Abstract
Summary Additional insight into the interaction between pressure and fluid saturation changes within the reservoir can be extracted through discrimination of time lapse (4D) signal from PP and PS data. Previous processing of the 4D PP dataset over the Edvard Grieg field from 2016 to 2022 yielded interpretive saturation related 4D changes due to production and injection. The PS radial data followed, centred on a co-processed up/down deconvolution (referred to here as radial/down deconvolution for PS) workflow in alignment with the PP route. The result was a unique 4D PS response to that of PP due to changes being pressure related. The UDD workflow involved spectral division of the radial with the downgoing wavefield in the 3D tau,p,q domain. The output was shaped to a user-defined wavelet and 3D deghosted. Although the condensed and optimised deconvolution process requires minimal processing, the result is sensitive to instrument calibration, source variability, and spatial sampling. Performing joint PP-PS tomography provided an uplift in depth-domain event alignment, which helped to correlate structural boundaries with the extracted 4D attributes. The 4D PS result correlates well with the predicted model and the low frequency response was observed to be significantly improved over the legacy processing route.
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