Acoustic waveform tomography of elastic wavefields: Application to marine OBS data

Kamei, Rie; Pratt, G.

doi:10.3997/2214-4609.20149928

72nd EAGE Conference and Exhibition - Workshops and Fieldtrips 2010

DOI: 10.3997/2214-4609.20149928

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Acoustic waveform tomography of elastic wavefields: Application to marine OBS data

Rie Kamei¹,

G. Pratt²

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2012

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Waveform tomography of field vibroseis data using an approximate 2D geometry leads to improved velocity models

Smithyman

Clowes

2012

GEOPHYSICS

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Waveform tomography, a combination of traveltime tomography (or inversion) and waveform inversion, is applied to vibroseis first-arrival data to generate an interpretable model of P-wave velocity for a site in the Nechako Basin, south-central British Columbia, Canada. We use constrained 3D traveltime inversion followed by 2D full-waveform inversion to process long-offset (14.4 km) first-arrival refraction waveforms, resulting in a velocity model of significantly higher detail than a conventional refraction-statics model generated for a processing workflow. The crooked-line acquisition of the data set makes 2D full-waveform inversion difficult. Thus, a procedure that improves the tractability of waveform tomography processing of vibroseis data recorded on crooked roads is developed to generate a near-surface ([Formula: see text]) velocity model for the study area. The data waveforms are first static corrected using a time shift determined by 3D raytracing, which accounts for the crossline offsets produced by the crooked-line acquisition. The velocity model generated from waveform tomography exhibits substantial improvement when compared with a conventional refraction-statics model. It also shows improved resolution of sharp discontinuities and low-velocity regions when compared to the model from traveltime tomography alone, especially in regions where the geometry errors are moderate. Interpretation of the near-surface velocity model indicates possible subbasins in the Nechako Basin and delineates the Eocene volcanic rocks of the study area. This approach limits the ability of the full-waveform inversion to fit some propagation modes; however, the tractability of the inversion in the near-surface region is improved. This new development is especially useful in studies that do not warrant 3D seismic acquisition and processing.

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Waveform tomography of field vibroseis data using an approximate 2D geometry leads to improved velocity models

Smithyman

Clowes

2012

GEOPHYSICS

View full text Add to dashboard Cite

show abstract

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Acoustic waveform tomography of elastic wavefields: Application to marine OBS data

Cited by 1 publication

References 0 publications

Waveform tomography of field vibroseis data using an approximate 2D geometry leads to improved velocity models

Waveform tomography of field vibroseis data using an approximate 2D geometry leads to improved velocity models

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