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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)
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
N
S
E
W
thumbnail




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.

Metadata

File identifier
40b986b6-aff3-47b6-8b01-d989332f83cf XML
Metadata language
Norwegian
Parent identifier
Grunn gass

576bb3f5-725d-443b-b1be-601b2f8a5aa4

Hierarchy level
Dataset
Date stamp
2025-05-08
Metadata standard name

ISO19115

Metadata standard version

2003

Metadata author
Organisation name Individual name Electronic mail address Role

Geological Survey of Norway

Janne Grete Wesche

metadataansvarlig@ngu.no

Point of contact
Other language
Language Character encoding
English UTF8
 
 

Overviews

overview
original
overview
miniatyrbilde
overview
medium
overview
dekningsoversikt

Spatial extent

thumbnail

Keywords

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


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