A practical acoustic full waveform inversion workflow applied to a 3D land dynamite survey

Abstract

Full waveform inversion (FWI) has been used to successfully build high-resolution earth velocity models for marine data. For land data sets, FWI using acoustic wave equation (acoustic-FWI) remains challenging due to the lack of modeling of strong surface waves, converted waves, phase dispersion, and near-surface weathering layer distortion. In addition, for land dynamite surveys, the source wavelet information is usually missing, and the recorded individual waveform varies greatly because of the spatially variant shot characteristics such as source charge size, shot depth, and hole-pattern as well as the distortion caused by the near-surface weathering layer. We designed and implemented a practical and comprehensive workflow to mitigate missing source wavelet information and vast spatial variation in the waveforms and to address the common challenges of acoustic-FWI application on land surveys during field data preparation.

A review on reflection-waveform inversion

“…BGP created an onshore controlled vibrator source, which can produce low frequencies as low as 1.5 Hz (Baeten et al 2013). Unfortunately, so far not many successful FWI examples on land seismic data have been reported due to some complex factors, including low SNR, surface waves, near-surface heterogeneity and elastic effects (Mei and Tong 2015;Cheng et al 2017;Sedova et al 2019).…”