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Challenging Data Quality but Superb Reservoir Property EstimationNormal access

Authors: C. E. Krohn and T. Clarke
Event name: EAGE Vibroseis Workshop - Vibroseis acquisition and processing half century later, new developments in data quality and productivity
Session: Session 4: Case Histories
Publication date: 13 October 2008
DOI: 10.3997/2214-4609.20147524
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 251.16Kb )
Price: € 20

Summary:
We have obtained a superb 3D image of reservoir porosity from seismic data recorded in a
very challenging data quality area. To mitigate the strong ground roll, vibroseis data was
acquired with 10-m source intervals using HFVS (High Fidelity Vibratory Seismic), saving
$3 million over conventional methods. As part of the HFVS method, the ground-force signal
was recorded for every shot and used for source separation and deterministic deconvolution.
This minimizes coupling variations and increases wavelet stability and phase control. After
processing, the potential for bandlimited reservoir property inversion was evaluated. The
rock physics analyses were particularly favorable with clear separation of sands and shales. A
wavelet derived from the vibrator wavelet gave excellent well ties for the angle stacks and
was used for spectral balancing. After band-limited inversion, the resulting seismic porosity
and shale predictions are an excellent match to well logs, and the resulting porosity image of
the reservoir clearly portrays the fluvial deposition (Figure 1).


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