EAGE/SPE Joint Workshop - Well Testing and Seismics

In the emerging West Africa deep offshore region, where exploration is booming, the
turbiditic series reservoirs are mostly structurally trapped with a stratigraphic component.
Faulting is severe inducing high compartmentalisation. Evaluation of connectivity and
characterisation of the reservoir heterogeneities before development decisions are the main
challenges.

The classical application of 4D seismic is to monitor a field for a given scheme of development.
This can be done at discrete time intervals or in a pseudo-continuous way like in the LOFS
acquisition design. The latter application is only feasible for limited area and in marine
environment due to the cost of on shore sources.

A method is proposed which identifies areas in the 4D seismic response which directly
correlate with well activity, and hence are consistent with the reservoir engineer’s
understanding of the field.

The presentation will show various cases from around the world where stand alone
information from one of the main data catagories (Seismic, Well Test, Logs and Core)
leads to an incorrect interpretation.

Test interpretation may result in no-flow boundaries. These are deviation from radial flow
in a pancake model and can be attributed to changing kh product or barriers in the reservoir
like a faults or sedimentological events (e.g. sand pinchout).

In this large carbonate platform reservoir, there are two distinct regions identifiable from
seismic data: platform interior and raised margin.

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