Abstract

Digital sensors meant for acquiring full wave seismic data has the potential to better image reservoir with broader bandwidth and high resolution over the data with analog sensors. A 2D seismic profile was shot to record data simultaneously with digital and analog sensors in Kadi area of Cambay Basin to make a comparative study of the digital sensors (Vectorseis) over analog sensors (SM-24). All the acquision parameter were kept same to acquire the data so as to have a meaningful analysis (fig.2). The wider bandwidth of signal recorded by digital sensors including the very low frequency signals of the range 1-8 hz, were preserved throughout the processing flow, which helped improving the resolution. To attenuate low frequency shot generated noise, instead of frequency filter, f-k filter was used. Use of an identical processing flow, with carefully preserving the signal bandwidth at every stage of processing, the processed output clearly indicates better resolution in the case of digital sensors over that of analog sensors. The effect is spectacular in the shallower part of the recorded data.