Non-living Resources of the OCS Harald Brekke NPD
The Continental Shelf and the Area http://www.grida.no/publications/shelf-last-zone/
Outer Continental Shelf Example http://www.grida.no/publications/shelf-last-zone/
Norwegian Continental Shelf (NOCS) Hydrocarbon Management
Geographical Location Arctic Ocean Svalbard Barents Sea Jan Mayen Faroe Islands 5
NE Atlantic Overview 6
Barents Sea NOCS Structure map Norwegian Sea North Sea
General Stratigraphy
Main Prospective Level
The Platform Margin
Barents Sea NOCS Structure map Norwegian Sea North Sea
Barents Sea Shelf Profile
The Rifted, Volcanic Margin
Barents Sea NOCS Structure map Norwegian Sea North Sea
Regional Geoseismic Sections Vøring Basin
Vøring Basin Trødelag Platform
Sills and Inner Flows
Fracture Zone Ridge
Seismic Line LOS-99-06 S N Vøring Spur
Sediment rich Abyssal Plain
Seismic Line LOS-99-010 NW SE
The Microcontinent Margin
Jan Mayen Microcontinent but I shall contact him on Monday 23
Jan Mayen Microcontinent but I shall contact him on Monday 24
Palinspastic Crustal Transects 25 Ma Present Mjelde et al. 2008
Jan Mayen Tectonics Courtesy of Orkustofnun
Resource assessment
Play Model A population of discoveries and prospects that share the same critical, geological factors: Reservoir rock (age and type) Trap mechanism (tectonic, stratigraphic) Source (source rock, maturity, migration)
Reservoir
Trap
Source
Play model
Play model and mapped prospects
Statistical Play Assessment Prospect model Reservoir parameters Liquid parameters Recovery factor Prospect number distribution Area covered Prospect density Prospect size distribution Mapped prospects Minimum and maximum size estimates Risk assessment Prospect level Play model level
1971: Brent Oil Field Discovery FINLAND SWEDEN BRENT Balder Ekofisk Groningen Nordisk Geologisk Vintermøte Uppsala 2004
Brent Play Model Reservoir: Middle Jurassic sandstone Trap: Rotated fault block Source: Upper Jurassic black shales
Brent Play Norwegian North Sea Oil Fields Gas Fields
Barents Sea Extrapolation of the Brent Play on the Norwegian Sea NCS North Sea Nordisk Geologisk Vintermøte Uppsala 2004
Norwegian Continental Shelf (NOCS) Recoverable HC Resources
Undiscovered Resources
Confirmed and unconfirmed plays
Number of Plays
Hydrocarbon Resources Beyond 200 M
Limits and lines associated with NOCS
NOCS
HC Beyond 200 M
HC Beyond 200 M
Eocene Lava Play
Pre-Palaeocene Sandstones Play
Plays straddling 200 M limit line
Size of Plays, Norwegian Sea
Seabed Mineral Resources, NOCS
Active and Extinct Vent fields at the Arctic Mid-Ocean Ridge Hydrothermal plume Sulfide deposit Extinct field Active field Pedersen et al. 2010 Courtesy of R. B. Pedersen, Univ of Bergen
Active fields and OCS http://www.interridge.org/irvents/maps http://www.vliz.be/vmdcdata/marbound
Active fields and OCS http://www.interridge.org/irvents/maps http://www.vliz.be/vmdcdata/marbound
The Jan Mayen Vent Field Area Courtesy of R. B. Pedersen, Univ of Bergen
The Troll Wall Vent Field Courtesy of R. B. Pedersen, Univ of Bergen
The Soria Moria Vent Field Located on a Volcanic Ridge 100m Courtesy of R. B. Pedersen, Univ of Bergen
Neovolcanic zone and off-axis areas 75 m grid Central Mohns Ridge 10km
Active fields and OCS http://www.interridge.org/irvents/maps http://www.vliz.be/vmdcdata/marbound
Burial of Ridge Flank and Rift Valley by The Bear Island Fan 50km Courtesy of R. B. Pedersen, Univ of Bergen
Location of the Loki s Castle Vent Field Courtesy of R. B. Pedersen, Univ of Bergen 7 00E 7 30E 8 00E 8 30E 9 00E 73 50 Core complexes 73 40 Mohn s Treasure 73 30 Loki s Castle 600 m Bear Island Fan 73 20 Figure 7 Sulphide layer in sediment core 10 km 3500 m
Loki s Castle - Relations to Volcanic & Structural Elements 3300 m Bear Island Fan Faulted Terrain Developing Core Complex? 1800 m young volcanic flows Loki s Castle Rift 2010 m Axial Volcanic Ridge N 1km Courtesy of R. B. Pedersen, Univ of Bergen
AUV survey 2010 N Loki s Castle Kongsberg Hugin EM 2000 2 m grid Courtesy of R. B. Pedersen, Univ of Bergen 1 km
Microbathymetry of the Loki s Castle Vent Field Hydrothermal mineral deposit High temperature vent sites 100 m Courtesy of R. B. Pedersen, Univ of Bergen
Chimneys & Hydrothermal Deposits 13 m Courtesy of R. B. Pedersen, Univ of Bergen
Loki s Castle Hydrothermal Mound Courtesy of R. B. Pedersen, Univ of Bergen
Comparison with the TAG Hydrothermal Mound TAG Loki s Castle Courtesy of R. B. Pedersen, Univ of Bergen TAG 100 m Loki s Castle
Estimated Tonnage Coverage: 40.000 m 2 Max Height: 25-35 m Tonnage: 1-2 Mt Courtesy of R. B. Pedersen, Univ of Bergen 100 m
Seafloor Massive Sulfide Deposits Norwegian Continental Shelf Sediment & basalt hosted deposits Courtesy of R. B. Pedersen, Univ of Bergen Basalt hosted Zn (Au) deposits Basalt hosted Cu-Zn deposits
Global Neovolcanic Zone
Total Amount of Cu-Zn along the Neovolcanic Zone of the Global Ridge System 1000 deposits minimum size of 100 t maximum size of 1x10 7 t Total amount of massive sulfide estimated to 6x10 8 t Median grade of 5 wt% Cu+Zn Total amount Cu+Zn estimated to be 3x10 7 t Hannington et al. 2011, Geology Courtesy of R. B. Pedersen, Univ of Bergen
Estimated amounts of Cu-Zn along the Neovolcanic zone of the Norwegian Ridge System The total amount Cu+Zn is estimated to be on the order of 3x10 7 t Approximately 90% of this is at slow spreading ridges The global ridge system is 67000 km long of which 55-60% is spreading at a slow rate The ridges within the Norwegian CS is around 1300 km, which represent 3% of the slow spreading ridges The amount of Cu-Zn along the neovolcanic part of the Norwegian ridges is estimated to be on the order of 1x10 6 t (No good model for development of flanking core complexes as yet) Based on Hannington et al. 2011 Courtesy of R. B. Pedersen, Univ of Bergen
Deep Sea Geotopes, NOCS
Sediment fans
Ocean Spreading Ridges
Magma-influenced Continental Crust
Fracture Zone Ridges and Seamounts
Seabed Geotopes
Geotopes and Resource Distribution A Tentative Approach
Geotopes and Resource Deposits Shelf Plateaus Magmatically influenced CC Sediment fans Volcanic Arcs Spreading ridges Fracture Zones, Seamounts Magmatic Plateaus (LIPs) Abyssal Plains, Low-sed Abyssal Plains, High-sed HC HC, FMC, (SMS) HC, (SMS?) SMS SMS FMC SMS?, PMN? PMN? (HC?)
Geotope Features as Basis for Outer Limits Shelf Plateaus Magmatically influenced CC Sediment fans Volcanic Arcs Spreading ridges Fracture Zones, Seamounts Magmatic Plateaus (LIPs) Abyssal Plains, Low-sed Abyssal Plains, High-sed HC HC, FMC, (SMS) HC, (SMS?) SMS SMS FMC SMS?, PMN? PMN? (HC?)
Areas of the current submissions 83
Geological Features in OCS Features No of Submissions Considered by CLCS Recomm Not Recom Included in OCS so far Shelf plateaus 21 12 11 0 11 Magmatically influenced continental crust features 25 15 14 0 14 Sediment fans, wedges 15 5 4 0 1 Volcanic Arcs 5 2 2 0 2 Spreading ridges 5 2 0 2 1 Spreading ridges, anomalous 4 0 0 0 0 Fracture Zones, seamounts 26 14 8 6 11 Magmatic plateaus (incl. LIPs) 7 3 3 0 3
Shelf Plateaus http://www.grida.no/publications/shelf-last-zone/
Magmatically influenced CC features http://www.grida.no/publications/shelf-last-zone/
Fracture Zones, Seamounts http://www.grida.no/publications/shelf-last-zone/
Sediment Fans and Wedges http://www.grida.no/publications/shelf-last-zone/
Volcanic Arcs http://www.grida.no/publications/shelf-last-zone/
Spreading Ridges http://www.grida.no/publications/shelf-last-zone/
Anomalous Spreading Ridges http://www.grida.no/publications/shelf-last-zone/
Magmatic Plateaus http://www.grida.no/publications/shelf-last-zone/
Seabed Jurisdiction The Area 53 % EEZ 39 % OCS submissions 7 % OCS in PIDs 1 % http://www.grida.no/publications/shelf-last-zone/
Summary Most frequent features submitted for Shelf plateau areas Magmatically influenced continental crust features Fracture zones and seamounts Sediment fans and wedges Low expectations for HC resources in OCS, except on some large continental plateaus Geotopes included in submissions are probably mostly in favour of FMC, less of SMS, and least of PMN Acreage under current submissions for OCS amounts to 7-8 % of total seabed