Article
Geology
Hassan A. Eltom, M. Rika Nanda Syahputra, Ammar El-Husseiny, Andrew D. La Croix
Summary: This study investigates the spatial variability of porosity and permeability in bioturbated carbonate rocks using a combination of field observations, imaging techniques, and petrophysical measurements. The study reveals that different burrowing styles, pipe framework and bio-retexturing, control the porosity and permeability characteristics of the rocks. These findings are important for understanding the fluid flow quality of bioturbated carbonates, which are significant aquifers and hydrocarbon reservoirs globally.
SEDIMENTARY GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Mohamed A. Yassin, Jarvis Cline, Mohammed H. Alghamdi, Lundi Kusuma, Ali E. Al-Mahfoudh
Summary: This study introduces a workflow for modeling bioturbated strata in the Hanifa Formation in central Saudi Arabia, filling a gap in numerical modeling. The workflow incorporates various observations and simulations to model burrow abundance, porosity, and permeability. The results highlight the importance of correct permeability modeling for accurately simulating bioturbated reservoirs, which can aid in managing hydrocarbon reservoirs and water aquifers.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Sardar M. Balaky, Maha M. Al-Dabagh, Irfan Sh. Asaad, Mazin Tamar-Agha, Mohammed S. Ali, Ahmed E. Radwan
Summary: This research emphasizes the significance of sedimentological and petrophysical heterogeneity in carbonate oil exploration in northwestern and northern Iraq.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Ammar El-Husseiny, Hassan Eltom, Abdullah Alqubalee, Ammar Abdlmutalib, Hani Al-Mukainah, Rika N. Syahputra
Summary: The study investigates the influence of bioturbation intensity and burrow-fills on the elastic velocity of carbonate strata in the Hanifa Formation in central Saudi Arabia. The results show that changes in bioturbation intensity lead to variations in permeability and velocity of the carbonate strata, allowing for the classification of different units. The study also presents a method based on rock-physics modeling and differential effective medium theory to identify rocks with specific properties based on their velocity-porosity characteristics.
NATURAL RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Robert H. Goldstein
Summary: Recent evaluations have shown that the morphology, abundance, and size of burrows have an impact on the sampling scheme for measuring permeability in the laboratory. This study introduces a new approach using multipoint statistics modeling to simulate various burrow abundances and sizes in Thalassinoides and develop a statistical model for sampling design. Logistic regression modeling is applied to analyze the data and provide an equation that predicts the probability of burrow connectivity in samples.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Hassan A. Eltom, Abdullah M. Alqubalee, Abdullah S. Sultan, Assad A. Barri, Khalid Abdelbasit
Summary: This study investigates the potential correlation between spot permeability and bulk permeability of burrow-related reservoirs using results from petrographic investigations, spot permeability measurements, CT scans, and core water flooding experiments. The study suggests that burrow connectivity should be considered in bulk permeability estimation, and that the permeability of the passive fills of the Thalassinoides network is substantially higher than that of the surrounding matrix.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Mohamed O. Abouelresh, Mohamed Mahmoud, Ahmed E. Radwan, Thomas J. H. Dodd, Lingyun Kong, Hatem F. Hassan
Summary: This study investigates the porosity characteristics of the organic-rich carbonate-dominated Hanifa Formation in the Jafurah Basin, Saudi Arabia. It reveals that the formation has high porosity and hydrocarbon content, suggesting its potential for gas exploration and recovery.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Jack G. Murphy, Anne-Sofie C. Ahm, Peter K. Swart, John A. Higgins
Summary: The records of lithium isotopic composition in seawater preserved in shallow-marine carbonate sediments are valuable for studying the links between silicate weathering, clay formation, global carbon cycle, and Earth's climate over geological time. This study presents measurements of lithium isotopic composition in Neogene shallow-marine carbonates and demonstrates the effects of mineralogy and diagenetic alteration on the variability of bulk sediment δ Li-7 values. The findings suggest that robust 'snapshots' of seawater δ Li-7 values in the past can be obtained from shallow-water marine carbonate sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Sean J. Loyd, Patrick Meister, Bo Liu, Kevin Nichols, Frank A. Corsetti, Robert Raiswell, William Berelson, Graham Shields, Mark Hounslow, John W. F. Waldron, Bayne Westrick-Snapp, Jamie Hoffman
Summary: The early diagenesis of marine organic matter has a significant impact on Earth's surface chemistry, particularly in terms of carbon burial potential and the formation of authigenic minerals such as carbonate concretions. The formation of these concretions is closely related to microbial anaerobic diagenetic reactions that degrade organic matter and methane, with some reactions requiring an external oxidant. Changes in the oxidation state of Earth's oceans over time can therefore influence the mechanisms of concretion formation. Variability in the carbon isotope compositions of concretions indicates changes in diagenesis in shallow marine sediments, which is associated with the evolving redox landscape of Earth. Transport modeling helps to understand the potential effects of shifting redox chemistry and highlights the importance of organic carbon supply to the seafloor, marine sulfate concentrations, methane production, and external methane influx. The first clear evidence of anaerobic oxidation of methane-derived concretions occurred during the Carboniferous period, coinciding with the increased marine sulfate levels in the Paleozoic era. The lower variability observed in older concretions, particularly the Precambrian ones, may be attributed to a smaller marine sulfate reservoir and possibly elevated concentrations of marine dissolved inorganic carbon. The reasons behind the increase in maximum carbon isotope values over time are still not fully understood but may be related to isotopic equilibration between dissolved inorganic carbon and externally-derived methane. Ultimately, the isotopic record of concretions reflects changes in the availability of organic matter and the oxidation state of the marine environment, providing insights into the subsurface biosphere and diagenesis throughout geological time.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
M. Ingalls, J. P. Grotzinger, T. Present, B. Rasmussen, W. W. Fischer
Summary: Phosphorus is crucial for cell biology, but it is scarce in modern marine environments due to its consumption by life or formation of apatite minerals through calcium titration. In this study, we measured the phosphate concentrations in Neoarchean carbonate facies and found that carbonates from that period were significantly enriched in carbonate-associated phosphate compared to modern marine carbonates. This suggests that early biosphere productivity was limited by electron availability rather than phosphate or other nutrients, which helps explain the central role of phosphorus in cellular molecules, metabolisms, and bioenergetics.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Ahmad Ramdani, Pankaj Khanna, Gaurav Siddharth Gairola, Sherif Hanafy, Volker Vahrenkamp
Summary: This study proposes a comprehensive methodology for the three-dimensional investigation of carbonate reservoir analogues using outcrop depositional facies data integrated with geophysical data. The methodology was applied to map the morphology of stromatoporoid-coral buildups and construct a porosity model of the Hanifa reservoir analogue. The study utilized various data sets including drone imageries, measured sections, GPR, seismic profiles, and core samples.
Article
Geosciences, Multidisciplinary
M. Janssen, L. Caracciolo, L. M. Bonnell, R. H. Lander, A. Munnecke, A. Beltran-Trivino, F. Muto, H. Stollhofen
Summary: Depositional environment, climate, diagenetic processes, and sediment composition are important factors controlling the precipitation and distribution of near-surface carbonate cements. Simulation studies show that early carbonate cementation has a significant impact on compaction behavior and porosity reduction during burial, resulting in less pore loss.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Christoforos Benetatos, Giorgio Giglio
Summary: Reliable 3D modelling of underground hydrocarbon reservoirs is a challenging task due to complex geological formations and uncertainties in data. For fractured reservoirs, accurate analysis and quantification of uncertainties are necessary to provide a reliable confidence range of volumetric estimations. An integrated workflow is crucial for constructing and validating 3D numerical models of hydrocarbon-bearing reservoirs and can be beneficial for the training of young geoscientists and engineers.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Jack Stacey, Ashleigh V. S. Hood, Malcolm W. Wallace
Summary: This study uses trace and rare earth element geochemistry to determine shallow marine redox conditions during the deposition of the late Tonian Devede Formation. The findings suggest that shallow marine environments during the late Tonian Period were predominantly characterized by anoxic and euxinic conditions, making them challenging habitats for complex life forms.
PRECAMBRIAN RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Jiayi Ma, Shuyun Xie, Dan Liu, Emmanuel John M. Carranza, Zhiliang He, Mohai Zhang, Tianyi Wang
Summary: The dissolution dynamics of carbonate rocks in shallow burial are important for the formation of high-quality reservoirs, with associated minerals playing a significant role in the dissolution processes. Metal ions in acidic fluids have been found to influence fluid properties and dissolution processes, impacting reservoir quality. Additional studies are needed to further understand the impact of associated minerals on the dissolution dynamics of carbonates.
NATURAL RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Hussam Eldin Elzain, Sang Yong Chung, Senapathi Venkatramanan, Sekar Selvam, Hamdi Abdurhman Ahemd, Young Kyo Seo, Md. Simul Bhuyan, Mohamed A. Yassin
Summary: This research utilized intelligent predictive Machine Learning regression models at two levels to improve the accuracy of predicting groundwater pollution vulnerability index in the Miryang aquifer in South Korea. The models were evaluated using statistical metrics and graphical representations, and the ensemble BA model in level 2 outperformed the standalone models in level 1.
Article
Geosciences, Multidisciplinary
Lameed O. Babalola, Abdullah M. Alqubalee, Michael A. Kaminski, Osman M. Abdullatif, Mohamed O. Abouelresh
Summary: This study investigates stable oxygen and carbon isotope data from the Middle Jurassic Dhruma Formation in central Saudi Arabia to examine paleoenvironments and diagenesis impacts on isotopic signals in sedimentary rocks.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Robert H. Goldstein
Summary: This study demonstrates the scale dependence of sampling and variables important in selecting representative sample dimensions for modeling Thalassinoides reservoirs using a CT scan. The results indicate that small-diameter vertical subsamples are likely to under sample Thalassinoides networks.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Abdulwahab Muhammad Bello, Khalid Al-Ramadan, Lamidi O. Babalola, Abdullah Alqubalee, Abduljamiu O. Amao
Summary: The origin and role of clay coatings in inhibiting quartz cementation have been studied, while the role of illite coatings in porosity preservation has been neglected. This study investigates the occurrence and coverage of illite coatings and their role in inhibiting quartz overgrowth in a sandstone reservoir. The results show that both tangential and radial illite coatings effectively arrest quartz cementation, with coverage depending on grain size.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Mohamed A. Yassin, Jarvis Cline, Mohammed H. Alghamdi, Lundi Kusuma, Ali E. Al-Mahfoudh
Summary: This study introduces a workflow for modeling bioturbated strata in the Hanifa Formation in central Saudi Arabia, filling a gap in numerical modeling. The workflow incorporates various observations and simulations to model burrow abundance, porosity, and permeability. The results highlight the importance of correct permeability modeling for accurately simulating bioturbated reservoirs, which can aid in managing hydrocarbon reservoirs and water aquifers.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Robert H. Goldstein
Summary: Recent evaluations have shown that the morphology, abundance, and size of burrows have an impact on the sampling scheme for measuring permeability in the laboratory. This study introduces a new approach using multipoint statistics modeling to simulate various burrow abundances and sizes in Thalassinoides and develop a statistical model for sampling design. Logistic regression modeling is applied to analyze the data and provide an equation that predicts the probability of burrow connectivity in samples.
MARINE AND PETROLEUM GEOLOGY
(2023)
Review
Environmental Sciences
Syed Muzzamil Hussain Shah, Mohamed A. Yassin, Sani I. Abba, Dahiru U. Lawal, Ebrahim Hamid Hussein Al-Qadami, Fang Yenn Teo, Zahiraniza Mustaffa, Isam H. Aljundi
Summary: Natural hazard threats have increased due to climate change, rapid population growth, and urbanization. Recent devastating floods in Saudi Arabia, a country located in a dry environment, have shown the potential danger of flash floods in arid regions. Jeddah City, situated in the coastal plain of western Saudi Arabia, has experienced unexpected heavy rainfall events in recent years, leading to flood generation. This paper discusses the climate classifications, risk, and vulnerability of the Kingdom, as well as the impact of flash floods and the proposed strategies for flood risk management.
Article
Green & Sustainable Science & Technology
Sani I. Abba, Mohamed A. Yassin, Auwalu Saleh Mubarak, Syed Muzzamil Hussain Shah, Jamilu Usman, Atheer Y. Oudah, Sujay Raghavendra Naganna, Isam H. Aljundi
Summary: The study evaluates groundwater resources in the Al-Hassa region of Saudi Arabia and proposes an innovative approach for assessing drinking water suitability. By utilizing machine learning models and interpretability methods, it accurately predicts groundwater quality and provides valuable insights for sustainable water resource management.
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
Remote Sensing
Ahmed M. AL-Areeq, Hatim O. Sharif, S. I. Abba, Shakhawat Chowdhury, Mohammed Al-Suwaiyan, Mohammed Benaafi, Mohamed A. Yassin, Isam H. Aljundi
Summary: This study compares the performance of five distinct Global Digital Elevation Models (GDEMs) in estimating flood inundation extent and depth in the Jeddah watershed. The results show that SRTM performs the best in the mountain area.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
Article
Engineering, Multidisciplinary
Mohamed A. Yassin, A. G. Usman, S. I. Abba, Dilber Uzun Ozsahin, Isam H. Aljundi
Summary: This research utilizes various feature extraction methods and machine learning techniques to evaluate groundwater salinization. The results show that these techniques perform well in both training and validation stages, accurately predicting the salinization of groundwater.
RESULTS IN ENGINEERING
(2023)
Article
Geology
Jarrah Babiker, Michael A. Kaminski, John D. Humphrey, Khalid Al-Ramadan, Jonathan L. Payne, Abdullah Alqubalee
Summary: Shark fossil microremains belonging to the genus Lissodus have been discovered for the first time in the Lower Khartam Member of the Khuff Formation in central Saudi Arabia. The age of the Lower Khartam Member was previously assigned to the Upper Permian, making this discovery the oldest known record of the genus Lissodus. However, the stratigraphic occurrence of these fossils suggests that they may provide evidence for a revised placement of the Permian/Triassic boundary in Saudi Arabia.
Article
Multidisciplinary Sciences
Clement Afagwu, Mohamed Mahmoud, Saad Alafnan, Abdullah Alqubalee, Ammar ElHusseiny, Shirish Patil
Summary: This study investigates the role of clay's elemental concentration, purity, and types on its pore attributes. It is found that kaolinite has the highest N-2 gas capacity and can be used as a good catalytic material for esterification reactions. Montmorillonite has the largest specific surface area in non-micropores and promotes reactivity and cation exchange interaction. The clay samples have negligible micropores.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Abdullah M. Alqubalee, Lameed O. Babalola, Osman M. Abdullatif, Hassan A. Eltom
Summary: This study characterized the depositional environments of Hirnantian glaciogenic deposits using geochemical data, and investigated their provenance and tectonic setting. The research found that the sediments from different facies associations showed varying levels of maturity and weathering impacts, with important implications for reservoir quality prediction and understanding the geochemical distributions in these deposits.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(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)