地下非均匀介质渗透率-电导率关系的尺度效应及定量表征

批准号:
42004086
项目类别:
青年科学基金项目
资助金额:
24.0 万元
负责人:
韦伟
依托单位:
学科分类:
矿产地球物理学
结题年份:
2023
批准年份:
2020
项目状态:
已结题
项目参与者:
韦伟
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中文摘要
传统地下非均匀介质渗透率测试存在测量流程繁杂、成本较高、区域范围测量困难等缺陷,利用电导率测试具有易测量、花费低和非破坏性探测等优势,通过电性特征精确评价地下非均匀介质渗透率是地球物理勘探等领域的研究热点之一,但渗透率-电导率关系在尺度效应影响下的变化规律并不明确。研究表明岩石渗透率和电导率都与孔隙结构参数密切相关。本项目拟从多尺度岩石物性测量出发,设计米级尺度岩石物性沙箱测试装置,利用CT技术扫描沙箱岩心,重构数字岩心描述岩心尺度及孔隙尺度微观结构特征;通过渗透率-电导率联合测量实验与数值模拟方法,结合分形理论、逾渗理论及有效介质理论,分析结构参数与尺度参数对渗透率-电导率关系影响权重,建立不同尺度下渗透率-电导率无量纲关系。研究成果预期将揭示尺度效应对岩石物性的影响机制,获取具有普适性的渗透率-电导率表征模型,为地下非均匀介质物性预测方法提供新的理论依据。
英文摘要
Electrical conductivity measurement has the advantages of easy operation, low cost, and non-destructive measurement. It compensates for the traditional permeability measurement, which is with the complex of measurement process, high expenses, and difficulties in large-scale measurements. Accurate evaluation of rock permeability through electrical characteristics is one of the hot topics in geophysical exploration. However, the relationship between permeability and electrical conductivity of rock under the influence of scale effect is not clear. The previous research indicated that the change in rock permeability and conductivity is closely related to pore structure parameters. The project designs a sandbox test device of the metre scale for multi-scale rock physical property measurement. Using the CT device to scan the rock core of the sandbox, the digital core is reconstructed to describe microstructure characteristics in the core scale and the pore scale. Based on the combination measurement of permeability and electrical conductivity, the fractal theory, the percolation theory and the effective medium theory are used to evaluate the weight ratio of the structural parameters and scale parameters, and establish the dimensionless relationship between permeability and electrical conductivity at different scales. The research results are going to reveal the mechanism of scale effect on rock physical properties, and obtain a universal permeability-electrical conductivity model. The work will provide a new theoretical foundation for the evaluation of the physical properties for underground heterogeneous media.
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DOI:10.1021/acs.energyfuels.0c04027
发表时间:2021-02-16
期刊:ENERGY & FUELS
影响因子:5.3
作者:Tian, Zhenhua;Wei, Wei;Cai, Jianchao
通讯作者:Cai, Jianchao
DOI:10.1016/j.marpetgeo.2022.105694
发表时间:2022-04-22
期刊:MARINE AND PETROLEUM GEOLOGY
影响因子:4.2
作者:Li, Xiaobin;Wei, Wei;Cai, Jianchao
通讯作者:Cai, Jianchao
DOI:--
发表时间:2022
期刊:SPE Journal
影响因子:--
作者:Lan Mei;Wei Wei;Jianchao Cai;Qingbang Meng
通讯作者:Qingbang Meng
DOI:10.1007/s40789-023-00627-z
发表时间:2023-10
期刊:International Journal of Coal Science & Technology
影响因子:8.3
作者:Xiaobin Li;Wei Wei-Wei;Yuxuan Xia;Lei Wang;Jianchao Cai
通讯作者:Xiaobin Li;Wei Wei-Wei;Yuxuan Xia;Lei Wang;Jianchao Cai
DOI:10.1007/s11053-022-10056-5
发表时间:2022-04
期刊:Natural Resources Research
影响因子:5.4
作者:Sai Xu;Zhengming Yang;Songtao Wu;Lei Wang;Wei Wei-Wei;Fenghai Yang;Jianchao Cai
通讯作者:Sai Xu;Zhengming Yang;Songtao Wu;Lei Wang;Wei Wei-Wei;Fenghai Yang;Jianchao Cai
国内基金
海外基金
