Two-dimensional PP/PS-stereotomography: P- and S-waves velocities estimation from OBC data |
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| Authors: | M Alerini G Lambaré R Baina P Podvin S Le Bégat |
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| Institution: | École des Mines de Paris, Fontainebleau, France;Now at SINTEF Petroleum Research, Trondheim, Norway;Now at Compagnie Générale de Géophysique, Massy, France;OPERA, Pau, France;Now at Geophysical Consulting, Pau, France |
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| Abstract: | We present the extension of stereotomography to P - and S -wave velocity estimation from PP - and PS -reflected/diffracted waves. In this new context, we greatly benefit from the use of locally coherent events by stereotomography. In particular, when applied to S -wave velocity estimation from PS -data, no pairing of PP - and PS -events is a priori required. In our procedure the P -wave velocity model is obtained first using stereotomography on PP -arrivals. Then the S -wave velocity model is obtained using PS -stereotomography on PS -arrivals fixing the P -wave velocity model. We present an application to an 'ideal' synthetic data set demonstrating the relevance of the approach, which allows us to recover depth consistent P - and S -waves velocity models even if no pairing of PP - and PS -events is introduced. Finally, results to a real data set from the Gulf of Mexico are presented demonstrating the potential of the method in a noisy data context. |
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| Keywords: | P waves reflection seismology seismic velocities S waves tomography traveltime |
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