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


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