Multi-component three-dimensional digital core building method based on multi-source information fusion

Abstract

The invention discloses a multi-component three-dimensional digital core building method based on multi-source information fusion. The method comprises the steps that X-ray CT scanning is carried out on a core sample to obtain a gray level image; a scanning electron microscope mineral quantitative analysis experiment is carried out on the core sample to obtain mineral component images and mineral component information; a backscattered electron large-area splicing, scanning and imaging experiment is carried out on the core sample to obtain hole development feature images; the mineral component images are used for registration of the hole development feature images, hole types developed through mineral components in the core sample are recognized and divided according to the registered hole development feature images, and the contribution proportion of the hole type corresponding to each mineral component for the total core porosity and hole distribution information are calculated quantitatively; the mineral component information of the core sample is compared with the gray level image for analysis, and a gray level value distribution interval, corresponding to each mineral component, on a CT image is determined; a multi-component three-dimensional digital core is built, and the total porosity is calculated.

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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