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Surface-Wave Analysis and Inversion of Ambient Noise RecordingsNormal access

Authors: C. Leone, D. Boiero and S. Mitchell
Event name: 80th EAGE Conference and Exhibition 2018
Session: 4D Analysis and Evaluation I
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800697
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 500.76Kb )
Price: € 20

A new approach is proposed to estimate the S-wave velocity of the near surface (and its changes over time) from passive data. The method consists of 5D interpolation followed by surface-wave analysis and inversion. This allowed us to overcome the issue of velocity estimation in between detector cables avoiding the phase velocity tomography step. The method was tested on virtual shots generated by interferometry techniques applied on ambient noise recorded at the Valhall Life of Field Seismic permanent monitoring network. Maps of the phase velocities allowed identifying several geological features in the near surface. A time-lapse analysis was also performed and the changes in S-wave velocity shows correlation to the 4D time shifts from converted-wave data.

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