SOSI code
| Symbol | Shallow gas SOSI code |
Code name | Description |
|---|---|---|---|
|
1 | Bottom simulating reflector BSR | Areas where BSR (Bottom Simulating Reflector) is identified on seismic profiles that indicates presence of shallow has or gas hydrates in sediments. |
|
2 | Shallow gas in bedrock | Areas where shallow gas is identified in bedrock. |
|
3 | Shallow gas in sediments | Areas where shallow gas is identified in sediments. |
|
4 | Fluid escape | Areas where fluid (gas or liquid) seepage is identified on seafloor.. |
|
5 | Bright spots | Areas with anomalously high reflection amplitudes on seismic profiles that can indicate occurrence of hydrocarbons. |
|
7 | Diapirs | Areas with diapirs/domes, formed due to upward movement of rock/sediment/fluid and protrudes through overlying strata. |
|
Diapirs (under seabed) | ||
|
| Diapirs (observed on seismic lines) | ||
|
8 | Pockmark area | Areas where depressions/craters (pockmarks) have formed at sediment surface due to seepage of fluid (gas or liquid) from underlying sediments. |
|
9 | Area of a singel pockmark | Area of individual depression/crater (pockmarks), formed at sediment surface due to seepage of fluid (gas or liquid) from underlying sediments. |
|
10 | Gas blanking | Areas where reflectors on seismic profiles are blanked due to gas in sediments. |
|
11 | Gas hydrate stability zone | Areas where gas hydrates in seafloor sediments are stabile. Contour lines show the thickness of gas hydrate stability zone below the seafloor. |
|
12 | Mud volcano | Formation on seabed/earth surface created by geoexuded mud or slurries, water and gases. |
|
| 13 | Evacuation crater (on the seabed) | Crater in or on the sea floor created by explosive escape of gas. |
|
| Evacuation crater (under seabed) |
| Last updated 28.09.2023 |
| NGU Mareano |