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Abstract: Avoiding Failures in Reservoir Prediction from Seismic

Ferraris, O.; L. Pianelli*, O. Acevedo and D. Lorenzo - YPF

Nowadays it is very common to use amplitude maps as a tool for reservoir prediction. The purpose of this paper is to refresh the memory concerning some tests that should be done to be sure of what we are really measuring. This is especially important in 2D data but also 3D. The first test is to verify whether there are changes in sonic or density well logs. The second test is to view the seismic, looking for changes that we can associate with the first ones, and then verify a relationship with one of the reservoir parameters.

After that, and before mapping, we need to test the measurement conditions: same face, relative amplitude, bandwidth, etc. The face angle must be measured, homogenized (in 2D) and rotated to zero face specifically for the event under study, or another one that is closer to it, and checked by synthetic traces.

In 2D data, the need is to measure and homogenize amplitudes between lines and the bandwidth, especially if our event can be inferred for lateral lobes from other stronger events.

The increment in the bandwidth by processing must also be tested by synthetic data. Finally, in the interpretation step of 2D data, or a mixed set, a new line by line correction of amplitude, face and time needs to be carried out. Another instructive test is a 2D or 3D seismic modeling showing an image of the wavelets interaction and the changes looked for.

AAPG Search and Discovery Article #90933©1998 ABGP/AAPG International Conference and Exhibition, Rio de Janeiro, Brazil