Methods have been developed in the following areas:
- Incorporation of seismic-derived data in the history-matching process
- A general petro-elastic model, valid for each reservoir under study
- A method to estimate the covariance of seismic-derived data and include this in the optimisation.
These have been implemented in commercial software code. This should result in fewer studies where the history-matching changes to the reservoir simulation model are found to be unacceptable to the geophysicist. It should also result in a reservoir simulation model that has better predictive capabilities.
The functionality has added to the commercial software in two parts:
- The reservoir simulator was extended to calculate seismic-derived properties, such as acoustic impedance, (and their gradients with respect to history-matching parameters) on the simulation grid-cells. This information allows comparison of the simulation model performance with the actual seismic data for the reservoir.
- The computer aided history-matching tool has been extended to incorporate these new properties in a history-matching objective function so that it is used at the same time as the production data in the history-matching process.
The methods and software have been tested on real field cases from the North Sea and the Adriatic Sea.