Conditioned Simulations of Random Velocity Fields |
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Authors: | D Geraets C Lajaunie P Ruffo |
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Institution: | (1) 41 chaussée de Namur, 1367 Petit-Rosière, Belgium;(2) Centre de Géostatistique, Ecole des Mines de Paris, Fontainebleau, France;(3) ENI–Agip Division, San Donato Milanese, Italy |
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Abstract: | In petroleum exploration and production, it is essential to have good estimations of the uncertainties on the reserves. Uncertainties
on the velocity model used during the data processing are of major importance in this estimation. The generation of several
velocity fields gives access to a quantified estimation of the uncertainties due to the velocity model inversion. The use
of statistical methods helps in generating several important, equiprobable velocity fields, matching all the available velocity
information. This paper presents an efficient simulation algorithm to generate instantaneous velocity fields, constrained
by the distribution of values measured at the wells, and calibrated by the stacking velocities, taken as root-mean-square
velocities. The simulations also match the covariance model given for the instantaneous velocity fields. The method is developed
in a simple one-layer case with constant velocity, and then extended to more realistic situations. Finally, a real data application
is shown, using data provided by ENI–Agip Division, and the efficiency of the proposed simulation method is discussed. |
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Keywords: | Simulation Stacking velocity Uncertainties |
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