{"title":"Size Effect on Pore-Scale Variables and Heterogeneous Pore-Network Characteristics in Carbonate Rocks","authors":"Yundong Shou, Zhi Zhao, Xiaoping Zhou, Junwei Chen","doi":"10.1007/s12205-024-2289-4","DOIUrl":null,"url":null,"abstract":"<p>Pore-scale variables, specifically porosity and permeability, are vital in deep resource exploration projects like geothermal energy and shale gas. Digital rock measurement techniques (DRMTs) are commonly employed to match these variables with experimental results. However, limited attention has been given to identifying errors and size effects on pores and pore scale variables, as well as spatial heterogeneous characteristics of pore-networks. In this research, we define pore scale variables and investigate the size effects on these variables through statistical analysis. Additionally, we propose novel empirical formulas for predicting porosity and permeability based on X-ray CT images acquired at varying resolutions from the same carbonate rock sample. Our results indicate that the scanning direction has minimal influence on the physical and hydraulic properties, while these properties are significantly affected by image resolution. The porosity and permeability calculated using the proposed formulas show good agreement with experimental results, with errors below 10%. Consequently, the proposed formulas prove to be effective and reliable in evaluating physical and hydraulic properties based on DRMTs.</p>","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":"25 1","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"KSCE Journal of Civil Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s12205-024-2289-4","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
Pore-scale variables, specifically porosity and permeability, are vital in deep resource exploration projects like geothermal energy and shale gas. Digital rock measurement techniques (DRMTs) are commonly employed to match these variables with experimental results. However, limited attention has been given to identifying errors and size effects on pores and pore scale variables, as well as spatial heterogeneous characteristics of pore-networks. In this research, we define pore scale variables and investigate the size effects on these variables through statistical analysis. Additionally, we propose novel empirical formulas for predicting porosity and permeability based on X-ray CT images acquired at varying resolutions from the same carbonate rock sample. Our results indicate that the scanning direction has minimal influence on the physical and hydraulic properties, while these properties are significantly affected by image resolution. The porosity and permeability calculated using the proposed formulas show good agreement with experimental results, with errors below 10%. Consequently, the proposed formulas prove to be effective and reliable in evaluating physical and hydraulic properties based on DRMTs.
期刊介绍:
The KSCE Journal of Civil Engineering is a technical bimonthly journal of the Korean Society of Civil Engineers. The journal reports original study results (both academic and practical) on past practices and present information in all civil engineering fields.
The journal publishes original papers within the broad field of civil engineering, which includes, but are not limited to, the following: coastal and harbor engineering, construction management, environmental engineering, geotechnical engineering, highway engineering, hydraulic engineering, information technology, nuclear power engineering, railroad engineering, structural engineering, surveying and geo-spatial engineering, transportation engineering, tunnel engineering, and water resources and hydrologic engineering