Editor's note: H. Acevedo is also with Ecopetrol. J. Haataja is now at PGS Geophysical. A. Minaeva is now at Shell Exploration and Production Co.

Why perform time-lapse seismic monitoring? Is it to verify the reservoir model? No! We should conduct time-lapse seismic surveys in order to find out what is incorrect in the reservoir model, in a way similar to the production history matching familiar to reservoir engineers as they look for improvements to the model. This being the case, it is difficult to determine in advance of monitoring just what it is we should be monitoring. Thus, surveys...

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