Multi-component 3D digital core construction method based on multi-source information fusion

Abstract

The invention discloses a multi-component three-dimensional digital rock core construction method based on multi-source information fusion. The method comprises the steps of: performing X-ray CT scanning on a rock core sample to obtain a grayscale image; performing a scanning electron microscope mineral quantitative analysis experiment on the rock core sample, Obtain mineral composition images and mineral composition information; carry out backscattered electron large-area splicing and scanning imaging experiments on core samples to obtain pore development characteristic images; use mineral composition images to perform image registration on pore development characteristic images, according to the registered Identify and classify the pore types developed by the mineral components in the core samples, and quantitatively count the proportion of the pore types corresponding to each mineral component to the total porosity of the core and the pore size distribution information; according to the mineral components of the core samples The component information is compared and analyzed with the gray image to determine the gray value distribution interval on the CT image corresponding to each mineral component; construct a multi-component three-dimensional digital core, and calculate the total porosity.

Description

technical field [0001] The invention relates to the field of well logging technology in petroleum exploration, in particular to a method for modeling multi-component three-dimensional digital cores using multi-source experimental data results in complex lithology reservoirs, specifically a method for multi-source information fusion Multi-component 3D digital core construction method. Background technique [0002] Reservoir rock is a typical porous medium, and its macroscopic physical properties are affected by various microscopic factors. Because petrophysical experiments are difficult to quantitatively measure and control the pore structure and fluid distribution, it is difficult to accurately study the influence of various microscopic factors on macroscopic physical properties of reservoirs only by petrophysical experiments. In addition, due to factors such as low success rate of coring and difficult displacement of complex oil and gas reservoirs, it is difficult to carry...

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Problems solved by technology

[0007] At present, the existing three-dimensional digital core modeling methods at home and abroad are affected by the resolution of X-ray CT scanning, and cannot characterize the distribution of micropore space well; and the established digital core rock skeletons are all single lithological components, which cannot describe Reservoir cores with complex lithology seriously affect the scope of application of 3D digital cores in unconventional reservoirs and the accuracy of numerical simulation of petrophysical properties

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