Method for determining optimal saturation computing model for typical reservoir

Abstract

The invention discloses a method for determining an optimal saturation computing model for a typical reservoir and belongs to the technical field of evaluation on an oil / gas reservoir. The method comprises the following steps of: according to core and well-logging data of an oil / gas reservoir section, selecting a typical whole-diameter core and performing micro-computerized tomography (CT) scanning on the whole-diameter core and an electric petrophysical experiment on the reservoir condition; according to the core and well-logging data, analyzing the characteristics of the reservoir section in which the whole-diameter core exists and the characteristics of pore structures; by using the micro-CT scanning results, determining the type of the reservoir in which the whole-diameter core exists; according to the type of the reservoir in which the whole-diameter core exists, selecting the optimal form of the saturation-computing model; and according to the results of the electric petrophysical experiment, determining the undetermined parameters in the optimal form of the saturation-computing model. The method disclosed by the invention overcomes the key difficulty in determining the saturation-computing model in the prior art, greatly improves the saturation-computing precision for common reservoirs, particularly heterogeneous complicated reservoirs and has obvious effect in the field application to the oil field.

Description

technical field [0001] The present invention relates to the technical field of reservoir evaluation of oil and gas reservoirs, in particular to a method for using full-diameter core analysis, well logging, etc. Methods for determining the best saturation calculation model from the data. Background technique [0002] Archie first proposed the relationship between resistivity and water saturation of oil and gas reservoirs, that is, the Archie formula. This formula lays the foundation for the calculation of reservoir saturation in oil and gas reservoirs and plays an important role in logging evaluation. However, the Archie formula is mainly suitable for isotropically uniform porous reservoirs (such as sandstone reservoirs with good physical properties), and is not suitable for complex reservoirs. Later, someone proposed a series of extended reservoir saturation calculation models for oil and gas reservoirs, such as: cation exchange model (also called W-S model), double water m...

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Problems solved by technology

[0010] In order to solve the difficulty in determining parameters in the existing resistivity-water saturation relationship calculation model, and the calculation model cannot truly reflect the law between reservoir resistivity and water saturation, the present invention provides a method for determining the optimal saturation of typical reservoirs. A method for calculating a model, the method comprising:

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