Article
Environmental Sciences
Shengyang Feng, Yurong Wu, Yong Liu, Xiangyang Li, Xiaodong Wang, Puxin Chen
Summary: A novel model combining fractal theory and DFN is proposed to simulate radon migration, revealing the impact of different parameters on radon migration. Fractal dimension of fracture lengths and dip angle are identified as key factors influencing radon migration.
Article
Mathematics, Interdisciplinary Applications
Zhen Liu, Wenzhi Yang, He Yang, Peng Hu, Shuangyue Wang
Summary: This study focused on the water seepage characteristics in coal fracture networks using fractal geometry theory. A seepage model was established and validated through experiments, showing that the influence of fracture diameter ratio on permeability was significant. Overall, the study provides a theoretical basis for understanding the seepage law of high-pressure water in coal bodies and the relationship between permeability and environmental parameters.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2021)
Article
Computer Science, Interdisciplinary Applications
Israel Canamon, Tawfik Rajeh, Rachid Ababou, Manuel Marcoux
Summary: This study presents a framework for analyzing 3D Discrete Fracture Networks and developing efficient algorithms to calculate their geometrical, topological properties near percolation threshold. The calculations implemented by these algorithms have been strictly validated, leading to significant reduction in CPU time for flow/transport simulations.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Chemistry, Analytical
Alishba Sadiq, Norashikin Yahya, Tong Boon Tang, Hilwati Hashim, Imran Naseem
Summary: The nonfractal connectivity of rs-fMRI can be used to distinguish Alzheimer's patients from healthy controls, outperforming fractal and Pearson-based connectivity approaches.
Article
Energy & Fuels
Bolivia Vega, Anthony R. Kovscek
Summary: In this study, an array of fractured shale rock samples and analogs were collected to improve the numerical representation of fracture networks. The analysis of multimodal and multiscale images revealed that the origin of the fracture networks plays a crucial role in the resulting fracture systems and their scaling. The evaluation of rock analogs using descriptive tools demonstrated their faithfulness in depicting maturation-induced fracture networks.
Article
Engineering, Geological
Qingxiang Meng, Haoyu Xue, Xiaoying Zhuang, Qiang Zhang, Chun Zhu, Benguo He, Gan Feng, Timon Rabczuk
Summary: A novel two-dimensional fractal discrete fracture network (DFN) generation method based on the iterative function system (IFS) was proposed for fluid flow and transport simulations. A refinement technique was presented to achieve a fine mesh for the DFN model by removing short edges and small gaps. The injection pressure of hydraulic fracture had three phases: sudden increase, rapid drop-off, and stabilization, and the fractal DFN significantly affected the injection pressure evolution and fracture propagation compared to the traditional linear DFN model. Fracture aperture variation was found to be an important factor influencing hydraulic fracturing in the rock mass. The effects of mesh sensitivity and fracture aperture size were analyzed based on two-dimensional simulation results.
ENGINEERING GEOLOGY
(2023)
Article
Environmental Sciences
Zuyang Ye, Xincheng Fan, Jun Zhang, Jianlong Sheng, Yuting Chen, Qingli Fan, Huikai Qin
Summary: A systematic approach has been developed to estimate the relationship between permeability and connectivity in two-dimensional fracture networks using the concept of geological entropy. The entropic scale is positively correlated with permeability concerning aperture, quantifying network connectivity. Permeability is inversely proportional to length and proportional to spacing, with weak dependence on orientation.
WATER RESOURCES RESEARCH
(2021)
Article
Engineering, Chemical
Xiaoli Xu, Liqi Xu, Changqi Yue, Guannan Liu
Summary: This paper establishes a fractal permeability model considering the microstructure of coal seam fractures, and analyzes the influence of microscopic fracture structures on equivalent permeability.
Article
Multidisciplinary Sciences
Kairan Yang, Yujun Xie, Hengtao Guo
Summary: Effective evaluation metrics for measuring the efficiency of sports park distribution from a spatial perspective are lacking, resulting in low utilization rates. This study proposes a spatial accessibility-based method for evaluating sports park distribution and investigates the distribution in the central urban area of Changsha, China using GIS network analysis. Optimization strategies for sports park distribution are also developed by using spatial syntax.
Article
Engineering, Geological
Weiwei Zhu, Gang Lei, Xupeng He, Yafan Yang, Ryan Kurniawan Santoso, Moran Wang
Summary: This study investigates the fluid flow in underground fractures by examining their three-dimensional structure and two-dimensional cross-section maps. 3D fracture networks with different geometries are constructed, and their connectivity is analyzed using labeled clusters on cross-section maps. The study reveals that clustering effects have a significant impact on local intersections, but negligible effects on fracture intensities of 3D fracture networks. Empirical limits are provided to predict the fracture intensity and connectivity based on outcrop maps.
ENGINEERING GEOLOGY
(2022)
Article
Environmental Sciences
Yurong Wu, Xiaojie Chen, Qian Kang, Ming Lan, Yong Liu, Shengyang Feng
Summary: This paper develops a new two-dimensional model to estimate the radon exhalation rate of fractured porous media using fractal discrete fracture network. The model is validated with well-equipped laboratory tests and shows more effective simulation of radon migration compared with the traditional model. The effects of fracture intensity, seepage velocity, and fracture connectivity on radon migration in fractured porous media are analyzed using the model. The model provides a reliable method to analyze radon migration in fractured porous media and is helpful for radon pollution prevention and control.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Jinghua Liu, Mingjing Lu, Guanglong Sheng
Summary: Fractal theory is used to describe the distribution of volume fracture network in unconventional reservoirs, and the comparison between conventional dual-media model and fractal dual-media model in analyzing reservoir permeability and porosity. The research findings suggest that fractal parameters can more accurately describe reservoir physical properties, and the conventional dual-media model calculates relatively higher flow rates in the early stage.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Energy & Fuels
Li Tao, Li Qian, Hu Yong, Peng Xian, Feng Xi, Zhu Zjanmei, Zhao Zihan
Summary: The study examined the effects of fracture aperture, strike, and connectivity on the permeability of fractured porous media, revealing that a greater strike factor and smaller tortuosity lead to higher permeability. Moreover, higher connectivity coefficient in the fracture network results in higher permeability for fracture-pore media, with a tendency toward dominant channel effects. Ultimately, connectivity in the fracture network has a greater impact on the seepage ability of fracture-pore media compared to fracture aperture and strike.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Agronomy
Jose V. Gaspareto, Jocenei A. T. de Oliveira, Everton Andrade, Luiz F. Pires
Summary: Representative elementary volume (REV) is required for representative measurements of soil physical properties. The REV depends mainly on the land uses for porosity and pore connectivity. The core method showed lower REV due to the larger volume analyzed than that in the cube method. It was not possible to define a REV for degree of anisotropy. The REV obtained using the cube method was more sensitive to changes in the scale of analysis, showing an increasing trend with applied wetting and drying cycles for porosity and fractal dimension.
Article
Mathematics, Interdisciplinary Applications
Jian-Hui Li, Zu-Guo Yu, Vo V. V. Anh, Jin-Long Liu, An-Qi Peng
Summary: In this paper, a new random rewiring method is proposed to transform fractal networks into small-world networks. The proposed method is proven to retain the degree and connectivity of the network, as well as the tree structure of tree graphs. It demonstrates the generality of small-world networks and can be applied to various types of complex networks. This rewiring method has a broader range of applications in network analysis.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Article
Geology
Hyojong Lee, Seung-Ik Park, Taejin Choi, Min Sub Sim
Summary: The study demonstrates that the Nampo Group in the western Korean Peninsula mainly originated from nearby felsic igneous rocks or geochemically similar migmatitic basement gneisses, while the Gimpo Group and Seokmun Formation were largely sourced from (meta-)sedimentary rocks. The youngest zircon groups in the Nampo Group and the overlying Oseosan Volcanic Complex approach sedimentation ages with ascending stratigraphic order, indicating a transition from a collisional to a convergent tectonic setting during sedimentation.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geosciences, Multidisciplinary
Casey W. Nixon, Kari Naerland, Atle Rotevatn, Vilde Dimmen, David J. Sanderson, Thomas B. Kristensen
JOURNAL OF STRUCTURAL GEOLOGY
(2020)
Article
Geology
Kyung Jin Lee, Seung-Ik Park, Hyojong Lee, Yong Sik Gihm
Summary: The study of the Cretaceous Duwon Formation through sedimentologic analysis revealed the geological conditions for the development of a streamflow-dominated alluvial fan under arid to semi-arid climatic conditions. The formation was interpreted to have been deposited in gravelly braided streams near the basement, transitioning to sandy braided streams and floodplain environments further away. The detrital zircon chronology suggests sediments were derived from the southwestern part of the Korean peninsula, indicating a large drainage basin supplying significant water and sediments to the fan.
ECONOMIC AND ENVIRONMENTAL GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Xiaodong Yang, David J. Sanderson, Lisa C. McNeill, Frank J. Peel
Summary: The conventional area-balancing method is not applicable to most fold-thrust belts, which exhibit a wedge or trapezium shape in cross section. The study finds that the initial wedge taper is crucial in determining the shortening across a fold-thrust belt and needs to be independently constrained.
Article
Geosciences, Multidisciplinary
Inho Kim, Seung-Ik Park, Sanghoon Kwon, Hong-Jin Lee
Summary: This study investigates the characteristics and evolution of fold-related fracture networks in the Sinon Anticline, South Korea. The complexity of the fracture networks reflects the spatiotemporal variation in strain pattern, and their connectivity and fluid flow properties are controlled by structural positions and mechanical stratigraphy.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Namgwon Kim, Seung-Ik Park, Jin-Hyuck Choi
Summary: Deciphering the internal composition of large-scale fault zones is crucial in understanding their seismic rupture behavior. The study of the Southern Yangsan Fault in Korea revealed variations in fault zone architecture and rupture processes along the fault, influenced by differences in wall rock lithology. This emphasizes the importance of intrinsic discontinuities and mineralogy in controlling long-lived rupturing patterns in fault zones.
Article
Geology
Chae-Eun Park, Seung-Ik Park
Summary: This study investigated the spatial variation in geometry and connectivity of the fracture system near the Baekildo fault using circular sampling and topological analysis. The research found that the intensity and connectivity of the fracture system in tuffaceous sandstone are higher than in lapilli tuff, and the orientation dispersion, intensity, and average length of fracture sets vary depending on the along-strike position in the tuffaceous sandstone. Curved fractures abutting the fault at a high angle occur at fault bends, indicating geometric irregularities can concentrate stress and lead to curved fractures.
ECONOMIC AND ENVIRONMENTAL GEOLOGY
(2021)
Review
Geology
Yujung Kwak, Seung-Ik Park, Changyun Park
Summary: This review introduces the suction pump and fault valve models as fluid circulation mechanisms causing hydrothermal gold deposits in the frameworks of fault mechanics. These models describe faulting-driven fluid flow and vein formation mechanisms, and provide a method to interpret the origins of hydrothermal gold deposits.
ECONOMIC AND ENVIRONMENTAL GEOLOGY
(2022)
Article
Geology
Yong Sik Gihm, Seung-Ik Park
Summary: This study examined the deposition processes of pyroclastic density currents entering lacustrine environments in the Cretaceous Jeonggaksan Formation. The results showed that the deposition of the welded massive lapilli tuff was the result of rapid settling of highly concentrated pyroclastic sediments, while the normally graded lapilli tuff was formed by water-saturated turbidity currents.
ECONOMIC AND ENVIRONMENTAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Sung Won Kim, Bo Young Lee, Kyoungtae Ko, M. Santosh, Weon Seo Kee, Seung-Ik Park, Seung Hwan Lee, Byung Choon Lee, Hee Jae Koh, Youn-Joong Jeong
Summary: The Early Neoproterozoic supracrustal metasedimentary succession in the Paju-Yangju-Dongducheon area of the central Korean Peninsula has similarities with the southeastern North China Craton in terms of detrital zircon records and litho-tectonic features, suggesting deposition in marginal shallow marine to fluvial environments. However, metamorphic overgrowths and compressional collision tectonics in the Late Permian to Triassic are related to later tectonic activities.
PRECAMBRIAN RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Namgwon Kim, Seung-Ik Park, Chang Soo Cho, Youngbeom Cheon, Alexander L. Peace
Summary: Transpression occurs in response to oblique convergence across deformation zones, and in this study, the neotectonic crustal deformation pattern in the south-eastern Korean Peninsula is analyzed using seismic and paleoseismic data. The results show that the crustal deformation is mainly caused by reverse faults and strike-slip faults. Some major faults, although misoriented, still accommodate significant transpressional strain.
GEOSCIENCE FRONTIERS
(2023)
Article
Geology
Yujung Kwak, Seung-Ik Park, Jeong-Yeong Park, Taejin Choi, Eun Hye Jeong
Summary: This study presents the revised geology and new isotopic ages of the northeastern Chungnam Basin. Future work on (micro)structural and geochronological analysis is proposed to further understand the relationship between tectonic processes, basin evolution, and hydrothermal fluid migration in the southwestern Korean Peninsula.
ECONOMIC AND ENVIRONMENTAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
D. C. P. Peacock, David J. Sanderson, Bernd Leiss
Summary: Field exposures provide useful information about sub-surface reservoirs. Analogue studies should have clear objectives and collaboration with other disciplines. Choosing an analogue involves considering multiple factors. Fieldwork should focus on solving specific issues related to understanding EGS.
Article
Geosciences, Multidisciplinary
D. C. P. Peacock, David J. Sanderson, Bernd Leiss
Summary: In the pre-drilling stage of a geothermal reservoir, inferences about likely structures and their effects on fluid flow are made using simple mechanical modelling. Mohr diagrams are utilized to show the types and orientations of fractures likely to be reactivated or generated under different fluid pressures and stresses. This modelling approach helps geoscientists consider, model, and predict the mechanical properties of rock, stresses, fluid pressures, and resultant fractures in the sub-surface.
Article
Geochemistry & Geophysics
Penelope I. R. Wilson, Robert W. Wilson, David J. Sanderson, Ian Jarvis, Kenneth J. W. McCaffrey
Summary: Shallow-level igneous intrusions can have significant impacts on deformation structures and porosity of sedimentary rocks within a basin. This study reveals that the intensity of deformation bands increases and porosity decreases as the distance to the intrusion decreases, which may hinder fluid flow within the reservoir unit.