Conventional marine sources release most of their energy almost instantaneously. Marine resonators (or vibrators) inject energy into the water in a steady fashion over an extended time interval (like conventional vibrators on land). The main difference is that unlike in the land case, the seismic vessel is moving at around 4.5 knots while emitting its energy. Depending on the length of the source excitation, the source “location” could span several hundred feet. Failing to account for the motion of the source will produce frequency-dependent traveltime errors. Here we show that for sources with duration of tens of seconds, like Wolfspar, the errors are not negligible even over a narrow frequency band for inversion methods like full-waveform inversion (FWI). If source-related errors are not accounted for in the inversion, the FWI engine will attempt to explain them through model updates. This slows down the convergence of the algorithm and can produce erroneous results.
Presentation Date: Tuesday, October 13, 2020
Session Start Time: 9:20 AM
Presentation Time: 11:00 AM
Location: Poster Station 3
Presentation Type: Poster
