Blowhole structural characterization method and device

Abstract

The embodiment of the invention provides a blowhole structural characterization method and a blowhole structural characterization device. The method comprises collecting a rock sample and preparing a rock core; scanning and digitally imaging the rock core, recognizing an image to extract a hole of the rock core; calculating the aspect ratio of each hole of the rock core; setting an aspect ratio threshold for a needle hole, classifying the hole with the calculated aspect ratio less than the threshold into the needle hole and classifying the hole with the calculated aspect ratio not less than the threshold into a non-needle hole; respectively calculating the geometrical characteristic parameters of the needle hole and the non-needle hole; comparing and approximately simplifying the geometrical characteristic parameter of the non-needle hole and the geometrical characteristic parameter of the regular-shape needle hole, so as to form an equivalent hole distribution diagram. With adoption of the method, a simplified, visual and digital equivalent blowhole structure distribution diagram can be established.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical exploration, and in particular relates to a digital characterization method and device for rock pore structure. Background technique [0002] With the deepening of oil and gas exploration and development, complex porous reservoirs such as carbonate rocks and tight sandstones have gradually become the focus and difficulty of exploration and production in my country. Such reservoirs are generally characterized by strong heterogeneity, various rock types, large pore size changes, and variable pore shapes. Conventional oil and gas reservoir geophysical prediction methods are facing unprecedented challenges. [0003] In order to deal with such complex porous media problems, domestic and foreign scholars usually make certain assumptions and simplifications, and develop a series of equivalent medium model equations such as layered model, spherical pore model, inclusion model and contact model (Ma S...

AI Technical Summary

Problems solved by technology

[0005] However, in the current seismic rock physics experiment technology, digital imaging and characterization methods for the pore structure of the above theoretical model are rarely seen.

Existing rock sample scanning experiments and processing methods pay more attention to macroscopic characteristics such as rock type, composition, and porosity, and lack necessary means and scientific and reasonable methods to quantitatively describe the pore level. The digital quantitative characterization of structure and distribution features needs to be further strengthened

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