|
2D DC resistivity and induced polarization |
Gravity |
Seismic tomography |
Magnetics |
Resolution |
Station spacing: 1-50m. |
Minimum 20m station spacing. |
Station spacing ~5m. |
Recommended grid spacing 1m-2m. |
Depth |
~ 6*(stn spacing) |
~ 0.2*(total line length) |
~ 25m for this case |
~ 0.2*(max. grid width) |
Information type |
2D section (smooth) |
2D section (blocky) |
2D section (smooth) |
3D model |
Sources of noise |
· Metal within the ground.
· Nearby electrical activity (natural or man-made ).
· Poor electrical contact with the ground. |
· Unknown density anomalies.
· Severe topography.
· Industrial activity. |
· Industrial activity.
· Loose surficial materials. |
· Ferrous objects above or below ground.
· Susceptibility variations in bedrock. |
Recommended deliverables |
· Raw data images.
· 2D inverted section images. |
· Raw data profiles.
· Forward modelled 2D block models . |
· Inverted section of velocities. |
· 3D inversion model. |
Approximate daily productivity |
1 line per day (up to 48 stns) |
30 stns per day |
1 line per day (30 stns) |
4000 stns per day |
Costs per field day* |
$1100 |
$750 |
$1500 |
$500 |
Number of crew |
3 |
2 |
3 |
1 |
Processing & reporting costs* |
$200 per line |
$200 per day of data |
$400 per line |
$200 per day of data |
Total costs of doing a survey can be calculated using a simple spreadsheet
that could look like the following: