Multi-mineral-phase digital core construction and pore category distinguishing method based on two-dimensional image

Abstract

The invention discloses a multi-mineral-phase digital core construction and pore category distinguishing method based on a two-dimensional image. The method comprises steps that a first data body representing a first mineral digital core and a second data body representing a second mineral digital core are obtained according to a plurality of two-dimensional rock electron scanning electron microscope images, wherein in the first data volume, the numerical value 0 represents a first mineral phase pore and the numerical value 1 represents a non-first mineral phase pore part, and in the second data volume, the numerical value 0 represents a second mineral phase pore and the numerical value 1 represents a non-second mineral phase pore part; a numerical value 1 in the second data body is modified into n to obtain a third data body; the first data body and the third data body are added to obtain a fourth data body, the numerical values 0 and 1 in the fourth data body represent the second mineral phase porosity, the numerical value n represents the first mineral phase porosity, and the numerical value n+1 represents the rock solid; and according to the fourth data body, extraction is carried out to obtain a wall surface file of the first mineral phase pore and a wall surface file of the second mineral phase pore.

Description

technical field [0001] The invention relates to the technical field of oil and gas seepage, in particular to a two-dimensional image-based multi-mineral facies digital core construction and pore classification method. Background technique [0002] The digital core is a digital matrix that accurately identifies the solids and pores of the real core at a certain resolution, and is the basis for the study of pore-level microscopic seepage theory. On the microscopic pore scale, digital cores provide an important research avenue for studying fluid flow in porous media. [0003] In related technologies, a single boundary condition is used for all pores in the flow simulation process of the multiphase digital core. However, rocks are composed of a variety of mineral components, and different mineral pore walls have different wettability and action mechanisms. When a single boundary condition is used for flow simulation in the core, there is a large deviation between the simulation...

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Problems solved by technology

However, rocks are composed of a variety of mineral components, and the pore walls of different minerals have different wettability and mechanism of action. When a single boundary condition is used for the flow simulation in the core, there is a large deviation between the simulation results and the actual situation

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