Effect of Micro Pore-throat on Porosity and Permeability of Dual Media Digital Rock

doi:10.19596/j.cnki.1001-246x.8651

Abstract

Abstract:

In this paper, the representative sandstone matrix and fracture sample are selected for CT scanning to build the corresponding matrix and fracture digital rock respectively. Then, based on the matrix and fracture digital rock with the same physical size and resolution, the Boolean superposition algorithm is introduced to construct matrix-fracture dual media digital rock; meanwhile, an image opening algorithm is used to eliminate pore voxel, and matrix digital rock with different micropore size is reconstructed, also, the superposition algorithm is conducted to reconstruct matrix-fracture dual digital rock with different micropore sizes. Finally, based on the matrix digital rock and matrix-fracture digital rock with different micropore sizs, the total porosity, connected porosity and absolute permeability are calculated. It can be found that, the micro pore-throat has lower contribution to the total porosity of matrix and dual media; the micropore-throat contributes more to the connected porosity of the matrix, but less to the connected porosity of dual media; the micropore-throat makes important contribution to the permeability of matrix, but less to the permeability of dual media. This paper provides an important platform to study the porosity and permeability characteristics of matrix-fracture dual media, which is of great significance to the development of dual-media reservoirs.

Key words: dual media digital rock, superposition method, image opening operation, micro pore-throat, porosity-permeability characteristics

Chenchen WANG, Yongfei YANG, Xin NIE, Denglin HAN. Effect of Micro Pore-throat on Porosity and Permeability of Dual Media Digital Rock[J]. Chinese Journal of Computational Physics, 2023, 40(5): 606-613.

Figures/Tables 10

Fig.1 3D grey image based on Micro-CT scanning (a) matrix sample; (b) fracture sample

Fig.2 Construction of 3D digital rock (a) matrix sample (black-matrix pore/throat, white-skeleton); (b) fracture sample (black-fracture, white-skeleton)

Fig.3 Construction of dual digital rock with superposition method

Fig.4 Construction of matrix digital rock with different pore size before superposition, eliminated voxel (a) S=1; (b) S=2; (c) S=3; (d) S=4; (e) S=5

Fig.5 Construction of dual digital rock with different pore size after superposition, eliminated voxel (a) S=1; (b) S=2; (c) S=3; (d) S=4; (e) S=5

Fig.6 The D3Q19 lattice structure model

Table 1 Comparison of porosity and permeability

	基质样品	裂缝样品	基质-裂缝双重介质样品
孔隙度/%	7.19	4.77	11.73
连通孔隙度/%	4.46	4.77	10.46
渗透率/mD	2.35	187	192.65

Fig.7 Total porosity of matirx sample and matrix-fracture sample with different micro pore size

Fig.8 Connected porosity of matirx sample and matrix-fracture sample with different micro pore size

Fig.9 Permeability of matirx sample and matrix-fracture sample with different micro pore size

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