Seis Line – QC services – Editing

Seis Line QC – Editing

The results of the data QC analysis will often require the analyst to perform editing tasks to correct outliers / blunders or similar errors found within the data.  Advantage is made of the editing tools to make required changes.  These will include, but will not be limited to:

  • Renaming lines and event numbers
  • Deleting lines and events
  • Editing positions / spike removal
  • Interpolation through gaps
  • Extrapolation at start and end of lines
  • Copy and Paste functions
  • Editing CRS assigned to the data during data loading

 

Gaps will be interpolated or extrapolated using the tools provided.  These will create replacement event numbers and positions based upon the event intervals and numbers found either side of the data gaps.  Care will be required, particularly with land data, to ensure that the gaps are not real and were caused by the seismic line passing through a geographical area where acquisition was not possible or permitted.  For example, through a land or across terrain where neither vibroseis or dynamite could be used as a seismic source.

 

Frequently, the names applied to the seismic lines will be inconsistent or will not meet internal company policy.  The analyst will change any line names to meet requirement of company policy.  This often entails adding prefixes or suffixes to the line names.

 

Errors relating the coordinate reference system definitions must be addressed to ensure integrity within the geo-spatial referencing of the event positions.  Where both geographic and projected coordinates are available for each event it will be possible to determine if the CRS assigned to the data (as part of the data loading process) was correct by applying a coordinate operation between the geographic and projected coordinates.  Where inconsistency of definition are identified these will be corrected by the analyst to remove any ambiguity.

 

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