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A Pragmatic Approach to Seismic Signature InversionNormal access

Author: C.A. Cunha Filho
Event name: Second EAGE/SBGf Workshop 2014
Session: Session III - Processing II
Publication date: 04 November 2014
DOI: 10.3997/2214-4609.20147400
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 421.61Kb )
Price: € 20

Summary:
We adopt a five-step statistical-deterministic approach to deconvolve the seismic signature. The process compensates for phase and amplitude distortions related to the source signature, the recording devices, and source and receiver ghosts. First we estimate the recorded seismic pulse. Then, an inversion procedure estimates two sets of ghost related parameters (sea surface reflectivity, depth and depth uncertainty), one set for the source and one for the receiver. In the process, a residual pulse is estimated as well. The third step comprises a ω-k domain deconvolution of the ghosts, which partially accounts for incidence/emergence angles. In the following step an inverse filter of the residual pulse of step 2 is applied. The final step consists of predictive deconvolution with unitary prediction length. This approach was applied to conventional streamer data from Santos Basin. The inversion process for estimation of the ghost parameters gave similar results for different sets of initial parameters. Application of the three-step deconvolution (Deghost + Inverse Filter + Decon), using the estimated parameters and residual pulse from the two-step inversion process show significant spectral broadening (especially on the low frequency region, thus improving the temporal resolution of the data.


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