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Time lapse seismic monitoring of steam injection for EOR projects

Stathopoulou Aikaterini

Πλήρης Εγγραφή

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Περίληψη

The current thesis is based on a time - lapse synthetic seismic reflection study of a steam injection project in Prinos field, northern Greece. The basic attempt is to investigate whether the synthetic seismic reflection data applied on the surface of the geologic section is capable of detecting changes in the reservoir model, which are provoked by the injected steam within the reservoir formations. Two seismic reflection surveys (2D) are simulated through generation algorithm based on finite differences method. Time-lapse monitoring is comprised of a baseline survey recorded before the onset of the steam injection process, when the reservoir is fully saturated with brine and oil and a monitor survey recorded after a period, when the whole reservoir is steam injected. The final time-lapse seismic section is derived from the subtraction of the two already mentioned seismic surveys. Another way to clarify whether all the reservoir layers are stimulated over their entire length by the injected steam, is to calculate the time lag of the seismic waves caused by the lower seismic velocity of the steam saturated formations. The seismic processing was conducted with the aid of MATLABTM Software.

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