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Time-lapse seismic has been successful in many offshore applications, but it has been much more cumbersome when applied onshore. Successful applications are observed mainly for shallow objectives and large acoustic impedance changes, such as thermal EOR and CO2 injection. The dominant problems for onshore time-lapse are caused by near-surface variations between base and monitor surveys.1 Appropriate measures, taken in acquisition and processing, makes it possible to overcome these problems. This article demonstrates a continuous, seismic time-lapse field trial in Schoonebeek, The Netherlands, where thermal EOR is applied. These time-lapse measurements not only allow the observation of pressure and temperature variations in the reservoir, but also to quantify these variations. These measurements complement the measurements made in wells, enabling the reservoir engineer to construct more accurate dynamic models, which make it possible to make better reservoir management decisions.
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