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Elevation Errors

Geoid Heights incorrectly applied.

 

Corrected Elevations are shown.

From a seismic imaging perspective these sort of bulk shift errors, in general, will be detected by the seismic processing contractors as part of their normal routine. However, their corrections may not be the best possible solution to the elevation errors as they are forced to make the best of what they are given with location data. This type of error also adds to the burden of pre-processing and quality assurance and are easily corrected with survey audit - improving processing flows and ensuring the integrity of the location data to start with.

Case Studies

seismic line superimposed on topo map

2D Survey Error

2D Survey Error in Northwest Colorado reveals discrepancies between client file and field notes

3d seismic survey info superimposed on aerial photograph

3D Survey Error

3D Survey Error causing the company to drill three times unsuccessfully into the wrong side of the fault line.

3d seismic info superimposed on aerial potograph

3D Survey Error

3D Survey Error due to the wrong datum and projection

well location data superimposed on aerial photo

Well Location Differences

Well Location Differences of two published locations of a well, in comparison to the correct re-surveyed well location.

well location data superimposed on aerial photo

Well Location Differences

Well Location mistie of 1044 feet from the published location of the re-surveyed well location.

well location info superimposed on aerial potograph

Well Location Differences

Well Location discrepancies showing 41% of re-surveyed wells in a given area have horizontal errors and 31% have vertical errors to the client's database well locations.

elevation error map

Elevation Errors

Elevation errors due to bad rod heights and poor GPS measurements.

elevation error map

Elevation Errors

Elevation errors due to incorrectly applied Geoid heights.

 

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