Shelf-margin deltas: their stratigraphic significance and relation to deepwater sands

Porębski, Szczepan J.; Steel, Ronald J.

doi:10.1016/s0012-8252(02)00161-7

Cited by 238 publications

(170 citation statements)

References 48 publications

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“…14; for example, compare with Posamentier and Kolla, 2003;Jobe and others, 2011). Sand-prone shelfal deposits with probable reservoir potential likely aggraded landward of the outcrop belt during normal regression lowstand conditions of LST-2 (for example, compare with Porębski and Steel, 2003;Covault and others, 2009) but were later eroded; however, contemporaneous along-strike shelfal settings may be preserved elsewhere. LST-1 of this study may constitute an older analog to this inferred LST-2 shelf, and a probable younger analog crops out in the Naknek Formation of Kamishak Bay (see below).…”

Section: Lst-2mentioning

confidence: 90%

Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central Alaska

Herriott¹,

Wartes²,

Decker³

2017

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Front cover. Oblique aerial view southeastward of Chisik Island summit area. This mountain-scale exposure of Naknek Formation exhibits evidence of a Late Jurassic deep-water canyon incised into slope strata of Snug Harbor Siltstone Member (gray-brown, wedge-shaped succession at left of exposure) and ultimately backfilled with basin-floor sandstones of the Pomeroy Arkose Member (at and below the summit ridge). Stratigraphic studies of the Naknek Formation along the ~80-km-long Iniskin-Tuxedni bays outcrop belt led to the recognition of three deep-water paleocanyons. These discoveries and related work permit the first sequence-stratigraphic interpretation for the Naknek Formation in the hydrocarbon-bearing Cook Inlet forearc basin. See figures 4 and 17A for photogeologic rendition and sequence-stratigraphic interpretation, respectively, of this Chisik Island locality. This part of the exposure is ~275 m tall, for sense of scale. Photograph by T.M. Herriott.

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Section: Lst-2mentioning

confidence: 90%

Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central Alaska

Herriott¹,

Wartes²,

Decker³

2017

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“…This facies is interpreted as shelf-margin deltas (e.g., Porębski & Steel, 2003;Moreira & Carminatti, 2004;Patruno et al, 2015) or shoreface deposits (e.g., Bourget et al, 2014) formed when sand-rich progradational systems advanced beyond the original shelf edge. In seismic data, both deposits appear as smaller-scale prograding clinoforms, and in well data both show a sand-rich composition.…”

Section: Seismic Facies Amentioning

confidence: 99%

“…In many cases, these high-relief clinoforms are contiguous to the shelf-margin deltas/shoreface deposits (seismic facies A), being interpreted as low-angle tangential (oblique) slope clinoforms (e.g., Porębski & Steel, 2003;Johannessen & Steel, 2005;Patruno et al, 2015). Descending trajectories and truncated topsets indicate that their genesis is related to periods of relative sea-level fall.…”

Section: Seismic Facies Bmentioning

confidence: 99%

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Seismic expression of depositional elements associated with a strongly progradational shelf margin: northern Santos Basin, southeastern Brazil

Berton

Vesely

2016

Braz. J. Geol.

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Seismic facies analysis and seismic geomorphology are important tools for the analysis of depositional elements in subsurface. This paper aimed to investigate the character and genesis of depositional elements and erosive features associated with an Eocene progradational shelf margin in northern Santos Basin. Identified seismic facies are interpreted as shelf-margin deltas/shoreface deposits, tangential (oblique) clinoforms, sigmoidal clinoforms, topset reflectors, mass-transport deposits and turbidites. These facies are grouped into four associations representing periods of relatively constant environmental conditions. Association 1 is composed of shelf-margin deltas/shoreface deposits, tangential clinoforms and extensive sand--rich turbidites disposed as submarine channels and frontal splays. A progressive increase in clinoform angle within this association has been identified, culminating in high-relief sigmoidal clinoforms with less voluminous turbidites of facies association 2. Association 3 is composed by subparallel to divergent topset reflectors, interpreted as continental to shelfal deposits placed during base-level rises. These are always truncated basinward by slump scars, formed as a consequence of sediment overload at the shelf margin during aggradations. Association 4 is composed of sigmoidal clinoforms, mass-transport deposits and turbidites. Early clinoforms are steeper as a consequence of the topography of the slump scars. Subsequently, dip angles become progressively gentler as the system approach to the equilibrium profile. The steep physiography was favorable for canyon incision, which played an important role in turbidite deposition. Mass-transport deposits, formed subsequent to slope collapse, are composed of mud-rich diamictites, and show strong internal deformation.KEYWORDS: Seismic facies; Seismic geomorphology; Deep-marine deposition; Mass-transport deposits; Turbidite systems. RESUMO: A análise de fácies sísmicas e a geomorfologia sísmica são ferramentas importantes para o estudo de elementos deposicionais em subsuperfície. Neste trabalho foram avaliadas as características e a gênese de elementos deposicionais e de feições erosivas associadas a uma margem progradante desenvolvida no Eoceno no norte da bacia de

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“…According to Suter and Berryhill (1985) and Porebski and Steel (2003) deltaic prograding clinoforms on the middle shelf tend to be at lower angle than that occurring near the shelf edge. These differences are linked to increased accommodation when the deltaic shoreline reaches deeper water.…”

Section: Introductionmentioning

confidence: 98%

Multi-proxy analysis in defining sedimentary processes in very recent prodelta deposits: the Northern Phlegraean offshore example (Eastern Tyrrhenian Margin)

Iorio

Capretto

Petruccione

et al. 2014

Rend. Fis. Acc. Lincei

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A multi-proxy analysis of Volturno River prodelta deposits in the outer shelf of Northern Phlegraean margin (Eastern Tyrrhenian Sea) has been carried out to reconstruct the sedimentary processes acting during recent times. The late Holocene sediments were characterized through Subbottom Chirp profiles coupled with sedimentological and petrophysical data. The chronostratigraphic framework was achieved by means of colorimetric parameter a* correlations with nearby dated marine sediment. A time interpretation of about 2,300 years BP is estimated for the sedimentary record collected in the cores. Seismic stratigraphic analysis shows late Holocene outer shelf deposits, characterized by fluid escape features and small-offset faults. However, the undisturbed sedimentation and the preservation of an internal geometry at decimetre scale, as detected by the sedimentological and petrophysical analysis, indicates a slow sliding without sediment reworking for this sedimentological body. So far a possible recent (\2,300 years BP) shear dominated downward displacement of high water content sediments, triggered by the occurrence of seismic activity, is inferred. Based on the depth-age conversion of the detected lithological features, a regular climatically driven change in the sediment supply of the prodelta depositional environment is suggested. The detection of spectrophotometry correlations of Holocene shelf margin sediments, several km apart, goes beyond the previous work and confirms even for continental shelf area the potential value of spectrophotometer data in high-resolution stratigraphic correlations.

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Shelf-margin deltas: their stratigraphic significance and relation to deepwater sands

Cited by 238 publications

References 48 publications

Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central Alaska

Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central Alaska

Seismic expression of depositional elements associated with a strongly progradational shelf margin: northern Santos Basin, southeastern Brazil

Multi-proxy analysis in defining sedimentary processes in very recent prodelta deposits: the Northern Phlegraean offshore example (Eastern Tyrrhenian Margin)

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