Method for constructing multi-scale digital rock core based on fusion of CT scanned image and electro-imaging image

Abstract

The invention discloses a method for constructing a multi-scale digital rock core based on fusion of a CT scanned image and an electro-imaging image. The method is characterized by extracting a large-scale pore and rock skeleton from the electro-imaging image, calculating partial porosity distribution and pore dimension distribution thereof, and constructing a large-scale three-dimensional digital rock core in radial direction; meanwhile, extracting a small-scale pore and rock skeleton from the CT scanned image, calculating partial porosity distribution and pore dimension distribution thereof, and constructing a small-scale three-dimensional digital rock core in depth longitudinal direction; and selecting horizontal sections, the depth of which are same, of the large-scale three-dimensional digital rock core and the small-scale three-dimensional digital rock core respectively, fusing the horizontal sections to generate a multi-scale two-dimension slice having small-scale pores and large-scale cracks and holes, and constructing a three-dimensional digital rock core through the multi-scale two-dimension slice, thereby solving the problem of constructing a multi-scale three-dimensional digital rock core of unconventional reservoir of shale, tight sandstone and carbonate rock and the like, and enabling the digital rock core module to be same with the actual rock to the largest degree.

Description

technical field [0001] The invention relates to the field of logging technology data processing, in particular to a method for constructing multi-scale digital rock cores based on the fusion of CT scanning images and electrical imaging images. Background technique [0002] Based on the digital core technology, the petrophysical characteristic parameters at different scales of the reservoir are obtained through numerical simulation, so as to establish an accurate and effective logging interpretation model; [0003] The current 3D digital core numerical simulation method has been widely used in homogeneous sandstone reservoirs, but for complex reservoirs such as carbonate rocks, due to the wide range of pore size distribution and strong heterogeneity. The 3D digital core modeling method suitable for homogeneous sandstone cannot be directly extended to complex reservoirs such as carbonate rocks. [0004] There is a dialectical relationship between the core scanning resolution ...

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Problems solved by technology

At present, there is no relevant literature report on the fusion of CT scanning images and electrical imaging images to construct multi-scale 3D digital cores of carbonate rock reservoirs

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