Abstract
Image inpainting and the extraction of different components from the electrical image log images are performed. After generating the training image, determining the appropriate template, multigrid, and event, calculating the conditional probability distribution function and defining the search tree, a three-dimensional digital core is reconstructed. A method for reconstructing three-dimensional digital cores based on multiple-point geostatistics in a cylindrical coordinate system is proposed in this paper. The electrical image log image is generated in a cylindrical coordinate system. The training image and conditional probability distribution function based on the cylindrical coordinate system are different from those based on a rectangular coordinate system. A three-dimensional digital core is evaluated based on an analysis of the local porosity and pore size. The experimental results show that three-dimensional digital core reconstruction based on multiple-point geostatistics in a cylindrical coordinate system is similar to the real core by statistical characteristics and connectivities. A three-dimensional digital core with high reliability can be used as a basis for numerical simulations in rock physics research.
Highlights
Digital core technologies, which have been developed in recent years, are effective methods for core analysis
The effectiveness and accuracy of the three-dimensional digital core based on the electrical image log image are evaluated
The local porosity distribution function reflects the homogeneity in the three-dimensional digital core based on the electrical image log images
Summary
Digital core technologies, which have been developed in recent years, are effective methods for core analysis. The main method for creating a three-dimensional digital core based on two-dimensional CT images utilizes a simulated annealing algorithm [8]. This algorithm randomly generates skeletons with porosities of φ in some reservoirs. There are few reports on using multiple-point geostatistics to reconstruct three-dimensional digital cores from carbonate reservoirs. Multiple-point geostatistics are used to reconstruct a three-dimensional digital core using two-dimensional electrical image log images. The main contribution of the paper is summarized below: A method for reconstructing three-dimensional digital cores based on multiple-point geostatistics in a cylindrical coordin-ate system is proposed in this paper
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