Method for evaluating compressibility of stratified shale reservoir based on micromechanics experiment

Abstract

The invention discloses a method for evaluating the compressibility of a stratified shale reservoir based on a micromechanics experiment. The method comprises the following steps: collecting a standard shale rock column sample, and processing the shale rock column sample to respectively obtain a shale stratified test pattern and a shale matrix test pattern; carrying out polishing treatment; carrying out a micrometer indentation experiment on the processed shale core, and obtaining the hardness parameters and Young modulus of shale bedding and a shale matrix; enabling the processed shale core to be subjected to a micron scratch experiment, and obtaining fracture toughness parameters of a shale bedding and a shale matrix; observing the drilled stratified shale sample, and obtaining the stratified thickness through statistical geology and fractal theory calculation; carrying out mineral component analysis on the shale debris to obtain shale mineral component characteristics; the method comprises the following steps: constructing a physical model of the bedding shale combination, carrying out scale upgrading and calculation on rock mechanical parameters to obtain parameters of the bedding shale combination, and obtaining comprehensive evaluation indexes of the compressibility of the bedding shale through a combination weight method to carry out compressibility judgment on a region to be fractured.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a method for evaluating the compressibility of bedding shale reservoirs based on micromechanical experiments. Background technique [0002] In recent years, with the continuous improvement of fracturing technology, the proportion of unconventional oil and gas in the world's energy has been increasing; shale oil and gas resources are a very important unconventional resource, and accelerating the efficient development of shale oil and gas resources will promote my country's The development of the oil and gas industry has great strategic significance. Shale oil and gas reservoirs usually have extremely low permeability, so horizontal well multi-stage fracturing technology is required to obtain ideal oil flow for oil and gas industry. At the same time, as a kind of sedimentary rock, shale is easy to form thin-section bedding during the diagenetic process, resulting in ext...

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Problems solved by technology

At the same time, the proposed micromechanical experiment will effectively solve the problems of unstable physical and chemical properties of shale samples in existing mechanical experiments, difficulty in processing standard-sized cores of bedding shale, and long testing period of mechanical experiments. At the same time, it has high accuracy and reliability. Operability, will provide important technical support for volume fracturing design and perforation layer selection of bedding shale reservoirs

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