Novel approach to core sample MCT research for practical petrophysics problems solution

UDK: 550.822.3
Key words: X-ray micro computed tomography, porosity, permeability, virtual cubes
Authors: I.V. Yazynina, E.V. Shelyago, A.A. Abrosimov Gubkin Russian State University of Oil and Gas (National Research University), RF, Moscow), O.N. Veremko (LUKOIL-Engineering LLC, RF, Moscow), E.A. Grachev, N.E. Grachev, D.A. Bikulov, D.S. Senin (Lomonosov Moscow State University, RF, Moscow)

X-ray micro computed tomography (MCT) is a modern method of porous bodies studying. MCT is associated with its ability to visualize structure of the reservoir rock cavities, as well as fluid flow numerical simulation. Many issues of MCT data processing and hydrodynamic modeling are debatable today. In publications available, authors usually focus on pores visualization, but single-phase and especially two-phase flow calculation occurs much less frequently. Researchers often use model objects; face with insufficient MCT resolution problem, limitations of mathematical algorithms and computing resources.

This paper is devoted to the development of a new, affordable approach to MCT research of oil and gas formation core material, aimed at calculating accurate reservoir properties of common Russian reservoir rocks. One of the novel approach ideas is virtual cutting of several porous media segment (virtual cubes) from each of three-dimensional models obtained via MCT. Paired values of porosity and permeability are calculated for each cube. Group of cubes cut from the same model, generates a point cloud. Strong heterogeneity of reservoir properties at the pore level allows covering larger range of values. Finally, it is possible to get not one, but several pairs of porosity and permeability values from each MCT-shooting, which allows saving microtomograph system resource. Such an approach can find practical application in petrophysics when dealing with poorly consolidated rocks, unsuitable for traditional methods of reservoir properties measurement, and little collections of core material. 


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