Geometry Compensating DGF

DGF optimized for highly irregular acquisition configurations

Noise attenuation routines applied early in the land seismic processing sequence often assume data are recorded on a regularly spaced grid. However, this is rarely the case for either Q-Land or conventional land seismic data acquisition. In these circumstances unwanted noise may leak out of the reject zone of array-forming filters, while the amplitude and phase characteristics of the filter may also become distorted.

WesternGeco has developed the geometry compensating DGF technique to improve noise attenuation in areas where a regular field layout is compromised. Ideal spatial filters are translated onto the irregular grid of the single-sensor data and a new filter designed for each data location. Geometry compensating DGF, therefore, compensates for amplitude and phase variations caused by sub-optimal geometric layout, minimizing noise while preserving inherent signal characteristics.

Geometry compensating DGF requires each detector in an array to be recorded separately. As such, it cannot be effectively applied to conventional acquisition configurations, but is ideal for integration into a Q-Land processing sequence.