Fracture network 3D digital core modeling method

Abstract

The invention provides a fracture network 3D digital core modeling method comprising the steps as follows: step 1, using a CT scanning method or numerical method to establish a rock matrix 3D digital core; step 2, using a random method to generate a fractal discrete fracture network FDFN based on the assumption that fracture distribution satisfies the fractal characteristics; and step 3, discretizing the FDFN and superposing the FDFN and the rock matrix digital core voxel by voxel to obtain a fracture network 3D digital core. By adopting the fracture network 3D digital core modeling method of the invention, the problem that a representative core can be hardly obtained for a fractured reservoir is solved, and a research platform is provided for numerical simulation research of the physical properties of rocks in the fractured reservoir. Therefore, the method is worth promotion.

Description

technical field [0001] The invention relates to the field of rock physics research, in particular to a three-dimensional digital rock core modeling method of a fracture network. Background technique [0002] There are two main types of modeling methods for digital cores: one is physical methods, which use experimental instruments to directly image core samples to construct digital cores, mainly including sequential two-dimensional thin section superposition imaging methods, confocal laser scanning methods, and non-destructive X-ray CT methods. The scanning imaging method; the other is the mathematical method, which is based on high-precision two-dimensional thin-section images, and reconstructs three-dimensional digital cores through stochastic simulation or geological process simulation. [0003] Since the repeated cutting, planing and imaging of the sample surface by the sequential two-dimensional thin-section imaging method takes a lot of time, and the digital core constr...

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Problems solved by technology

The digital core established by the process simulation method has good pore connectivity, but it is generally only suitable for the reconstruction of digital cores of simple rocks in the diagenetic process

[0007] From the perspective of numerous digital core modeling methods at present, the research mainly focuses on the modeling method of digital core for porous reservoirs, while the research on digital core modeling methods for fractured reservoirs is less

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