Article
Multidisciplinary Sciences
Luis Felipe Orellana, Christophe Nussbaum, Luiz Grafulha, Pierre Henry, Marie Violay
Summary: This paper characterizes the physical and mineralogical properties of the internal fault core structure intersecting the main host rock investigated for nuclear waste storage at the Mont Terri Laboratory in Switzerland. The study found that the fault gouge has a higher permeability compared to the surrounding rock, but the barrier property of the geological formation is almost unaffected due to its limited thickness.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Thomas Buchner, Thomas Kiefer, Luis Zelaya-Lainez, Wolfgang Gaggl, Thomas Konegger, Josef Fuessl
Summary: The development and improvement of brick materials still relies on empirical knowledge and extensive testing series. Detailed knowledge of the microstructure of clay bricks is essential for physically based optimization of their thermal and mechanical properties. The combination of micro-computed tomography and scanning electron microscopy allows for precise pore size distributions and insights into the 3D pore structure of brick materials, leading to a better understanding and potential optimization of these commonly used materials.
APPLIED CLAY SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Shengfu Wang, Liang Lv, Kaixi Xue, Dongjie Zhang, Mingdong Li, Dongwei Li, Chang Yuan
Summary: This study investigated the pore structures of mucky clay and silty clay before and after freeze-thaw and compression using Mercury Intrusion Porosimetry (MIP). It was found that freeze-thaw and compression led to changes in pore volume and pore surface area, which were quantitatively estimated using capacity dimension.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Construction & Building Technology
Shujun Li, Gaofeng Chen, Zhenhai Xu, Xu Luo, Jianming Gao
Summary: This study investigates the particle size effect of recycled clay brick powder (RCBP) on the pore structure of blended cement pastes. The results show that reducing the particle size of RCBP effectively improves the pore structure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Agricultural Engineering
Jing Qian, Jingjing Gao, Zhengbin He, Songlin Yi
Summary: The study evaluated the density and pore structure characteristics of self-shrinking Ailanthus altissima substrate obtained by ultrasonic-assisted treatment, revealing changes in the wood density and pore structure after treatment. Samples treated with 1% and 4% NaOH showed higher density but lower porosity compared to water-immersion samples, with an increase in the relative content of macropores.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Engineering, Environmental
Xianwei Zhang, Gang Wang, Xinyu Liu, Yiqing Xu, Lingwei Kong
Summary: This study investigates the pore characteristics of natural marine clay and its relationship with macroscopic performance using various techniques. The results show that the clay has a randomly oriented open-flocculated structure and contains ink-bottle pores. This study enhances the understanding of the pore characteristics of natural structured clays.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Soil Science
Jocenei A. T. de Oliveira, Fabio A. M. Cassaro, Luiz F. Pires
Summary: This study used X-ray micro-tomography images and a computational algorithm based on mercury intrusion porosimetry to evaluate the impact of different agricultural management systems (CT, MT, NT) on soil structure. The results showed significant changes in pore size distribution under CT and MT, with CT and NT being the main drivers of changes in soil porosity. The computational algorithm proved valuable for quantifying pore size distribution and modifications induced by different management systems.
SOIL & TILLAGE RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Yury Villagran-Zaccardi, Natalia Alderete, Philip van den Heede, Nele De Belie
Summary: Eco-friendly concrete mixtures efficiently use constituents for durable structures; ternary mixes have a good balance of environmental impact, cost, and performance; pore structure analysis is valuable for predicting durability, with no significant effects of GGBFS and limestone powder observed.
APPLIED SCIENCES-BASEL
(2021)
Article
Forestry
Dessie T. Tibebu, Stavros Avramidis
Summary: Understanding the fractal dimension of wood pores is essential for studying its macroscopic properties. This research used the pore size distribution to explore the fractal dimension of softwoods and hardwoods. The results revealed significant differences in pore size distribution and fractal dimension values for different pore sizes.
Article
Chemistry, Physical
Nidhi Murali, Pratik Gujar, Pijush Ghosh
Summary: This study investigates the mechanism of interfacial adhesive strength between epoxy coating and soil. The results show that plastic deformation of epoxy and physical adhesion at the interface are the main contributors to the interfacial strength.
APPLIED CLAY SCIENCE
(2022)
Article
Materials Science, Ceramics
Claudia Voigt, Alina Schramm, Jana Hubalkova, Nora Brachhold, Herbert Giesche, Christos G. Aneziris
Summary: Carbon-bonded alumina samples with different compositions and mixing and shaping procedures were tested for their densities, porosities, and pore entryway diameter distributions. Most samples showed no release of mercury during pressure reduction, but a constant cumulative volume. Samples without carbon binder and uninitiated carbon binder showed an extrusion of mercury causing a hysteresis curve.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Construction & Building Technology
Wenhu Fan, Ping Yang, Shengfu Wang, Xi Zuo, Yingying Chen
Summary: The study examined the effects of freeze-thaw (F-T) on the pore structure of soil using X-ray computed tomography (CT) and mercury intrusion porosimetry (MIP). The results showed that F-T significantly altered the pore properties of the soil, particularly the shape and orientation of macropores and micropores. The study also found that the effects of F-T were more pronounced in the open system compared to the closed system.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Energy & Fuels
Fengjuan Lan, Yong Qin, Ming Li, Yugan Wang, Yuhang Liu
Summary: The role of the material that generates hydrocarbons in coalbed seams and the pore structure in wet gas and dry gas areas are examined. The different pore structures affect the distribution of wet gases, with wet gas areas having a greater total specific surface area and pore volume in micropores.
Article
Engineering, Chemical
Neil Taylor, Wanli Justin Ma, Adam Kristopeit, Sheng-ching Wang, Andrew L. Zydney
Summary: Sterile filtration is commonly used in processing recombinant proteins to remove microorganisms, but applying this technology to larger biotherapeutics like Live-Attenuated Vaccines (LAV) poses challenges. This study evaluated the fouling behavior of eight different sterile filters using fluorescently-labeled latex spheres as model particles, finding a correlation between particle diameter, pore size, and transmission rates. The results provide insights into the selection of appropriate sterile filters for processing vaccines and viruses larger than 100 nm.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Construction & Building Technology
Jing Cao, Fangyi Liu, Siyang Huang, Cheng Kong, Huafeng Sun, Yue Gao, Fuhua Liu, Jianyun Li, Guoshou Liu
Summary: This study investigates the impact of soil containing humic acid (HA) on the strength of cement-soil through unconfined compressive strength (UCS) tests and microscopic experiments. The results indicate that the addition of HA decreases the strength of cement-soil and alters the failure mode to plastic failure.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Liene Spruzeniece, Michael Spaeth, Janos L. Urai, Estibalitz Ukar, Michael Selzer, Britta Nestler, Alexander Schwedt
Summary: The study on Liassic limestones in Somerset, UK, revealed a special microstructure of calcite microveins with wide-blocky crystals, formed in open, fluid-filled fractures. The results suggest that growth competition and different types of seed grain play a crucial role in the formation of wide-blocky crystals in the veins.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geosciences, Multidisciplinary
Martijn Passchier, Cees W. Passchier, Christopher Weismuller, Janos L. Urai
Summary: Manual mapping of a full-resolution UAV-based dataset and DEM of the wave-cut Lilstock Benches resulted in the identification of up to eight successive sets of joints, revealing unique characteristics in terms of shape, orientation, spatial distribution and cross-cutting relations in the whole outcrop. The presence of low-angle crossings and junctions of joints suggest periods of partial joint sealing and reactivation.
JOURNAL OF STRUCTURAL GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Dan M. Tamas, Alexandra Tamas, Jessica Barabasch, Mark G. Rowan, Zsolt Schleder, Csaba Krezsek, Janos L. Urai
Summary: This study focuses on an intrasalt, sub-horizontal shear zone in the Romanian Eastern Carpathians, shedding light on the formation and evolution of salt structures and providing a detailed description of the unique geological features of salt-cored anticlines.
Article
Geochemistry & Geophysics
Michael Spaeth, Liene Spruzeniece, Janos L. Urai, Michael Selzer, Max Arndt, Britta Nestler
Summary: Building on recent advancements in phase-field modeling, this study analyzes the microstructure of calcite veins in limestone, focusing on factors such as fracture aperture and crystal growth competition. Results show the ability to reproduce a wide range of vein microstructures in limestone, identifying different archetypes and their kinematic and transport processes. This research provides insights into crystal morphology in open fractures and presents a framework for interpreting the evolution of calcite veins in limestones.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Peter B. Kelemen, Juan Carlos de Obeso, James A. Leong, Marguerite Godard, Keishi Okazaki, Alissa J. Kotowski, Craig E. Manning, Eric T. Ellison, Manuel D. Menzel, Janos L. Urai, Greg Hirth, Matthew Rioux, Daniel F. Stockli, Romain Lafay, Andreas M. Beinlich, Jude A. Coggon, Nehal H. Warsi, Jurg M. Matter, Damon A. H. Teagle, Michelle Harris, Katsuyoshi Michibayashi, Eiichi Takazawa, Zaher Al Sulaimani
Summary: This paper provides an overview of research on the core from Oman Drilling Project Hole BT1B and the surrounding area, and presents new data and calculations to constrain processes in the Tethyan subduction zone beneath the Samail ophiolite. The study reveals the formation of important reservoirs for subducted CO2 in the area and suggests that the processes could lead to aseismic subduction and significant changes in rock mass and volume.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Michael Spath, Janos L. Urai, Britta Nestler
Summary: This work presents a comprehensive phase-field study on the formation of multi-crack-seal veins in quartz microstructures. It explores the effects of fracture aperture, crystal orientation, and sealing state on the morphology of the forming grain boundaries. The study successfully reproduces a wide range of crystal structures frequently observed in natural quartz veins using a combined crack-seal phase-field model.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Michael Spaeth, Janos L. Urai, Britta Nestler
Summary: This study investigates the mechanisms of cyclic microfracturing and epitaxial crystal growth in crack-seal veins using a phase-field model. The sealing degree is found to be a key parameter in hydrothermal systems, and multi-crack-seal veins exhibit mechanical weakness in rocks.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Michael Spaeth, Michael Selzer, Benjamin Busch, Daniel Schneider, Christoph Hilgers, Janos L. L. Urai, Britta Nestler
Summary: Fluid flow in fracture porosity in the Earth's crust can lead to crystallization or dissolution depending on the saturation state. The evolution of the microstructure affects the transport and mechanical properties of rocks, but the understanding of this coupled system is incomplete. In this study, we simulate laboratory experiments at the grain scale to investigate crystal growth in fractures during reactive flow. By using a multiphase-field modeling approach, we accurately capture the varying growth rate along the fracture due to saturation differences. These simulations provide valuable insights for upscaling to larger scale computations and have potential applications in groundwater protection, geothermal energy, hydrocarbon reservoir prediction, water recovery, and subsurface storage of H-2 or CO2.
WATER RESOURCES RESEARCH
(2023)
Article
Geochemistry & Geophysics
Jessica Barabasch, Joyce Schmatz, Jop Klaver, Alexander Schwedt, Janos L. Urai
Summary: Based on the microstructural analysis of Zechstein rock salt from the northern Netherlands, the study reveals that rheology of salt rock is strongly influenced by grain size, indicating the significance of pressure solution and dislocation creep in different grain sizes. This finding is important for predicting the long-term deformation of solution-mined caverns and radioactive-waste repositories in rock salt, contributing to the energy transition. It is recommended to include grain-size-dependent rheology more consistently in constitutive laws describing the deformation of rock salt.
Article
Geochemistry & Geophysics
Sivaji Lahiri, Kitty L. Milliken, Peter Vrolijk, Guillaume Desbois, Janos L. Urai
Summary: The input sediments of the North Sumatra subduction zone margin exhibit remarkable uniformity in composition and grain size. The study shows that compaction proceeds by micromechanical processes and there is no evidence of deformation or fracturing during the compaction process.
Article
Geochemistry & Geophysics
Manuel D. Menzel, Janos L. Urai, Estibalitz Ukar, Thierry Decrausaz, Marguerite Godard
Summary: The formation of listvenite (quartz-carbonate rock) from serpentinized peridotite through the reaction with CO2 bearing fluids requires a large amount of fluid flux and significant permeability despite the increase in solid volume. This study on listvenite and serpentinite samples from Hole BT1B of the Oman Drilling Project reveals the mechanisms and feedbacks during vein formation in this process. It is found that the earliest structures to form during carbonation of serpentinite are antitaxial, zoned magnesite veins with elongated grains growing from a median zone towards the wall rock. The presence of voids and dolomite precipitation along the vein-wall rock interface indicates that these veins acted as preferred fluid pathways for the infiltration of CO2-rich fluids necessary for carbonation to progress.
Article
Geochemistry & Geophysics
Lisa Winhausen, Kavan Khaledi, Mohammadreza Jalali, Janos L. Urai, Florian Amann
Summary: This study investigates the failure mode of Opalinus Clay under different stress conditions. The results show a transition from brittle to ductile deformation with increasing stress, and the deformation localizes in distinct shear bands. The study also reveals less dilation in the shear zones at higher stresses.
Article
Geochemistry & Geophysics
Lisa Winhausen, Jop Klaver, Joyce Schmatz, Guillaume Desbois, Janos L. Urai, Florian Amann, Christophe Nussbaum
Summary: The microphysics-based study on Opalinus Clay reveals that deformation mechanisms are controlled by both brittle and ductile processes, leading to the formation of networks of deformation bands with widths up to tens of micrometres. The compaction and local dilation effects have a significant impact on permeability, while additional solution-precipitation processes may operate during long-term deformation.
Article
Geochemistry & Geophysics
Rahul Prabhakaran, Giovanni Bertotti, Janos Urai, David Smeulders
Summary: Rock fractures form networks with natural spatial variation. A novel approach is introduced to quantify spatial variation within large-scale 2-D fracture networks. The results indicate spatial autocorrelation with localized spatial clusters that gradually vary over distances of tens of metres. The proposed method provides a quantitative way to identify spatial variations in fracture networks and guide fracture network modeling approaches.
Article
Geochemistry & Geophysics
Marta Adamuszek, Dan M. Tamas, Jessica Barabasch, Janos L. Urai
Summary: The study shows that impurities and layer thickness variations can significantly affect fold development in rock salt. Dark layers containing more impurities exhibit higher viscosities and influence the fold morphology. Furthermore, fold development is also influenced by the magnitude of deviatoric stress and impurity content.
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)