Shallow gas
The dataset is a collection of landforms and phenomena in and on the seabed caused by natural gas in the seabed sediments. Shallow gas can originate from both sedimentary rocks and overlying sediments. Typical landforms are pockmarks and diapirs, but shallow gas are also displayed as strong reflectors (bright spots) or gas blanking on seismic profiles. Gas leakage from the seabed has great ecological significance for plant and animal life in the sea, e.g. it is typical with bacterial mats occur around such places. Gas and gas hydrates in the sub-seabed sediments also have an impact on seabed stability and climate change.
Simple
- Date (Creation)
- 2000-11-09
- Date (Publication)
- 2009-11-09
- Date (Revision)
- 2021-01-12
- Unique resource identifier
- grunngass
- Purpose
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The dataset shows the distribution of landforms and phenomena in and on the seabed caused by gas in sedimentary rocks or in overlying sediments. Although not all sea areas have been mapped in detail and thoroughly, we see that shallow gas-related landforms and phenomena are very common, especially in the sea areas, but also along the coast and in many fjords. Shallow gas must be taken into account in development and installations, as well as environmental studies and evaluation of the ecosystem.
- Status
- On going
- Maintenance and update frequency
- As needed
- GEMET - INSPIRE themes, version 1.0
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Geologi
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Områder med naturbetingede farer
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- Nasjonal inndeling i geografiske initiativ og SDI-er
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Norway Digital
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Mareano
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MarineGrunnkart
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- Place
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Norge
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Barentshavet
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Norskehavet
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Nordsjøen
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- Theme
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sea bottom
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marine
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diapir
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mud volcano
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natural gas
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bright spots
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pockmark
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gas blanking
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gas hydrat
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geohazard
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stability
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shallow gas
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climate
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ecology
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hydrocarbon
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- Keywords
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NGU
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MAREANO
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Marine basemaps
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- Specific usage
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Gas hydrates and shallow gas have an impact on seabed stability, climate change and ecological diversity on the seabed, at the same time when it is considered as a geological resource due to its high methane content. The knowledge on these can be used by the oil industry in hydrocarbon exploration.
- Use limitation
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Detaljnivået på datasettet tilsier bruk innenfor kartmålestokken: 1:100.000 - 1:500.000.
- Access constraints
- Other restrictions
- Other constraints
- Åpne data
- Use constraints
- Other restrictions
- Other constraints
- Norsk lisens for offentlige data (NLOD)
- Classification
- Unclassified
- Spatial representation type
- Vector
- Denominator
- 5000, 100 000, 500 000, 2 000 000
- Metadata language
- Norwegian
- Topic category
-
- Geoscientific information
))
- Begin date
- 0001-01-01
- Supplemental Information
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The source data for interpretation for this data set is mainly detailed bathymetry data and seismic. The degree of detail and which phenomena have been mapped vary considerably from place to place.
- Unique resource identifier
- EPSG:4326
- Unique resource identifier
- EPSG:32632
- Unique resource identifier
- EPSG:32633
- Unique resource identifier
- EPSG:32635
- Distribution format
-
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Shape
()
Distributor
- Units of distribution
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Hele landet
- OnLine resource
- https://geo.ngu.no/mapserver/MarinGeofarerWMS?REQUEST=GetCapabilities&SERVICE=WMS ( OGC:WMS )
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FGDB
()
Distributor
- Units of distribution
-
Hele landet
- OnLine resource
- https://geo.ngu.no/mapserver/MarinGeofarerWMS?REQUEST=GetCapabilities&SERVICE=WMS ( OGC:WMS )
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SOSI
()
Distributor
- Units of distribution
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Hele landet
- OnLine resource
- https://geo.ngu.no/mapserver/MarinGeofarerWMS?REQUEST=GetCapabilities&SERVICE=WMS ( OGC:WMS )
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Shape
()
- Units of distribution
-
Hele landet
- OnLine resource
- https://geo.ngu.no/mapserver/MarinGeofarerWMS?REQUEST=GetCapabilities&SERVICE=WMS ( OGC:WMS )
- Hierarchy level
- Dataset
Conformance result
- Date
- Date
- Explanation
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Angir fullstendighet i forhold til krav fra FAIR-prinsippene (The FAIR Guiding Principles for scientific data management and stewardship)
- File identifier
- 40b986b6-aff3-47b6-8b01-d989332f83cf XML
- Metadata language
- Norwegian
- Hierarchy level
- Dataset
- Date stamp
- 2023-12-04
- Metadata standard name
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ISO19115
- Metadata standard version
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2003
Overviews
Spatial extent
))
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