A Pore Network Approach to Study Throat Size Effect on the Permeability of Reconstructed Porous Media

被引:10
|
作者
Xu, Kai [1 ]
Wei, Wei [2 ]
Chen, Yin [2 ]
Tian, Haitao [2 ]
Xu, Sai [3 ]
Cai, Jianchao [1 ]
机构
[1] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
[2] China Univ Geosci, Inst Geophys & Geomat, Wuhan 430074, Peoples R China
[3] China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
pore network model; permeability; pore size distribution; pore coordination number; pressure distribution; KOZENY-CARMAN CONSTANT; REACTIVE TRANSPORT; SIMULATION; MODEL;
D O I
10.3390/w14010077
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Permeability is usually considered to be related to porosity. However, rocks with the same porosity may have different permeabilities in some cases, because of the variations in pore and throat size and pore space connectivity. It is vitally important to understand the effect of throat size on the transport property. In this work, five sets of regular pore network models and six core-based models are employed to study the effect of throat size on permeability. Four kinds of random distributions, i.e., uniform, normal, Weibull, and log normal, are utilized to generate random pore size. Pore coordination number is set to be two and six for the verification of the effect of connectivity on permeability. Then, single-phase flow simulation is conducted based on the constructed pore network models. The simulation results show that permeability decreases significantly when only one of the nine throats reduces to half size in terms of diameter. The influence of pore coordination number on permeability is not obvious compared to that of small throat size. This study indicates that small throats play an extremely important role in determining permeability.
引用
收藏
页数:14
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