Method for improving precision of carbonatite dynamic and static Young modulus conversion model

Abstract

The invention discloses a method for improving the precision of a carbonatite dynamic and static Young modulus conversion model, and particularly relates to the field of carbonatite reservoir logging.The method comprises the following steps: 1, establishing a dynamic and static Young modulus conversion model according to rock physical experiment data; 2, establishing a regression model M1 of an experimental dynamic and static Young modulus difference value S2--a static Young modulus fitting value and an experimental value difference value S1 by utilizing the dynamic and static Young modulus conversion model and rock physical experimental data; 3, establishing a regression model M2 of the experimental dynamic and static Young modulus difference S2 -- porosity according to the rock physicalexperimental data; 4, establishing a correction value model M3; and 5, calculating the fitting static Young modulus of the point to be measured, and correcting by using the regression model M1, the regression model M2 and the correction value model M3 to obtain the corrected static Young modulus. According to the method, the precision of the carbonatite dynamic and static Young modulus conversionmodel is improved, and well logging evaluation and oil field development of the carbonatite reservoir are facilitated.

Description

technical field [0001] The invention relates to the field of well logging of carbonatite reservoirs, in particular to a method for improving the precision of a dynamic and static Young's modulus conversion model of carbonatite. Background technique [0002] In the process of reservoir evaluation and oilfield development, the determination of parameters such as Young's modulus and Poisson's ratio in the target block is very important. If there is a large error in the measured value, it will directly affect the engineering design, construction, reservoir fracturing, etc. successfully launch. [0003] According to different test methods and principles, Young's modulus is divided into dynamic Young's modulus and static Young's modulus; dynamic Young's modulus refers to the Young's modulus calculated by measuring the time difference of longitudinal and transverse waves in rock mass based on elastic theory Quantity, dynamic Young's modulus E d As follows: [0004] [0005] I...

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Problems solved by technology

For rock formations with good physical properties and low anisotropy, a dynamic and static Young's modulus conversion model with high accuracy can be fitted through experiments. For rock formations with strong anisotropy and complex pore structure, the dynamic and static Young's modulus conversion model obtained through indoor experiment fitting is usually not very accurate, and has lost its guiding significance for actual engineering

[0010] Carbonatite reservoirs are characterized by high brittleness, strong anisotropy, and the development of secondary pores and micro-fractures. Therefore, the correlation between dynamic and static Young's moduli of carbonatite reservoirs is poor, and the accuracy of dynamic and static Young's modulus conversion models is low. , and there is still a lack of methods to effectively improve the accuracy of the dynamic and static Young's modulus conversion model for carbonatite reservoirs at this stage

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