Integration of the life of field seismic data with the reservoir model at the Valhall Field
2011
The frequent time-lapse observations from the life of field seismic system across the
Valhall field provide a wealth of information. The responses from the production
and injection wells can be observed through time-shift and amplitude changes. These
observations can be compared to modelled synthetic seismic responses from a reservoir
simulation model of the Valhall Field. The observed differences between the
observations and the modelling are used to update and improve the history match of
the reservoir model. The uncertainty of the resulting model is reduced and a more
confident prediction of future reservoir performance is provided.
A workflow is presented to convert the reservoir model to a synthetic seismic
response and compare the results to the observed time-lapse responses for any time
range and area of interest. Correlation based match quality factors are calculated to
quantify the visual differences. This match quality factor allows us to quantitatively
compare alternative reservoir models to help identify the parameters that best match
the seismic observations.
Three different case studies are shown where this workflow has helped to reduce
the uncertainty range associated with specific reservoir parameters. By updating various
reservoir model parameters we have been able to improve the match to the
observations and thereby improve the overall reservoir model predictability. The examples
show positive results in a range of different reservoir modelling issues, which
indicates the flexibility of this workflow and the ability to have an impact in most
reservoir modelling challenges.
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