Background

Methodology

Nordkapp Basin Bjarmeland Platform

Kapp

Tosc

ana

Snad

d

Fruh.

Kobbe

Klapp.

HavertSass

enda

len

Tria

ssic

Form

.

Gro

up

Chronostratigra.

Norian

Rhaetian

Carnian

Ladinian

Anisian

Oleneki.

Induan

199

203

216

228

237

245

249

251

Alluvium/Fluvial channel

Coastal plain/Delta plain

Estuarinedeposits

Shallow marinesandstones

Marine siliciclasticmudrocks

Submarine fandeposits

UnconformityHiatus

Hydrocarbon source rock

Angular clinoforms

1. Obesum4. Ververis

2. Caurus3. Guovca

The Barents Sea, today the site of a continental shelf and the islands of the Svalbard archipelago, hosted a vast low-gradient prograding deltaic plain in the Triassic. It stretched from the Ural and Caledonian mountain belts in the southeast and south, and north to Spitsbergen. Progradation was made possible by high sediment yield, and conduits for sediment transport were huge trunk river systems fed by a signi�cant drainage area that comprised most of the northern margin of Pangaea (Glørstad-Clark et al., 2010; Henriksen et al., 2011; Riis et al., 2008; Skjold et al.,1998). Parts of these river systems have since become the focus for hydrocarbon exploration and as a consequence are now well covered by a variety of subsurface data, including high-resolution 3D seismic data. This study is focussed on the Ladinian to Early Norian Snadd Formation in the southwestern Barents Sea.

Using a variety of seismic imaging techniques, e.g. spectral decomposition and RGB-blending, the project aims to understand the palaeogeographic extent and signi�cance of this �uvial system in order to explain geometric properties and reservoir characteristics of the �uvial channels, their spatial variability and stratigraphic evolution.

Five 3D seismic volumes located across the southwestern Barents Sea samples the succession at di�erent locations along an oblique-to depositional dip oriented transect.

Polygons was used to trace channel features across time-slices and to de�ne the individual channels.Parameters were measured based on the channel outline as de�ned by the seismic data, in accordance withpublished literature on �uvial systems (Bridge, 2003; Gibling, 2006; Stølum, 1998).

Left: Schematic stratigraphyof the Triassic interval in the southwestern Barents Sea.Simpli�ed from Henriksenet al., 2011.

Left: Overview of 3D-seismic surveys used in thisstudy, numbers marks thedata presented here. Greenlines indicate new, regional2D surveys. Basins andplatforms are indicated, redlines marks major structuralfeatures.

Right: 3D-view that showspolygons marking individual channel bodies.

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180°

160°E

140°

120°

100°

80°

60°

40°

20°

0°

20°

40°

60°

80°

100°

120°

140°

160°

N°08

N°07

Bathymetric and topographic tints

-5000 -4000 -3000-2500-2000 -1500-1000 -500 -200 -100 -50 -25 0-10 50 100 200 300 400 500 600 700 800 1000 (Meters)

Right: A) Regional setting,Jakobsson et al., 2008.B) Based on mapping of shelf-edge clinoform breaks, Glørstad-Clark et al., 2010, constructed a regional palaeogeographic map of the lower Snadd Formation and its time-equivalent deposits. Area studied in the present project is marked in B).