Porous carbonate reservoir rock type determination method and device

Abstract

The invention provides a pore type carbonate reservoir rock type determination method and device. The method comprises the following steps: S1, carrying out the naming calibration of mercury injection data corresponding to each basic rock type according to a basic rock type classification result of casting body slice data recognition, so as to obtain a set cluster of a basic rock type mercury injection curve; s2, meshing the mercury injection curves in the set clusters, calculating an overlapping degree coefficient between the mercury injection curve set clusters between any two basic rock types by utilizing an overlapping degree coefficient calculation method according to the overlapping degree of grids where the mercury injection curves are located, and establishing an overlapping degree coefficient matrix; and S3, according to the overlapping degree coefficients obtained in the S2, hierarchical clustering analysis is sequentially carried out on the basic rock types with the maximum overlapping degree coefficients so as to establish a mercury injection curve similarity hierarchical structure between the basic rock types. Meanwhile, after an overlapping degree coefficient threshold value is set, a pore type carbonate reservoir rock type result is output.

Description

technical field [0001] The invention relates to a method and a device for determining the rock type of a porous carbonate rock reservoir, belonging to the technical field of oil and gas field development geology. Background technique [0002] Carbonate reservoirs are affected by the dual effects of sedimentation and diagenesis, and have the characteristics of multiple mineral composition types, complex pore structures, and multiple genetic types of reservoirs. Quantitative characterization of carbonate reservoir quality and reservoir rock The classification of types is an international problem. At present, there are many classification methods for carbonate reservoir rock types. Generally speaking, there are classification methods based on geological characteristics, such as the Falk and Dunham methods, and there are also rock type classification methods based on mathematical models, such as R35, FZI, and FZI*. . Among them, the classification method based on geological ge...

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Problems solved by technology

Among them, the classification method based on geological genetic characteristics emphasizes qualitative geological characteristics such as lithology, diagenesis, and pore development characteristics of carbonate reservoirs, and it is difficult to effectively determine the classification and evaluation criteria of reservoirs for effective reservoir quality evaluation. The rock type classification method based on mathematical models mainly emphasizes the quantitative relationship model between rock physical parameters and rock parameters such as porosity and permeability, but this method ignores the control effect of geological characteristics on reservoir quality differences

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