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Integration Of High Resolution Fwi Velocity Model And Broadband Data For Elastic Property Generation: A Low Frequency Overlap Case Study In The Norwegian Sea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE Conference on Reservoir Geoscience, Dec 2018, Volume 2018, p.1 - 5
Abstract
Obtaining absolute elastic attributes for lithology and fluid prediction requires a low frequency model. This was achieved by collocated co-kriging of seismic velocity and well information. Increasing the bandwidth with broadband seismic only requires a low frequency model for the 0 to 3 Hz range, reducing emphasis on the well information. Less a priori input is advantageous in attribute prediction; the results of pre-stack seismic inversion are primarily data driven. Full waveform inversion (FWI) creates high resolution velocity models. Both high resolution FWI models and broadband seismic data can provide the low frequency component of elastic property generation enabling well information to be a control point; Reservoir geoscientists can confidentially derive reliable elastic attributes such as acoustic impedance and Vp/Vs ratios away from the well locations. We present the results of a study varying the overlap point between a full wavefield FWI model and broadband seismic in an absolute elastic inversion and draw conclusions on the optimal data use for a volume from the Norwegian Sea.