Reservoir classification method based on rock electricity parameters

Abstract

The invention discloses a reservoir classification method based on rock electricity parameters, and belongs to the field of hydrocarbon reservoir evaluation. The method is based on rock electricity experiment theoretical model deduction, a theoretical value range and a value trend of rock electricity experiment data of reservoirs under different pore structures are formed, and reservoir pore structure subareas on a rock electricity data F-phi plate are formed; and corresponding electrical logging data are utilized in combination with rock electricity experiment data and mercury injection capillary pressure curve data to determine rock electricity method quantitative classifications, and the method at least includes: Step 1) establishing a rock electricity method classification bases; Step 2) forming a classification plate; Step 3) establishing a quantitative classification evaluation basis; and Step 4) determining classification grades of the reservoirs. According to the reservoir classification method based on rock electricity parameters in the invention, by checking distribution of the rock electricity data on the F-phi plate and discovering that rock samples of reservoirs of different classes fall on distinguishable different subareas on the F-phi plate, continuous evaluation knowledge can be provided, and a verification effect is good.

Description

technical field [0001] The invention relates to the field of classification of oil and gas reservoirs, in particular to a method for classification of reservoirs based on rock-electric parameters. Background technique [0002] As an important means of petrophysical research, lithoelectric experiment mainly calculates the four key parameters in Archie's formula by measuring the parameters of rock porosity, resistivity and saturation, and then accurately calculates the formation oil and gas saturation. [0003] Complicated lithology (such as glutenite, etc.), low porosity and low permeability, and fractured reservoirs all have more complex pore structures than conventional sandstone reservoirs. This complex pore structure is manifested in the difference in seepage capacity of rocks under the same porosity conditions significantly. That is to say, the reservoir has complex microscopic anisotropy under the background of macroscopic heterogeneity. In the current stratum evaluat...

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Problems solved by technology

[0022] In order to solve the problem of difficult classification and evaluation of sandstone reservoirs with complex pore structures in the prior art, the embodiment of the present invention provides a reservoir classification method based on rock-electric parameters

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