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.

Date (Creation): 2000-11-09

Date (Publication): 2009-11-09

Date (Revision): 2024-01-30

Code: grunngass_detaljert

Purpose: 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

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Geological Survey of Norway	Aave Lepland	aave.lepland@ngu.no	Publisher
Geological Survey of Norway	Shyam Chand	shyam.chand@ngu.no	Owner

Maintenance and update frequency: As needed

GEMET - INSPIRE themes, version 1.0

Geologi
Områder med naturbetingede farer

Nasjonal inndeling i geografiske initiativ og SDI-er

Norway Digital
Mareano
MarineGrunnkart
Felles datakatalog

Nasjonal tematisk inndeling (DOK-kategori)

Geologi

Place

Norway
Barents Sea
Norwegian Sea
North Sea
Trondheimfjord
Oslofjord

Administrative enheter i Norge

Norge

Theme

sea bottom
marine
diapir
mud volcano
natural gas
bright spots
pockmark
gas blanking
gas hydrat
geohazard
stability
shallow gas
climate
ecology
hydrocarbon

Keywords

NGU
MAREANO
Marine basemaps

Spatial scope

National

Specific usage: 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.

User contact info

Organisation name	Individual name	Electronic mail address	Role
			Owner

Use limitation: 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

Language: Norwegian

Topic category

Geoscientific information

Supplemental Information: 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

Unique resource identifier: EPSG:25832

Unique resource identifier: EPSG:25833

Unique resource identifier: EPSG:25835

Distribution format

Name	Version
FGDB
GML
SOSI
FGDB
GML
SOSI
FGDB
GML
SOSI

Units of distribution: landsfiler

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-http--download	https://geo.ngu.no/download/order?dataset=713

Hierarchy level: Dataset

Conformance result

Title: SOSI produktspesifikasjon: Grunn gass

Date (Publication)

Title: sosi

Date

Explanation: The data is not evaluated according to the product specification

Completeness omission

Name of measure: Prosentvis oppfyllelse av FAIR-prinsipper

Measure description: Angir fullstendighet i forhold til krav fra FAIR-prinsippene (The FAIR Guiding Principles for scientific data management and stewardship)

Quantitative result

Value: 88

Statement: The data set has been interpreted and digitized by NGU, but the interpretations are based on data from the Geological Survey of Norway (NGU), the Norwegian Mapping Authority (SKS), the Norwegian Petroleum Directorate (NPD), Institutt for Kontinentalsokkelundersøkelser (IKU, present SINTEF), and previous interpretations and scientific publications. Various basic gas-related landforms and phenomena are described with SOSI codes. Among other things, it is stated whether the phenomenon can be seen on the seabed or whether it is buried or observed in sedimentary rocks / sediments.