Comparison of Sensitivity Coefficient Calculation Methods in Automatic History Matching
- Creators
- Dogru, Ali H.
- Seinfeld, John H.
Abstract
The efficiency of automatic history matching algorithms depends on two factors: the computation time needed per iteration and the number of iterations needed for convergence. In most history matching algorithms, the most time-consuming aspect is the calculation of the sensitivity coefficients – the derivatives of the reservoir variables (pressure and saturation) with respect to the reservoir properties (permeabilities and porosity). This paper presents an analysis of two methods – the direct and the variational – for calculating sensitivity coefficients, with particular emphasis on the computational requirements of the methods. If the simulator consists of a set of N ordinary differential equations for the grid-block variables (e.g., pressures) and there are M parameters for which the sensitivity coefficients are desired, the ratio of the computational efforts of the direct to the variational method is R = [N(M + 1)]/[N(N + 1) + M•] Thus, for M
Additional Information
© 1981 Society of Petroleum Engineers.Additional details
- Eprint ID
- 120838
- Resolver ID
- CaltechAUTHORS:20230413-768733000.12
- Created
-
2023-04-19Created from EPrint's datestamp field
- Updated
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2023-04-19Created from EPrint's last_modified field
- Other Numbering System Name
- SPE Paper
- Other Numbering System Identifier
- 8251-PA