High-resolution seismic attenuation imaging from wide-aperture onshore data by visco-acoustic frequency-domain full-waveform inversion

摘要: SUMMARY Here we assess the potential of visco-acoustic frequency domain full-waveform inversion (FWI) to reconstruct P-wave velocity (VP) and attenuation factor (Q) from surface onshore seismic data. First, perform a sensitivity analysis FWI based upon grid search misfit function several synthetic examples using Q models increasing complexity. Subsequently, applied both acoustic viscoacousticFWItorealsurfacewide-apertureonshoreseismicdatafromthePolishBasin,wherea strongattenuationoftheseismicdataisobserved.Thesensitivityanalysisofthevisco-acoustic suggests that can jointly if signatureoftheattenuationissufficientlystronginthedata.Asyntheticexamplecorresponding homogeneous background model with an inclusion shows reliable reconstruction VP in inclusion, when is as small 90 50 respectively. A first application real data heuristic normalization offset allows us compensate for effect model. Alternatively, show true-amplitude We propose pragmatical approach modelling source wavelet estimation infer best starting FWI. find quite sensitive quality used estimation. For example, source-to-source wavelets are significantly more consistent computed final than initial one. good kinematic amplitude match between early-arriving phases time-domain seismograms provides additional evidence reliability recovered expected lithology stratigraphy study area. link high-attenuation zones increased clay content presence mineralized fluids.