RT Journal Article SR Electronic(1) A1 Corzo, Margarita A1 MacBeth, Colin A1 Barkved, OlavYR 2013 T1 Estimation of pore‐pressure change in a compacting reservoir from time‐lapse seismic data JF Geophysical Prospecting, VO 61 IS 5 SP 1022 OP 1034 DO https://doi.org/10.1111/1365-2478.12037 PB European Association of Geoscientists & Engineers, SN 1365-2478, AB ABSTRACT An approach is developed to estimate pore‐pressure changes in a compacting chalk reservoir directly from time‐lapse seismic attributes. It is applied to data from the south‐east flank of the Valhall field. The time‐lapse seismic signal of the reservoir in this area is complex, despite the fact that saturation changes do not have an influence. This complexity reflects a combination of pressure depletion, compaction and stress re‐distribution throughout the reservoir and into the surrounding rocks. A simple relation is found to link the time‐lapse amplitude and time‐shift attributes to variations in the key controlling parameter of initial porosity. This relation is sufficient for an accurate estimation of pore‐pressure change in the inter‐well space. Although the time‐lapse seismic estimates mostly agree with reservoir simulation, unexplained mismatches are apparent at a small number of locations with lower porosities (less than 38%). The areas of difference between the observations and predictions suggest possibilities for simulation model updating or a better understanding of the physics of the reservoir., UL https://www.earthdoc.org/content/journals/10.1111/1365-2478.12037