Unconventional processing of near-surface seismic data is often required because shallow sub surfaces can be characterized by high velocity gradients and complicated structures.
Absolute Imaging has experience processing many shallow seismic reflection data sets. These types of surveys usually involve imaging topography and internal structures within bedrock less than 100 metres below ground surface or water-bottom. A number of these surveys are in shallow marine environments with water depths less than 5 meters.
Absolute Imaging has developed a comprehensive processing flow using internally developed techniques. Included in this flow are effective Rank-Reduction-Based (Cadzow) noise attenuation techniques for suppressing random noise as well as Eigenimage CNA for suppressing linear (shot-generated) noise. Careful attention to Deconvolution parameter selection and offset muting selection, as well as extremely dense velocity analysis, also augments Absolute’s ability to accurately image shallow structures. These targets are often of interest to oil sands operators to assist in mine development planning and for engineering firms specializing in the construction of pipelines, who need to identify potential hazards including faults and irregular structures within bedrock.
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