A method and system for analyzing the mineral composition of tight sandstone

Abstract

The embodiments of the present application disclose a method and system for analyzing the mineral composition of tight sandstone, the method includes: acquiring a mineral sample; pre-processing the mineral sample; performing a point-by-point energy spectrum analysis on the pre-processed mineral sample using a scanning electron microscope , obtain the SEM grayscale image and the corresponding energy spectrum data volume, compare the energy spectrum data volume with the standard mineral database to determine the mineral plane distribution characteristics of the grayscale image; perform micro-CT scanning on the preprocessed mineral samples to obtain The grayscale slice of the scan result; compare the grayscale image and the grayscale slice, determine the matching image in the grayscale image and the grayscale slice, and determine the correspondence between the minerals and the grayscale value in the grayscale slice according to the matching image and the grayscale image According to the corresponding relationship, a three-dimensional spatial distribution model of minerals is constructed to determine the occurrence and spatial distribution characteristics of minerals. The method and system for analyzing the mineral composition of tight sandstone provided by the present application can improve the accuracy and intuition of mineral composition analysis.

Description

Technical field [0001] The application relates to the technical field of rock mineral analysis, and in particular to a method and system for analyzing tight sandstone mineral composition. Background technique [0002] As an important part of petrological research, rock mineral composition has always been paid attention to by petrologists and geologists. Because different minerals have differences in particle size, output state, optical properties, mechanical characteristics, and wettability, the relative content and type combination of minerals will affect rock properties, including pore structure, mechanical properties, and wettability. Properties and seepage characteristics. With the successful exploration and development of tight sandstone oil and gas at home and abroad, the characterization of tight sandstone reservoir space and the evaluation of fluid mobility have become the focus of attention of scholars and production units. Relevant scholars have also noticed the impor...

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Problems solved by technology

[0004] In the process of realizing this application, the inventor found that there are at least the following problems in the prior art: the experimental results are directly related to the experience of the experimental researchers: the background baseline needs to be determined when the diffraction peak intensity is calculated, and different personnel determine different baselines, which directly leads to the integral area differences, which in turn lead to differences in experimental results

At the same time, the experimental results are quantitative evaluation results, which lack visual display. After determining the relative content of minerals, it is impossible to determine the occurrence and contact relationship of minerals

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