Method for analyzing reservoir heterogeneity based on multi-scale entropy

Abstract

The invention discloses a method for analyzing reservoir heterogeneity based on multi-scale entropy, and the method comprises the steps: collecting logging signals of a to-be-logged reservoir in different well sections, and obtaining logging curves of the to-be-logged reservoir in different well sections; performing normalization processing and coarse graining processing on the logging curve, and calculating corresponding sample entropy values of reservoir heterogeneity represented by the logging curve under different time scales; drawing a function diagram according to the relationship between the time scale and the corresponding sample entropy value, and constructing a multi-scale entropy curve of the reservoir of different well sections according to the function diagram; and comparing and analyzing the multi-scale entropy curves of different well sections to evaluate the reservoir heterogeneity strength of different well sections. A plurality of pieces of different information is obtained from logging signals according to different scales in a normalization and coarse graining processing mode, the information amount of to-be-processed data is increased in a multi-azimuth and multi-angle mode, meanwhile, a multi-scale entropy curve is constructed, all-directional comparison is achieved, and the accuracy and reliability of information analysis are improved.

Description

technical field [0001] The invention relates to the field of analysis methods for reservoir heterogeneity, in particular to a method for analyzing reservoir heterogeneity based on multi-scale entropy. Background technique [0002] Over the past few decades, countries have devoted themselves to the development of traditional oil and natural gas. However, with the dramatic changes in the global energy landscape, many countries are currently shifting their exploration and development goals to unconventional resources. However, in the actual production process, it will be affected by many factors, especially the impact of heterogeneity in the development of unconventional reservoirs with low porosity and low permeability is more prominent. Heterogeneity studies have given great attention. [0003] However, at present, the analysis of heterogeneity is mainly based on the statistical calculation of the static data of porosity and permeability. Although some scholars have studied...

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Problems solved by technology

[0009] For this reason, the present invention provides a method for analyzing reservoir heterogeneity based on multi-scale entropy to solve the problem that although sample entropy analysis can a

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