Quantitative classification evaluation method and device for low-permeability reservoir

Abstract

The invention provides a quantitative classification evaluation method and device for a low-permeability reservoir. The method comprises the following steps: acquiring a capillary pressure curve of a rock core sample; according to the capillary pressure curve of the rock core sample, determining fractal characteristics and fractal dimensions of the micro-pore structure; establishing a cross plot of the fractal dimension of the micro-pore structure and the pore throat characteristic parameters, and determining the correlation between the fractal dimension and the pore throat characteristic parameters; and analyzing the correlation between the fractal dimension and the lithology, physical property parameters and electrical characteristics by using the classification lower limits of different types of reservoirs in a dynamic and static combination manner, and establishing a low-permeability reservoir classification evaluation standard in combination with the correlation between the fractal dimension and pore throat characteristic parameters. According to the method, the complexity of the pore structure of the low-permeability reservoir is quantitatively represented by using fractal dimensions, quantitative classification evaluation of the low-permeability reservoir is realized by combining the correlation between the fractal dimensions and lithology, physical property parameters and electrical characteristics, and a multi-parameter macro-micro combined reservoir classification evaluation standard is established for the low-permeability sandstone reservoir to guide effective development of the low-permeability reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method and device for quantitatively classifying and evaluating low-permeability reservoirs. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] In Liaohe Oilfield, for a certain period of time, the reported reserves of medium and low permeability reservoirs accounted for more than 85% of the annual proven reserves, and the annual oil production accounted for 6.1%-6.7%. important components of production. [0004] Under the background of increasing difficulty in adding proven reserves and deteriorating quality year by year, how to efficiently develop proven low-permeability reserves and increase the annual oil production of low-permeability reservoirs is ...

AI Technical Summary

Problems solved by technology

[0005] At present, the method of classifying and evaluating reservoirs using the J function method is still a qualitative and semi-quantitative evaluation, which has limitations in classification and evaluation, and cannot meet the needs of efficient development

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