Estimation of remaining oil reserves based on multilevel modeling
UDC: 622.27
DOI: -
Authors:
STEPANOV SERGEY V.
1,2,
ZUBAREVA IRINA A.1,2,
ZAGOROVSKY MIKHAIL A.1,2,
LOPATINA EKATERINA S.1
1 Tyumen Oil Research Center, Tyumen, Russia
2 University of Tyumen, Tyumen, Russia
Keywords: facies, multilevel modeling, relative phase permeability, oil production, digital core
Annotation:
The paper presents the results of research on the use of multilevel modeling for estimation of residual oil reserves. Multilevel modeling, as a combination of multi-scale and hierarchical modeling, is implemented by combining a hydrodynamic model and empirical function "cumulative oil production (cumulative liquid production)". In this case, the parameters of the empirical function are calculated based on their relationship with the parameters of the relative phase permeability functions, which are determined for the scale of the facies. To do this, multivariate calculations were performed, which allowed us to establish multi-parametric empirical regression equations in the form of a product of a combination of influencing parameters. Using real field data, it is shown that multilevel modeling allows for a more accurate estimation of residual oil reserves than a hydrodynamic model or empirical function unrelated to each other. This is due to the fact that at the multiscale modeling stage, the effect of the discrepancy between the scale of the core and the computational cells of the hydrodynamic model is eliminated, and at the hierarchical modeling stage, the effect of the uncertainty of the model parameters, in this case the free parameters of the displacement characteristics, is eliminated.
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