QC Process

QC Process

1. De-multiplexing : The data is transposed from the recording mode, where each record contains the same time sample from all receiver, to the trace mode where each record contains all time samples from one receiver. (done in field)

2. Reformatting: The data is converted from one seismic digital format (e.g., SEG-Y) to another format that is convinient to the processing software and used throughout the processing flow (e.g., MATLAB)

3. Setup of filed geometry: The geometry of the field is written into the data (trace headers) in order to associate each trace with its respective shot, offset, channel, and CMP.

4. Trace editing: During this step, bad traces, or parts of traces, are muted (zeroed) or killed (deleted) from the data and polarity problems are fixed.

5. Gain Application: Amplitude correction are applied to account for amplitude losses due to sphericcal divergence and absorption

6. Application of field statics: In land surveys, elevation statics are applied to bring the sources and receiver =s to acommon datum level. This step can be delayed until the static correction process where better near-surface velocities might be available.