A method, device and system for constructing a digital rock core

Abstract

The embodiment of this specification discloses a method, device and system for constructing a digital rock core. The method comprises performing a CT scan on the core sample, and determining the microporous region in the core sample based on the CT scanning result; calculating the porosity of the micropore in the microporous region; and calculating the CT scanning result based on the porosity Perform equivalent treatment on the pore area and micropore area to establish a pore network model; calculate the permeability of the pore network model, and judge whether the permeability meets the preset error criterion; confirm that the permeability meets the preset error criterion When , it is determined that the pore network model is the constructed digital core. By using the embodiments of the present specification, the constructed digital core can more truly reflect the pore-throat structure of the actual core, thereby improving the accuracy of digital core construction.

Description

Technical field [0001] The present specification embodiments belong to the field of rock physics, and more particularly to a method, apparatus, and system for constructing digital core. Background technique [0002] Carbonate is an important oil and gas reservoir, which can take 47% of the world's oil storage reserves, and the total oil and gas production accounts for 60% of the total output of the world. At present, the large carbonate reservoir found in my country is the Tahe Oilfield and Renqiu Oilfield, the oil and gas production and reserves of the two oil fields are high than many of the domestic sandstone reservoirs, with great mining value. The carbonate layer has a more type of reservoir, mainly with different types of multi-scale cracks, holes and pores, and there are different degrees of discrete to the genetic mechanism of the storage collective. There is a long time in the production of carbonate stratum stratigraphic, and there is a wide range, and the type has beco...

AI Technical Summary

Problems solved by technology

[0004] At present, the method of establishing a 3D digital core based on Micro-CT is limited by the scanning resolution, and cannot identify nano-scale and some micro-scale pores, especially in carbonate rocks, there are many micro-pores that cannot be identified by conventional Micro-CT. If the digital core is reconstructed only according to the pores identified by the scanned image, not only the identified porosity has a large error with the actual one, but also the established digital core cannot represent the actual core. For example, the publication numbers are CN108267466A and CN109472112A patents

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