A Method For Shot Location Correction In Seismic Geometry

Establishing an accurate dimensional attribute is most important for the baseprocessing of seismic data. There are often somewhat difference between the real shotlocation and recorded shot location due to the ground surface condition limits andpersonal errors during the field work. In general situation, the shot location correctionmust be done before the base processing.There have been some methods of shot location correction proposed for theseismic data processing. An more accurate method of shot location correction is givenin this paper. The primary principle of this method is based on the "moving average" .At first, we need to calculate the medium velocity near the ground surface and find outthe mathematical relation between the shot locations and receiver stations with theleast squares fitting principle from the 2-D shot coordinates file saved in computer.Based on these results, we are able to figure out the corresponding geometry relationbetween the inspecting shot and receiver locations with the method of moving averageto correct the recorded shot location data. For the 3-D data, the corrections are alsobased on the method of moving average. However, the 3-D data processing needs G-Siterative in order to gain the accurate coordinates of shot locations. Actually, most current softwares used for seismic data processing, such as: CGG,FOCUS, PROMAX, lack for the module of the shot location correction, that is given inthis paper. It is obvious that this method plays a significance role for the processing ofseismic exploration signal.