Using Supervirtual Refraction Interferometry to Enhance First Arrivals of Seismic Data from Saudi Arabia
The objective of this study is to test the feasibility of using the supervirtual seismic interferometry method for enhancement of first arrivals in petroleum seismic data.I develop a workflow that consists of: wavefield separation, crosscorrelation, source stacking, convolution, and receiver stacking. The workflow is tested on a synthetic data set with noise properties similar to those encountered in common 2-D acquisition geometries.I also test the workflow on a 2-D seismic data set from Saudi Arabia having considerable attenuation of first arrivals with offset. Results show that the workflow greatly enhances the first arrivals at all offsets, particularly at far offsets.
In addition, I look closely to the effect of the workflow on the wavelet shape andfind that although the amplitude spectrum of the wavelet changes, its phase spectrum and dominant frequency are the same as those of the wavelet. I also test the effect of a fixed noise source on the method and conclude that it does not affect the quality of the resulting first arrivals. Finally, I test the effect of window size in the wavefield separation step of the workflow and find that it does not affect the results as long as the window does not include large amounts of ground roll.
AAPG Search and Discovery Article #90188 ©GEO-2014, 11th Middle East Geosciences Conference and Exhibition, 10-12 March 2014, Manama, Bahrain