Interferometric Multiple Migration of Union Pacific Data

Drill-bit seismic data can provide valuable information about reflector characteristics and prediction ahead of the drill bit. In this paper, I apply the interferometric migration method, which both includes crosscorrelogram and autocorrelogram migration, to Union Pacific Resources Corporation (UPRC) drill-bit data. Here, the data are recorded on the earth’s free surface while a tri-cone drill-bit and down hole motor were used to drill along a horizontal trajectory at a depth of 9188 ft in the Austin Chalk formation. Crosscorrelogram and autocorrelogram time migration is implemented with a ghost reflection-imaging condition. Both methods do not require the pilot signal and wavelet history. The source position does not need to be known in the crosscorrelogram imaging but does need to known in our version of autocorrelogram migration. Synthetic results verify the validity of the interferometric image obtained from drill-bit data generated by a drill bit moving along a horizontal hole. The resulting migration images of UPRC data are compared with a surface-CDP section adjacent to the well rig. The results show that both the crosscorrelogram and auto-