In a time-lapse 3-D seismic (TL3D) project, a “monitor” seismic survey is compared to a “base” survey. Ideally, the base survey is a 3-D data set acquired before production from the field started. Normally, the monitor survey is acquired after several years of production. The observed differences between the base and the monitor survey can be interpreted in terms of changes in fluid saturation and pressure.

When embarking on a seismic monitoring project, it is important to keep the following questions in mind:

In this article, we will answer these questions and illustrate our solutions with two examples.

Fluid drainage...

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