Micro-CT technology-based reservoir core three-dimensional entity model reconstruction method

Abstract

The invention relates to a micro-CT technology-based reservoir core three-dimensional entity model reconstruction method. The method includes the following steps that: a micro-CT technology is utilized to scan a reservoir core, so that a sectional scanning image of the reservoir core can be obtained, so that a CT image of a real reservoir core can be obtained, and a watershed algorithm is adopted to perform image segmentation on the CT image, so that the three-dimensional data of the image can be obtained; a Marching Cubes algorithm is adopted to generate a three-dimensional surface model of the reservoir core; and with the three-dimensional surface model of the reservoir core adopted as constraints, a constrained Delaunay tetrahedralization algorithm is utilized to generate the three-dimensional entity model of the reservoir core. According to the method of the invention, the three-dimensional entity model of the real reservoir core is established based on the sectional scanning image of the reservoir core, so that the obtained three-dimensional entity model of the reservoir core is more approximate to the structure of a real reservoir core. The method of the invention has the advantages of high accuracy and high efficiency. With the method adopted, defects of poor accuracy and low efficiency in the reconstruction of the three-dimensional entity model of a reservoir core in the prior art can be eliminated, and an effective guarantee can be provided for reservoir core simulation characteristic research.

Description

technical field [0001] The invention relates to a reconstruction technology of a three-dimensional solid model of a reservoir core, in particular to a method for establishing a three-dimensional solid model based on the real structure of the reservoir core. Background technique [0002] At present, there are mainly two types of modeling methods for reservoir cores: one is based on physical experiment methods, which use high-precision tomographic scanning equipment such as X-ray CT scanners to scan reservoir cores to obtain different cross-sections of reservoir cores. The 2D image of the reservoir core is then established using a suitable 3D reconstruction algorithm. One is based on the numerical reconstruction method. In this aspect, a small number of two-dimensional pictures are used to obtain the statistics of reservoir core pores and entities through mathematical statistics. On this basis, relevant mathematical methods are used to obtain a three-dimensional solid model of...

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Problems solved by technology

At present, the method of reconstructing the 3D solid model of reservoir core is usually based on the statistical method of stochastic simulation. The relevant topological information of reservoir core required by this method, such as the size distribution of pores and throats, is mainly given artificially, which is different from that of the actual reservoir. The real structure of the core is quite different, and the reconstruction efficiency of the model is low, which is not conducive to the subsequent numerical simulation research

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