Amplitude attenuation and phase distortion of seismic data are byproducts of the Earth’s anelasticity (Q). These effects are exacerbated under regions of anomalously high absorption, such as shallow gas, causing uneven image illumination and migration artifacts. We present a case study from the Northern Viking Graben in the Norwegian North Sea where we utilize single-iteration least-squares visco-acoustic prestack depth migration (Q-LSPSDM) to produce a stable Q-compensated image. The migration used high-resolution p-wave velocity and attenuation models, derived from visco-acoustic full-waveform inversion (QFWI). We show this workflow compensates locally for amplitude loss, eliminates the need for a Q-compensation amplitude gain limit, and enhances illumination, event coherency and AVO attributes, while reducing noise.
Presentation Date: Wednesday, October 17, 2018
Start Time: 8:30:00 AM
Location: 207A (Anaheim Convention Center)
Presentation Type: Oral
