panels) and non-conventional technologies (Light Detection and Ranging; Ground Penetrating Radar) were integrated to quantitatively describe lithofacies distributions and sedimentary architectures from two large-scale outcrops, one base of slope, high sandstone content system (Unit B) and one from a mid-slope, more mixed lithology system (Unit C), in the Laingsburg Formation, Karoo Basin, South Africa.The workflow described in this study combines digital structural restoration and extrapolation of major stratigraphic surfaces, grouped palaeocurrents and architectural geometries observed at outcrop to create 3D digital models. The model was divided into zones along major stratigraphic discontinuities and populated using lithofacies associations that were adjusted for outcrop rugosity and palaeodispersal direction. Observed channel margin asymmetries, distribution of lithofacies and stacking patterns were all honoured in the digital models.The Unit C slope-channel system differs from many exposed submarine channels due to the low proportion of sandstone present within the infill. Thin-bedded channel margin lithofacies are preserved through the lateral stepping of channels and allow the correlation of stratigraphy from channel axis to margin and on to overbank areas. In the older, sandier Unit B base-of-slope system, the stratigraphic change in stacking pattern, channel aspect ratio, lithofacies of channel-fills and stratigraphic hierarchy were all captured. This research captured the architectural complexity observed at outcrop to generate more realistic models than could be constructed normally using limited subsurface data.

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Deep-water and fluvial sinuous channels—Characteristics, similarities and dissimilarities, and modes of formation

Cited by 166 publications

References 42 publications

Development of cutoff-related knickpoints during early evolution of submarine channels

Development of cutoff-related knickpoints during early evolution of submarine channels

Mass-transport deposits and reservoir quality of Upper Cretaceous Chalk within the German Central Graben, North Sea

Capturing stratigraphic and sedimentological complexity from submarine channel complex outcrops to digital 3D models, Karoo Basin, South Africa

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