| 4D Feasibility Studies |
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| Survey Design Before planning a 4D survey it is first necessary to assess whether the 4D signal generated by production effects in the reservoir will be detectable. Rock physics analysis is performed, where the effect of different production scenarios on the reservoir and resulting seismic properties are quantified. After confirming that the reservoir will give a suitable response for 4D seismic monitoring, survey design can begin. This aims to maximize the strength of the observed 4D signal by optimizing reservoir illumination and maximizing repeatability of successive surveys. With the use of synthetic data from the rock physics modelling, processing challenges can also be anticipated. Planning and Simulation Using the feasibility study CGGVeritas can:
Simulator to Seismic Equivalent predictions can be made for stress using a geomechnical simulation. Petrophysical relationships are then used to translate reservoir properties into the elastic attributes (P- and S-wave velocity and density) required for seismic modelling. |
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Feasibility studies bring reservoir engineering and geophysics expertise together. Flow simulation is often the first step in the generation of synthetic 4D seismic data. It is used to predict reservoir properties (such as pressure and fluid saturation) at some future point in the production history of the field.