Article
Mathematics, Interdisciplinary Applications
Huibo Song, Shasha Nie, Yi Jin, Xiangyu Zhang, Hongliang An
Summary: The study established fractal topography in Zoophycos and proposed a fractal dimension (D) model, analyzing the correlation of D with paleo-water depth and substrate consistency. The results showed that D increases with paleo-water depth, but decreases when substrate consistency increases.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Junzhe Wang, Anning Zhou, Guoyang Liu, Zongxing Song, Chao Ma, Dan Wang
Summary: In this study, a fractal hypothesis with optimized structure was proposed based on the activated carbon pore-forming mechanism, and a pore fractal growth model for the activated carbon activation process was established. The experimental results verified the feasibility of this model.
Article
Materials Science, Multidisciplinary
Yiwei Yang, Bowen Wang, Qiaoming Yuan, Dunwen Huang, Hui Peng
Summary: This study investigates the influence of various factors on the pore structure of fly ash-based geopolymer. The results show that a smaller activator modulus and liquid-solid ratio, and higher activator concentrations lead to a finer pore structure. Increasing the conserving temperature within a certain range reduces the pore diameter and porosity, but excessive temperature increase has the opposite effect. The fractal dimension comprehensively characterizes the pore structure, and the microporous pore surface fractal dimension shows a better correlation with compressive strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Jiyoung Kim, Seongcheol Choi
Summary: The permeability of cementitious materials is crucial in evaluating durability, and it is influenced by the internal pore structure. An improved methodology based on fractal theory is proposed for virtually reconstructing the three-dimensional pore structures of ordinary Portland cement (OPC) pastes and predicting permeability. The accuracy of pore structure reconstruction is highest when using five types of base fractal units (BFUs) based on the fractal dimensions of pore-size distribution and pore tortuousness. Various geometric parameters significantly affect the permeability predictions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jian-Xin Fu, Kun Wang, Jie Wang
Summary: In this study, Lf-NMR was used to continuously detect fly ash slurry for 72 h to observe the changes of internal gel water and capillary water, and analyze the pore structure combined with fractal dimension. UCS tested the fly ash cement backfill (FACB), and the composition and microstructure evolution of hydration products were analyzed by combining porosity and SEM. The results confirm that the influence of FA on the hydration process increases gradually with time, and fly ash can delay the solidification and hardening of cement slurry. The proper proportion (10%) of FA has a lower fractal dimension and complexity of pore structure. Excessive FA proportion leads to the reduction of cementing products, increased surface roughness, high porosity, the decline of strength, and enhanced ductility.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Yuxuan Zhou, Shugang Li, Yang Bai, Hang Long, Yuchu Cai, Jingfei Zhang
Summary: This study investigated the pore structure parameters of low-rank coal with different metamorphism grade using mercury injection, N-2 adsorption, and CO2 adsorption methods. The results showed that the pore volume and specific surface area of low-rank coal were controlled by micropores and exhibited obvious fractal characteristics. Fluctuations in the comprehensive fractal dimension, specific surface area, and pore volume occurred within the range of R-max = 0.50% to 0.65% with the influence of coalification process.
Article
Engineering, Chemical
Weizheng Gao, Xiangchun Chang, Pengfei Zhang, Zhongquan Liu, Zhiping Zeng, Yue Wang, Tianchen Ge
Summary: Investigations were conducted on shale samples collected from the HSX1 well in the Hashan region to determine the microscopic pore structure and its heterogeneity. The results showed that the shales mainly consist of quartz, plagioclase, calcite, and clay minerals. The primary pore types are intergranular and intragranular pores, while organic matter pores are rare. Different types of shale pore size distributions and heterogeneity were observed. The content of plagioclase, clay minerals, and quartz were found to affect the heterogeneity of micro- and mesopores and macropores.
Article
Energy & Fuels
Zining Zhou, Jiaxun Liu, Guoqing Chen, Xiuchao Yang, Xinyu Zhong, Jianguo Liu, Xiumin Jiang
Summary: In this study, synchrotron radiation-based small angle X-ray scattering (SAXS) was used to characterize the products of superfine pulverized coal during solvent extraction, focusing on pore structure (solid state) and aggregate configurations (liquid state) evolution. The results revealed that the fractal dimensions of pore surfaces were closely related to pore sizes and corresponding quantity distributions. The research also showed the extraction effect of different solvents on anthracite coal and bituminous coal, as well as the impact of particle size on extracted aggregate radii. Overall, the study provides insights into the molecular-level characterization of coal and residue pore structures and enhances understanding of solvent extraction mechanisms.
Article
Mathematics, Interdisciplinary Applications
Wenhui Song, Jun Yao, Kai Zhang, Yongfei Yang, Hai Sun
Summary: We proposed the concept of throat fractal dimension and applied it to predict permeability in porous media. Fractal dimensions based on total pore space, pore system, and throat system were calculated using the 3D box-counting method. Comparing the permeabilities estimated by different fractal parameters, we found that the proposed throat system fractal parameter can more accurately predict fluid transport properties.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Tian Dong, Lei Kang, Yifan Zhang, Yuan Gao
Summary: The evaluation of pore characteristics in lacustrine shales is important for shale oil and gas exploration. However, there have been limited reports on the quantitative evaluation of lacustrine pores due to complex depositional environments. In this study, experiments were conducted on lacustrine shale core samples to quantitatively characterize the pores. The results provide a reference for shale oil evaluation and complement studies on lacustrine pore characteristics.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Jing Bi, Can Du, Yu Zhao, Chaolin Wang, Shuailong Lian, Xiaohui Xiong
Summary: This study investigates the influence of periodic thermal loading on the shear behavior of sandstone through direct shear tests and acoustic emission techniques. It is found that the shear resistance of samples subjected to periodic heating and cooling is lower compared to continuous heating. The peak shear strength and stiffness are greatly affected by temperature and thermal loading methods, while the ultimate shear strength remains largely unaffected. Analysis of the evolution in pore structure reveals distinct fractal characteristics of mesopores and macropores, which are influenced by heating temperature and periodic thermal loading.
ENGINEERING GEOLOGY
(2023)
Article
Mathematics
Lei Song, Yongsheng Gu, Lei Zhang, Xiangyu Wang
Summary: A permeability model with fractal characteristics (FCP model) for deep coal based on nuclear magnetic resonance (NMR) is established in this study. The coal samples consist mainly of micrometer and nanometer pores, with adsorption pores accounting for the largest proportion followed by percolation pores and migration pores. The FCP model shows significantly higher prediction accuracy compared to other three models, providing a fast and effective method for the evaluation of deep coal permeability.
Article
Geosciences, Multidisciplinary
Enran Liu, Chenglin Liu, Dishi Shi, Disi Zhu, Qiuchen Xu, Yanhong Wang
Summary: This study analyzed the pore structural heterogeneity in low-thermal-maturity shale of the Shanxi Formation using various geochemical and geological methods. The results show that the shale has mainly interparticle pores with low porosity and low permeability, and the pore structure is highly complex. Illite has a strong effect on the pore structural heterogeneity, while quartz and clay minerals have little effect. Shale with high content of illite and high porosity has lower pore structural heterogeneity, indicating it as a potential unconventional oil and gas reservoir.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Shouxu Pan, Ming Zha, Changhai Gao, Jiangxiu Qu, Xiujian Ding
Summary: This study conducted laboratory experiments on lacustrine shale samples to examine the pore structure and fractal geometry, revealing that interparticle pores and microfractures are predominant. The results showed that the pore types are relatively few and dominated by mesopores, with fractal dimension values indicating a low heterogeneity and influence from brittle minerals.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Energy & Fuels
Jiexin Lu, Chunshan Zheng, Wuche Liu, He Li, Shiliang Shi, Yi Lu, Qing Ye, Yuannan Zheng
Summary: Microwave-assisted acidification is a promising method for enhancing CBM recovery by improving pore structure and fracture connectivity in coal. It greatly increases pore volume, length, and width of fractures compared to microwave heating or acidification alone. This study demonstrates the significant potential of microwave-assisted acidification for CBM production.
Article
Geosciences, Multidisciplinary
Shubhangi Kala, Javaregowda Devaraju, Devleena Mani Tiwari, Mohammed Abdul Rasheed, Nongmaithem Lakhan
Summary: The Kommugudem shales in the Krishna-Godavari Basin on the eastern coast of India were studied to understand the source rock properties and depositional settings during the Early Permian period. The results show a shift in climate during the Early Permian, with well-preserved organic matter due to prevailing anoxia. Sedimentary biomarkers, carbon isotopes, and trace elements indicate a transition from a predominantly fluvial to a marine-influenced environment.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Shubhangi Kala, Javaregowda Devaraju, Sanjukta De, Mohammed Abdul Rasheed
Summary: The study evaluated the Kommugudem Formation in the Krishna Godavari Basin for its hydrocarbon potential and brittleness using sample laboratory and well log studies. The formation was found to have high organic carbon content, indicating good conditions for gas generation, and high mineralogical brittleness index, making it suitable for hydraulic fracturing. Well A and B showed excellent hydrocarbon generation potential, while wells C, D, E, and F had relatively lower potential and may have low gas and oil sources.
GEOLOGICAL JOURNAL
(2022)
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)
