Carbonate reservoir rock classification method

Abstract

The invention provides a carbonate reservoir rock classification method. The method comprises the following steps: extracting a pore throat radius parameter reflecting reservoir quality from a mercury injection capillary pressure curve of each to-be-classified reservoir rock; based on an image processing technology, extracting pore characteristic parameters reflecting pore types from each casting body slice of the each to-be-classified reservoir rock; performing principal component analysis on the pore characteristic parameters, and extracting a first principal component parameter; and performing clustering analysis on all the pore throat radius parameters and all the first principal component parameters to obtain a plurality of categories of reservoir rocks. The parameters extracted from various rock core scales, such as the pore throat radius parameter and the pore feature parameter, are integrated to classify the rock, the relationship among geology, rock physics and microscopic slice data is balanced, the rock reservoir classification process gives consideration to macroscopic and microscopic scales, reservoir geological cause connotation can be revealed to achieve a prediction effect. And the reservoir reservoir and oil and gas production capability can be determined to guide oil and gas reservoir development.

Description

technical field [0001] The invention relates to the field of geological exploration, more specifically, to a method for classifying carbonate rocks. Background technique [0002] The rock classification of carbonate rock reservoirs is the process of dividing the reservoirs into several relatively homogeneous categories under the background of strong heterogeneity in the reservoir description stage. The purpose of spatial distribution prediction is to serve the development of oil and gas reservoirs. The process of classifying reservoir rocks is not a simple lithology classification. The ideal result of reservoir rock classification is "experienced similar depositional process and diagenetic process, have similar pore structure, under the condition of consistent wettability, have uniform porosity-permeability relationship, similar capillary pressure curve distribution and relative permeability A collection of rocks with a rate of one class, in practical applications, the stan...

AI Technical Summary

Problems solved by technology

The classification of rock types according to the throat radius is only applicable to samples with similar capillary pressure curves, and has certain practical significance for clastic rocks and relatively homogeneous carbonate rocks. For carbonate rocks with strong homogeneity, the capillary pressure curves are complex and varied, and these methods are often not applicable

The limitation of the Thomeer function classification method is that it cannot reflect geological characteristics, and the mercury injection capillary pressure curve must have a large pressure range to obtain evaluation parameters

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