«Automation and Informatization of the fuel and energy complex»

Inverse tasks of underground hydrodynamics with clarification of the spatial distribution of facies

UDC: 622.276+622.279+519.876.5+532.546
DOI: -

Authors:

¹ Oil and Gas Research Institute, Russian Academy of Sciences, Moscow, Russia

Keywords: geological-hydrodynamic model, inverse task, facies, automated adaptation, geologically consistent adaptation, kriging, porosity field, sandy-silt rocks, gradient method, quality criterion

Annotation:

The approach developed in this article is based on the idea that in real sedimentation conditions there is no clear boundary between two discrete (integer) facies. The formation of a geological body in different facies conditions predetermines the corresponding reservoir properties. So, to calculate properties correlated with a grid cell, averaging of properties between all facies that influenced a given cell will be required. A continuous facies parameter can be interpreted as a weighted fraction of a particular facies in the given cell, which would be a transitional reservoir type between pure integer facies types. The article discusses an algorithm for refining the spatial distribution of facies in the task of automated adaptation of a 3D hydrodynamic reservoir model (the inverse task). The resulting fields of reservoir properties take into account the fractional contribution of the constituent facies when calculating these properties. Thus, the proposed approach allows more realistically taking into account the features of sedimentation environments.

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