Multi-Azimuth Processing
PGS has demonstrated the virtues of multi-azimuth acquisition technology in various difficult geological and structural settings during the last few years.
Multi-azimuth HD3D acquisition and processing is recommended in locations affected by poor target illumination, or ambiguous resolution problems. When appropriate acquisition and processing startegies are applied, multi-azimuth HD3D data can contribute to the following improvements in data quality:
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Multiple attenuation
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Higher signal-to-noise ratio
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Greater spatial continuity of amplitudesIllumination => amplitude consistency
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Resolution in the vicinity of complex faulting
3D surveys acquired in more than one direction are processed to yield one output 3D cube, using an appropriate pre-stack time (PSTM) or depth (PSDM) processing flow.
The following examples are from the Varg field in the North Sea.
Original single-azimuth PSDM result (left) vs. the new multi-azimuth HD3D PSDM result (right).
Amplitude maps at the Base Cretaceous target horizon for the original single-azimuth PSDM result (left) vs. the new multi-azimuth HD3D PSDM result (right).
Single azimuths from the multi-azimuth HD3D PSDM results. Note the difference in event and fault resolution. By the combination of these results using a customized processing approach, PGS yields a superior final result.
