Method and system for analyzing mineral composition of dense sandstone

Abstract

The embodiment of the invention discloses a method and a system for analyzing mineral composition of dense sandstone. The method comprises the following steps: acquiring a mineral sample; pretreating the mineral sample; performing point-by-point energy spectrum analysis on the pretreated mineral sample by using a scanning electron microscope to obtain a scanning electron microscope gray image and a corresponding energy spectrum data volume, comparing the energy spectrum data volume with a standard mineral database, and determining mineral plane distribution characteristics of the gray image; performing micron CT scanning on the pretreated mineral sample, and acquiring a gray slice of a scanning result; comparing gray image with the gray slice, determining the gray image and a matching image in the gray slice, and according to the matching image and the gray image, determining a corresponding relation between a mineral in the gray slice and a gray value; and according to the corresponding relation, establishing a three-dimensional spatial distribution model of the mineral, and determining occurrence and spatial distribution characteristics of the mineral. Through the method and the system for analyzing the mineral composition of the dense sandstone, provided by the invention, accuracy and intuition of mineral composition analysis can be improved.

Description

technical field [0001] This application relates to the technical field of rock mineral analysis, in particular to an analysis method and system for mineral composition of tight sandstone. Background technique [0002] As an important content of petrological research, rock mineral composition has always been concerned 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, wettability, etc. properties and seepage characteristics. With the successful exploration and development of tight sandstone oil and gas at home and abroad, tight sandstone reservoir space characterization and fluid mobility evaluation have become the focus of scholars and production units. Relevant scholars have also noticed in their research that the mineral ...

AI Technical Summary

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

Images