Sub-thrust imaging over the Timor Trough using broadband seismic, full waveform inversion and fault constrained tomography

Thrust complex imaging in the Timor Trough suffers from the fault shadows due to strong lateral velocity variation. We demonstrate a new workflow to tackle this. Broadband seismic data were acquired with high signal-to-noise ratio of low frequency. With broadband input, full waveform inversion (FWI) derived better velocity model at the shallow water thrust area where the reflection tomography has limitation. Compared to conventional tomography which has difficulty in addressing the sharp velocity boundary properly, fault constrained tomography (FCT) uses the interpreted fault planes as constraint for inversion and benefits from better low frequency penetration in the severe fault shadows. Broadband seismic and depth imaging with FWI and FCT make a step change over the thrust complex areas.