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Thin-bedded turbidites; overview and petroleum perspective

Dorrik A. Stow and Bayonle A. Omoniyi
Thin-bedded turbidites; overview and petroleum perspective (in Rift-related coarse-grained submarine fan reservoirs; the Brae Play, South Viking Graben, North Sea, Colin C. Turner (editor) and Bryan T. Cronin (editor))
AAPG Memoir (January 2018) 115: 97-118

Abstract

Among the broad range of transport and depositional processes that operate in deep-water, turbidity currents are widely recognized as one of the most common. Turbidite deposits, therefore, are a common facies in many deep-water systems, and within these the thin-bedded (TBTs) and very-thin-bedded turbidites (VTBTs) are most abundant. In many hydrocarbon-bearing turbidite systems, they represent a huge and relatively neglected potential for exploration and production; hence we have used data gathered from modern, ancient, and subsurface systems to synthesize their principal characteristics. They are generally deposited from low-concentration flows (0.25-50 kg/m (super 3) [0.02-3 lb/ft (super 3) ]) that have reached relatively low velocities (0.15-0.5 m/s [0.5-1.6 ft/s]) with individual beds deposited between 1 hour (thin sandy turbidites) and several days (silt-mud turbidites). The standard Bouma facies model best represents TBTs, and the Stow model typifies VTBTs. Turbidites typically show many partial-sequence variations from the ideal complete sequence. Distinctive facies associations are characteristic of turbidites in channel, lobe, open slope, and basinal settings, whereas vertical sequences of bed thickness are less easily attributed to specific environments. Small-scale (micro-sequences), typically of three to seven beds arranged in symmetric to asymmetric patterns, are the most commonly observed. For quantitative characterization of TBTs and VTBTs, we have developed a series of attribute indices-including facies net-to-gross, sand connectivity, facies ratio, and sediment textural indices. These serve as input data for reservoir modeling and simulation and for characterizing associated architectural elements.


ISSN: 0271-8529
Coden: MAPGAN
Serial Title: AAPG Memoir
Serial Volume: 115
Title: Thin-bedded turbidites; overview and petroleum perspective
Title: Rift-related coarse-grained submarine fan reservoirs; the Brae Play, South Viking Graben, North Sea
Author(s): Stow, Dorrik A.Omoniyi, Bayonle A.
Author(s): Turner, Colin C.editor
Author(s): Cronin, Bryan T.editor
Affiliation: Heriot-Watt University, Institute of Petroleum Engineering, Edinburgh, United Kingdom
Affiliation: Marthon International Oil, Aberdeen, United Kingdom
Pages: 97-118
Published: 20180101
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
ISBN: 9781629812816
References: 85
Accession Number: 2021-047468
Categories: Sedimentary petrologyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, strat. cols.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute.
Update Code: 202115
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