Article
Computer Science, Interdisciplinary Applications
Weiwei Zhu, Xupeng He, Ryan Kurniawan Santoso, Gang Lei, Tadeusz W. Patzek, Moran Wang
Summary: This study digitized 80 published outcrop maps using a pixel-based fracture detection algorithm and analyzed key fracture properties. The findings provide theoretical justifications for fracture network modeling and reveal multiple power-law distributions for fracture lengths, variations in fracture orientations across scales, and spatial clustering of fracture intensities. The study also emphasizes the presence of T-type nodes in natural fracture networks, which require rule-based algorithms for simulation.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Ruud Weijermars, Jihoon Wang, Tri Pham
Summary: The study investigates the impact of pressure-loaded natural fractures on wellbore stability, analyzing the instability caused by pressure fractures and the changes in fracture propagation paths.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Computer Science, Software Engineering
Thomas Ortner, Andreas Walch, Rebecca Nowak, Robert Barnes, Thomas Hollt, M. Eduard Groller
Summary: Geologists utilize 3D Digital Outcrop Models to reconstruct ancient environments and search for signs of past life on Mars. The InCorr tool efficiently supports domain experts in tackling research questions and has the potential to significantly impact how geologists work with digital outcrop representations in the future.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2021)
Article
Chemistry, Multidisciplinary
Sulaiman A. Alarifi
Summary: This study provides a comprehensive overview and analysis of the productivity of 1216 recently abandoned multi-stage hydraulically fractured horizontal wells from five shale formations in the United States. The research utilized two decline curve analysis (DCA) methods to match actual production data, resulting in accurate production forecasts using limited early production data. By developing universal decline parameters and conducting hindcasting, the study offers insights into the production behaviors and key performance indicators of similar wells from different shale formations.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Hongwei Yang, Reyu Gao, Jun Li, Wei Lian, Boyun Guo, Wei Wang, Honglin Huang
Summary: This paper presents a comprehensive simulation and study on fractured borehole breathing using a three-dimensional geological model and the Cohesive unit method. Various parameters that may affect borehole breathing are analyzed, and several key findings are obtained, such as the viscosity of drilling fluid can effectively inhibit the occurrence of borehole breathing, and horizontal geostress influences the severity of borehole breathing.
Article
Chemistry, Multidisciplinary
Jianhua Guo, Chaoyi She, Houbin Liu, Shuai Cui
Summary: This study systematically analyzed the borehole stability issues during drilling in the dolomite formation of the Leikoupo formation in western Sichuan and established a prediction model. The research revealed the mechanism of fractured dolomite formation and its influencing factors. The generalized H-B criterion model based on acoustic waves can be used to evaluate the wellbore stability of dolomite fracture formation with multiple fracture sets.
Article
Computer Science, Interdisciplinary Applications
G. Pedone, S. Kontoe, L. Zdravkovic, R. J. Jardine, K. Vinck, T. Liu
Summary: A large-scale field testing was conducted at St Nicholas at Wade (SNW), Kent, UK to capture and better understand the behavior of piles driven in fractured low-to-medium density chalk. The study suggests that a strain-softening Mohr-Coulomb model combined with nonlocal regularization can provide a robust, accurate, and cost-effective approach for lateral loading design in fractured chalk.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Energy & Fuels
Boyu Liu, Jun Yao
Summary: This study systematically investigates the impact of H2S concentration, fractures, and lithology sequence on density-driven convection of CO2-H2S mixtures. The results demonstrate that density-driven convection is enhanced with decreasing H2S concentration and increasing fracture interaction angle and fracture conductivity ratio. The findings also show that the lithology sequence affects the shape of CO2 plumes and the curve shape of the total flux at the top boundary.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Jiaxue Li, Shuanggui Li, Lijuan Pan, Wei Gao, Jie Sun, Meng Qin
Summary: This study investigates the lost circulation mechanism of fractured strata and identifies calcite particles as the preferred plugging agent. A plugging-while-drilling technique based on calcite particles is developed for fractured formations, successfully achieving stable sealing and increased pressure-bearing capacity. The findings lay a theoretical basis for addressing lost circulation in fractured formations with important practical implications.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Thermodynamics
Lei Pu, Peng Xu, Mingbiao Xu, Jun Zhou, Chengwei Li, Qinglin Liu
Summary: This study used computational fluid dynamics-discrete element method to establish a wellbore-fracture model and investigate the flow behaviors of a plugging slurry in fractures, with a focus on the interaction between the wellbore wall and the plugging slurry. The results indicated that the evolution process of the plugging layer can be divided into four stages based on the interaction of particles, fluid, and wall. The optimization of particle combination can enhance the structural stress of the plugging layer, while the excessive liquid pressure may disrupt the stability of the initial bridging. Quantitative research on the evolution of the plugging layer provides insights for optimizing the formulation design of the plugging slurry system.
Article
Mechanics
Gerardo Severino
Summary: The study investigates the dispersion mechanism in a porous formation with steady doublet-type flow, using spatial moments to quantify the process. A simple solution is obtained by adopting simplifying assumptions, showing that dispersion in doublet-type flow is significantly larger than in single line flow.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Geosciences, Multidisciplinary
M. Hussain, A. O. Amao, K. Al-Ramadan, L. O. Babalola, J. D. Humphrey
Summary: This paper describes how chemostratigraphic markers are used to identify and separate individual lithologies in the Paleozoic tight sand and shale reservoirs in Saudi Arabia. Through scanning and analysis of core samples, 11 chemofacies within three lithofacies were identified, revealing the sedimentation characteristics under different environments.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Polymer Science
Guodong Zou, Bin Pan, Weiyao Zhu, Yuwei Liu, Shou Ma, Mingming Liu
Summary: Fracturing fluids are widely used in hydraulic fracturing of shale gas reservoirs, but the efficiency of fluid flowback is often less than 50%, which limits shale gas recovery. This study conducted microscopic experiments to simulate the flowback process of fracturing fluids in shale gas reservoirs and analyzed the mechanisms and factors affecting flowback/retention. The results showed that flowback efficiency is positively correlated with fluid concentration and gas driving pressure difference. The study also identified four mechanisms responsible for fluid retention and observed that flowback efficiency increases with higher capillary number. These findings contribute to the understanding of fracturing fluid flowback in shale gas reservoirs and provide guidance for reservoir development.
Article
Engineering, Civil
Xiaobin Ding, Kang Li, Yuxuan Xie, Shuzhuo Liu
Summary: The new 3D log-spiral model LS-M model accurately determines the minimum support pressure on the tunnel face of large shield-driven tunnels, providing more realistic collapse zone geometry than traditional wedge models. It has acceptable accuracy and simpler implementation compared to limit equilibrium analysis, and shows good agreement with previous studies and numerical analysis results.
Article
Engineering, Civil
Xiaobin Ding, Kang Li, Yuxuan Xie, Shuzhuo Liu
Summary: A new 3D log-spiral model (LS-M model) is proposed for determining the minimal support pressure on the tunnel face of a large shield-driven tunnel in rock-soil interface (RSI) composite formations. The proposed model provides a collapse zone with more realistic geometry compared to traditional wedge models and has simpler implementation compared to limit equilibrium analysis. It has been validated through comparisons with previous studies and 3D numerical analysis.
Article
Environmental Sciences
Oliver S. Schilling, Peter G. Cook, Pauline F. Grierson, Shawan Dogramaci, Craig T. Simmons
Summary: This study investigated the controls for SW-GW-vegetation interactions along intermittent rivers and ephemeral streams through numerical experiments. Results showed that infiltration is controlled by ephemerality and hydraulic conductivity (K), while transpiration is influenced by a complex interplay between ephemerality, hydraulic properties, and vegetation.
WATER RESOURCES RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Yifei Zhou, Huade Guan, Saeedeh Gharib, Okke Batelaan, Craig T. Simmons
Summary: This study investigates the cooling capacity of sea breeze and its penetration distance in the metropolitan Adelaide during summer. Results show that the sea breeze front takes around 67 minutes to penetrate the city and the cooling effect decreases as it moves inland. Multiple linear regression analysis indicates that the distance from the coast and elevation at the onshore point can explain 88% of the variability of the cooling effect in the study area.
ATMOSPHERIC RESEARCH
(2021)
Review
Geosciences, Multidisciplinary
Samira Sadat Soltani, Behzad Ataie-Ashtiani, Craig T. Simmons
Summary: This article highlights the impact of global climate change and human activities on the water cycle, emphasizing the importance of using GRACE TWS data assimilation to enhance the performance of hydrological models. It also discusses the challenges and limitations involved in assimilation, including error handling and the benefits and drawbacks of data assimilation techniques.
EARTH-SCIENCE REVIEWS
(2021)
Article
Environmental Sciences
Yun Yang, Jian Song, Craig T. Simmons, Behzad Ataie-Ashtiani, Jianfeng Wu, Jinguo Wang, Jichun Wu
Summary: This study proposes a multi-objective decision-making framework in CAM, combining simulation-optimization modeling and cost-benefit analysis to address the issue of seawater intrusion.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Editorial Material
Environmental Sciences
Anis Younes, Marwan Fahs, Philippe Ackerer
Summary: Modeling fluid flow and transport processes in porous media is a challenging task due to the complex physical processes and mathematical models involved. Continual exploration of new methods and model parameters is necessary to enhance understanding in this field.
Article
Water Resources
Xiangjuan Yang, Qian Shao, Hussein Hoteit, Jesus Carrera, Anis Younes, Marwan Fahs
Summary: This study investigates three-dimensional natural convection processes in heterogeneous porous media using a meshless Fourier series approach. By considering a large-scale Rayleigh number to account for heterogeneity, it is found that the method is highly accurate for 3D natural convection problems.
ADVANCES IN WATER RESOURCES
(2021)
Article
Water Resources
Anis Younes, Behshad Koohbor, Benjamin Belfort, Philippe Ackerer, Joanna Doummar, Marwan Fahs
Summary: The research presents a new efficient and accurate 2D numerical model for dense contaminant transport in unsaturated porous media, allowing simulation of large-scale problems with advanced spatial discretization methods and higher-order time integration techniques. This model's robustness and accuracy are demonstrated through comparison with a widely used commercial code based on the standard finite element method, and its applicability to large-scale problems is further explored through simulations of saltwater intrusion under climate change projection and long-term pumping regimes for the Akkar coastal aquifer in Lebanon using a simplified 2D conceptual model.
ADVANCES IN WATER RESOURCES
(2022)
Article
Water Resources
Anis Younes, Hussein Hoteit, Rainer Helmig, Marwan Fahs
Summary: The study developed a fully mixed finite element model for nonlinear flow and transport in unsaturated fractured porous media by spatial discretization of 2D matrix elements and 1D fracture elements and using efficient time discretization methods, addressing challenges such as infiltration of contaminated water into dry soil.
ADVANCES IN WATER RESOURCES
(2022)
Article
Environmental Sciences
Francois Lehmann, Mohammad Mahdi Rajabi, Benjamin Belfort, Frederick Delay, Marwan Fahs, Philippe Ackerer, Anis Younes
Summary: This study proposes a novel experimental setup for reconstructing multiple fracture limestone media using glass beads and parallelepiped-shaped limestone beams. Three models of transport through fractured media are investigated under different flow conditions, and the results show that only the NLMIM model is able to accurately capture the experimental results.
JOURNAL OF CONTAMINANT HYDROLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Anis Younes, Behshad Koohbor, Marwan Fahs, Hussein Hoteit
Summary: This work introduces a new model for simulating variable density flow in fractured porous media using advanced cell-centered numerical methods. The model utilizes a hybrid mixed finite element method for flow discretization in the matrix and fracture continua, and the discontinuous Galerkin method for advection-dominated transport in fractures. It ensures continuity of various properties at matrix-fracture interfaces and intersection of fractures. The model also uses high-order adaptive time integration techniques for time discretization, improving accuracy and efficiency.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Water Resources
Sara Tabrizinejadas, Anis Younes, Hussein Hoteit, Jerome Carrayrou, Marwan Fahs
Summary: Modeling dissolution processes in discrete fracture networks (DFNs) is a challenging task. In this work, an advanced Discontinuous Galerkin (DG) model is developed to simulate transport with dissolution in DFNs. The model successfully captures the nonlinear coupling between flow, mass transport, and reactive processes associated with fracture aperture evolution by dissolution. Numerical examples show that the DG-DFN model avoids unphysical oscillations and reduces numerical diffusion, providing accurate and efficient simulations of flow, transport, and aperture evolution processes in DFNs.
ADVANCES IN WATER RESOURCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Lingai Guo, Marwan Fahs, Behshad Koohbor, Hussein Hoteit, Anis Younes, Rui Gao, Qian Shao
Summary: The main goal of this paper is to extend the application of the MHFEM to HM processes in fractured domains by combining it with XFEM. The new scheme (MHFEM-XFEM) significantly reduces the computational burden and provides high accuracy compared to the standard finite element method.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Water Resources
Husam Musa Baalousha, Anis Younes, Mohamed A. Yassin, Marwan Fahs
Summary: Flood risk assessment is an important tool for urban planning, land development, and hydrological analysis, especially in arid countries where the flood risks are high. This study used GIS and the Fuzzy Analytic Hierarchy Process (F-AHP) to assess the flood risk in Qatar based on factors such as land cover, soil type, precipitation, elevation, and flow accumulation, as well as the exposure impact of land use. The results showed that the majority of urbanized areas in Qatar are within the high-risk zone, indicating the accuracy and effectiveness of the F-AHP method.
Article
Geosciences, Multidisciplinary
Anis Younes, Hussein Hoteit, Rainer Helmig, Marwan Fahs
Summary: The mixed finite element method is suitable for simulating fluid flow in heterogeneous porous media, but it can generate unphysical oscillations when used for the transport equation. This work proposes a robust upwind MFE scheme that combines the upwind finite volume method with the hybrid formulation of the MFE method. Numerical simulations show that the new scheme generates stable solutions without oscillations and is robust for solving nonlinear problems.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
