A method for calculating the permeability of sandstone-type uranium ore sand bodies based on flow unit classification

Abstract

The invention belongs to the field of mineral exploration, and aims at solving the problems that the physical heterogeneity of sand bodies in sandstone-type uranium ore stratums in a research area ishigh, and conventional hole-permeability fitting formula accounts for low permeability. The method for calculating the permeability of the sandstone-type uranium ore sand body based on the flow unit classification is provided, and the stratum permeability explanation precision is improved. The method comprises the following steps: 1, calculating a flow unit index of a sample point according to actually measured physical property data of a core of a coring well section; Step 2, realizing reservoir classification by applying a probability graph method; Step 3, establishing a quantitative relation between the flow unit index and the logging response based on five logging curve data of quantitative gamma, natural gamma, density, apparent resistivity and sonic time difference; Step 4, on the basis of flow unit index classification, respectively establishing holes according to different types of reservoirs; a seepage relational expression; Step 5, performing reservoir classification; 6, obtaining a stratum interpretation permeability value; and step 7, drawing a permeability spatial distribution diagram, and establishing an ore searching model.

Description

technical field [0001] The invention belongs to the field of mineral exploration, in particular to a method for calculating the permeability of sandstone-type uranium ore sand bodies based on flow unit classification. Background technique [0002] The study of uranium mineralization characteristics has always been a hot issue in the field of mineral exploration. Predecessors have done a lot of analysis and research on the characteristics of uranium mineralization in the Zhiluo Formation in the northern part of the Ordos Basin, and believe that uranium mineralization should be related to physical parameters (mainly porosity and permeability). [0003] Permeability can be obtained from laboratory core analysis. If no permeability measurements are available, well logs can be used to indirectly evaluate formation permeability. Firstly, the relationship between permeability and porosity should be established. Scholars Kozeny and Carman proposed many different porosity and perm...

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Problems solved by technology

[0005] Aiming at the problem that the physical properties of the sand bodies in the sandstone-type uranium deposit strata in the research area are relatively heterogeneous, and the accuracy of the conventional pore-permeability fitting formula is low in explaining the permeability, the present invention proposes a method based on flow unit classification to calculate sandstone-type uranium ore sand bodies Permeability method aimed at improving the accuracy of sandbody permeability interpretation

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