Numerical simulation study on the effect of temperature on the restricted diffusion in porous media

作     者：Zhen Xie Lizhi Xiao Sihui Luo Guangzhi Liao Zhen Xie;Lizhi Xiao;Sihui Luo;Guangzhi Liao

作者机构：College of Artificial IntelligenceChina University of PetroleumBejing102249China State Key Laboratory of Petroleum Resources and ProspectingChina University of PetroleumBeijing02249China College of Carbon Neutral EnergyChina University of PetroleumBeijing102249China 

出 版 物：《Magnetic Resonance Letters》 (磁共振快报（英文）)

年 卷 期：2023年第3卷第2期

页      面：118-126,I0003页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by“National Natural Science Foundation of China(Grant No.42204106)” 

主　　题：D-T_(2)spectra Temperature Restricted diffusion Numerical simulation 

摘      要：It is of great significance to study how temperature affects the restricted diffusion in pores for an accurate evaluation of reservoir physical properties by using nuclear magnetic resonance(NMR)diffusion-transverse relaxation(D-T2)spectrum under reservoir temperature *** this paper,we simulate the restricted diffusion and twodimensional(2D)NMR D-T2 spectra of water molecules at different temperatures using random-walk *** one-dimensional(1D)restricted diffusion simulation results show that the diffusion coefficient in the pore at room temperature decays with the diffusion time and eventually reaches a *** the condition of long-time diffusion,the ratio of restricted diffusion coefficient to bulk diffusion coefficient at different temperatures tends to be the same *** the increase in temperature,the simulated D-T2 spectra also gradually move *** simulated D-T2 spectra at all temperatures are consistent with the Pade interpolation *** addition,the results calculated by Pade interpolation equation demonstrate that the degree of temperature influence on the D-T2 spectrum of rock is quantitatively related to the pore radius,porosity and cementation index.