Characterization of heterogeneous near-surface geology
A key challenge in reservoir characterization with onshore seismic data is accurately compensating for the extreme horizontal and vertical velocity variations and the complex surface wave noise contamination that result from the highly heterogeneous near-surface geology.
Conventional processing philosophy has regarded these surface waves as unwanted coherent noise and removed them at the earliest opportunity. These attempts have met with variable and typically little success in the presence of highly spatially aliased and complicated multimode scattered ground roll.
SWAMI surface wave analysis, modeling, and inversion enables extraction of the phase velocity characteristics per frequency from the surface waves to facilitate both velocity model building and advanced coherent noise attenuation.