Abstract
Next-generation seismic experiments – II: wide-angle, multi-azimuth, 3-D, full-waveform inversion of sparse field data
Highlights
Practice within the petroleum sector has been transformed since the development of 3-D full-waveform inversion (3-D FWI)
The purpose of this paper is to demonstrate that 3-D FWI, a technology developed for the petroleum industry, can be applied to sparse marine seismic data sets that are typically acquired in scientific investigations of crustal targets
The inverted velocity anomalies in the final FWI model are roughly 2–4 times finer than can be recovered using traveltime tomography. This improvement in resolution demonstrates that 3-D FWI can be used to recover fine-scale structure within the crust even when data are acquired using a relatively sparse shot and receiver spacing
Summary
Practice within the petroleum sector has been transformed since the development of 3-D full-waveform inversion (3-D FWI) This technology is commonly used to obtain fine-scale models of P-wave velocity which, when used in pre-stack or reverse-time depth migrations, lead to a significant improvement in reflection images Synthetic tests were used to assess the potential of 3-D, wide-angle, long-offset, low-frequency FWI as a tool to determine P-wave velocity structure to address scientific targets (Morgan et al 2013). We apply this technology to a marine seismic data set acquired across an active ocean-spreading centre, using airgun shots and ocean-bottom seismometers (OBS).
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