微孔喉对基质-裂缝介质储渗特征的影响规律研究

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

计算物理 ›› 2023, Vol. 40 ›› Issue (5): 606-613.DOI: 10.19596/j.cnki.1001-246x.8651

微孔喉对基质-裂缝介质储渗特征的影响规律研究

王晨晨¹^,²(), 杨永飞³^,*(), 聂昕²^,⁴, 韩登林²^,⁵

1. 长江大学非常规油气省部共建协同创新中心, 湖北武汉 430100
2. 长江大学储层微观结构演化及数字表征实验室, 湖北武汉 430100
3. 中国石油大学(华东)石油工程学院, 山东青岛 266580
4. 长江大学地球物理与石油资源学院, 湖北武汉 430100
5. 长江大学地球科学学院, 湖北武汉 430100

收稿日期:2022-10-17 出版日期:2023-09-25 发布日期:2023-11-02
通讯作者: 杨永飞
作者简介:
王晨晨，男，博士研究生，讲师，硕士生导师，研究方向为数字岩心分析和微观渗流模拟，E-mail：wcc1220@163.com
基金资助:
国家自然科学基金项目(51704033); 中国石油科技创新基金项目(2018D-5007-0210)

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

Chenchen WANG¹^,²(), Yongfei YANG³^,*(), Xin NIE²^,⁴, Denglin HAN²^,⁵

1. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China
2. Laboratory of Reservoir Microstructure Evolution and Digital Characterization, Yangtze University, Wuhan, Hubei 430100, China
3. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
4. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China
5. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China

Received:2022-10-17 Online:2023-09-25 Published:2023-11-02
Contact: Yongfei YANG

摘要/Abstract

摘要：

选取代表性的砂岩基质样品和裂缝样品, 通过微米CT扫描方法分别建立相应的基质和裂缝三维数字岩心。然后, 基于相同物理尺寸和分辨率的基质样品数字岩心和裂缝数字岩心, 通过布尔叠加算法构建基质-裂缝双重介质数字岩心; 同时, 基于图像开运算算法进行孔隙体素消除, 获取不同微孔喉尺寸的基质数字岩心, 并叠加构建不同微孔喉尺寸的基质-裂缝双重数字岩心。最后, 基于不同微孔喉尺寸下基质样品和基质-裂缝双重介质样品三维数字岩心, 分别计算相应的总孔隙度、连通孔隙度和绝对渗透率, 可以发现: 微孔喉对基质和基质-裂缝样品的总孔隙度整体贡献较小; 微孔喉对基质的连通孔隙度有较大贡献, 但对双重介质的连通孔隙度贡献较小; 微孔喉对基质的渗透率有重要贡献, 对基质-裂缝双重介质的渗透率贡献较小。

关键词: 双重介质数字岩心, 叠加法, 图像开运算, 微孔喉, 储渗特征

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

王晨晨, 杨永飞, 聂昕, 韩登林. 微孔喉对基质-裂缝介质储渗特征的影响规律研究[J]. 计算物理, 2023, 40(5): 606-613.

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.

图/表 10

图1 基于微米CT扫描获取的三维灰度图像 (a) 基质样品; (b) 裂缝样品

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

图2 三维数字岩心的构建 (a) 基质样品(黑色-基质孔喉，白色-颗粒); (b) 裂缝样品(黑色-裂缝，白色-颗粒)

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

图3 基于叠加法构建的双重介质数字岩心

Fig.3 Construction of dual digital rock with superposition method

图4 叠加前不同微孔喉尺寸的基质样品三维数字岩心, 消除体素 (a) S=1; (b) S=2; (c) S=3; (d) S=4; (e) S=5

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

图5 叠加后不同微孔喉尺寸的基质-裂缝双重数字岩心，消除体素 (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

图6 D3Q19模型网格结构图

Fig.6 The D3Q19 lattice structure model

表1 各样品孔渗参数表

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

图7 不同微孔喉尺寸下基质样品和基质-裂缝样品的总孔隙度

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

图8 不同微孔喉尺寸下的基质样品和基质-裂缝样品的连通孔隙度

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

图9 不同微孔喉尺寸下基质样品和基质-裂缝样品的渗透率

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

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微孔喉对基质-裂缝介质储渗特征的影响规律研究

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

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