Article
Multidisciplinary Sciences
Abdullah Alqubalee, Anas Muhammad Salisu, Abdulwahab Muhammad Bello, Abdulkarim Al-Hussaini, Khalid Al-Ramadan
Summary: This study investigates the characteristics, distribution, and origin of ferruginous deposits found in the Late Ordovician glaciogenic Sarah Formation and surrounding deposits in central Saudi Arabia. Several types of ferruginous deposits have been identified, including solid and rinded concretions, pipes, layers, ferricretes, liesegang bands, and fracture infills. Goethite was the dominant iron oxide mineral in all ferruginous deposits. Compared to ferruginous deposits reported in different depositional settings, the studied ferruginous deposits in an ancient glaciogenic setting exhibit different mineralogical characteristics.
SCIENTIFIC REPORTS
(2023)
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
Materials Science, Multidisciplinary
Ippei Maruyama, Amr Meawad, Toshiaki Kondo, Shohei Sawada, Patricie Halodova, Alica Fedorikova, Takahiro Ohkubo, Kenta Murakami, Takafumi Igari, Elena Tajuelo Rodriguez, Koki Maekawa, Kiyoteru Suzuki
Summary: This study investigates the alteration of felsic sandstone-type rock, which is used as a coarse aggregate in concrete, subject to the effects of gamma-ray and neutron irradiation. The effects of gamma-ray and neutron irradiation on the physical properties of the sandstone aggregates were studied, and it was found that neutron irradiation caused more pronounced alterations than gamma-ray irradiation. The presence of intergranular and intragranular cracks in the aggregates was confirmed by microscopy images.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Astronomy & Astrophysics
Rajdeep Agrawal, Haveesh Singirikonda, Shantanu Desai
Summary: This study stacked spectral lag data from 37 Gamma-Ray Bursts to investigate a possible Lorentz invariance violation. The results did not provide decisive evidence for such a violation, and the analyses showed differences in the evidence for Lorentz invariance violation under different models and assumptions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Multidisciplinary Sciences
O. J. Roberts, P. Veres, M. G. Baring, M. S. Briggs, C. Kouveliotou, E. Bissaldi, G. Younes, S. I. Chastain, J. J. DeLaunay, D. Huppenkothen, A. Tohuvavohu, P. N. Bhat, E. Gogus, A. J. van der Horst, J. A. Kennea, D. Kocevski, J. D. Linford, S. Guiriec, R. Hamburg, C. A. Wilson-Hodge, E. Burns
Summary: Observations of a giant flare associated with the starburst galaxy NGC 253 suggest a probable connection with relativistic plasma within a magnetar. Experimental findings are consistent with expected characteristics for giant flares from extragalactic magnetars.
Article
Astronomy & Astrophysics
Rahul Gupta, S. R. Oates, S. B. Pandey, A. J. Castro-Tirado, Jagdish C. Joshi, Y-D Hu, A. F. Valeev, B. B. Zhang, Z. Zhang, Amit Kumar, A. Aryan, A. Lien, B. Kumar, Ch Cui, Ch Wang, Dimple, D. Bhattacharya, E. Sonbas, J. Bai, J. C. Tello, J. Gorosabel, J. M. Castro Ceron, J. R. F. Porto, K. Misra, M. De Pasquale, M. D. Caballero-Garcia, M. Jelinek, P. Kubanek, P. Yu Minaev, R. Cunniffe, R. Sanchez-Ramirez, S. Guziy, S. Jeong, S. N. Tiwari, S. Razzaque, V Bhalerao, V. C. Pintado, V. V. Sokolov, X. Zhao, Y. Fan, Y. Xin
Summary: A detailed analysis of multiwavelength observations of GRB 140102A with a reverse shock signature has been presented, showing changes in the peak energy and characteristics of the host galaxy. The study provides insights into the properties of the shocks, Lorentz factor, magnetization parameters, and ambient density of the GRB, indicating a moderately magnetized baryonic dominant jet composition.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Liang Li
Summary: This study reanalyzes a sample of GRB spectra and compares the BAND model with the COMP model. The parameter distributions of the BAND-better and COMP-better spectra have inconsistent peaks, and the fitted parameters obtained by the COMP model deviate significantly from those obtained by the preferred BAND model. Therefore, the preferred model should be carefully examined in GRB spectral analysis.
ASTROPHYSICAL JOURNAL
(2022)
Article
Geography, Physical
Xinchun Liu, Mingcai Hou, Xiaolin Chang, Song Wang, James G. Ogg, Hongwei Luo, Hongrui Zhang, Caineng Mu, Yu Liu
Summary: The marine red beds of the late Ordovician exhibit diverse characteristics and are influenced by regional tectonic settings and environmental changes. These different red-colored sediment layers provide crucial information about Earth's history and environmental evolution.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Meteorology & Atmospheric Sciences
A. Lindanger, M. Marisaldi, D. Sarria, N. Ostgaard, N. Lehtinen, C. A. Skeie, A. Mezentzev, P. Kochkin, K. Ullaland, S. Yang, G. Genov, B. E. Carlson, C. Kohn, J. Navarro-Gonzalez, P. Connell, V Reglero, T. Neubert
Summary: ASIM is the first instrument in space designed to observe terrestrial gamma-ray flashes (TGFs) associated with lightning flashes, and spectral analysis of 17 TGFs detected by ASIM shows significant variations in observed fluence, with a lower limit on the maximum photon energy estimated to be 24 MeV for the analyzed TGFs. The ability to constrain the source altitude and beaming geometries of TGFs strongly depends on the distance between source and satellite, with current generation instruments having limitations in reliably determining source properties without simultaneous measurements in the radio band.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Astronomy & Astrophysics
Shen-Shi Du, Lin Lan, Jun-Jie Wei, Zi-Min Zhou, He Gao, Lu-Yao Jiang, Bin-Bin Zhang, Zi-Ke Liu, Xue-Feng Wu, En-Wei Liang, Zong-Hong Zhu
Summary: The spectral lags of gamma-ray bursts have been considered as a potential method to test Lorentz invariance violations, with a new approach proposed to directly fit the spectral-lag behavior of a GRB to determine intrinsic time lag and quantum-gravity energy scales. A global fitting analysis of GRB 190114C using a Bayesian approach shows strong evidence for spectral-lag transitions and provides robust constraints on LIV coefficients, albeit somewhat weaker than existing bounds. Further observations of GRBs with higher-energy emissions and temporal resolutions are expected to refine intrinsic time lag formulation and strengthen LIV constraints in the photon sector.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Tuomas Kangas, Andrew S. Fruchter
Summary: This study examined 21 gamma-ray burst afterglow light curves at radio frequencies and compared them to X-ray and optical properties as well as to the standard jet/fireball model predictions. The results showed that most events in the sample were incompatible with conventional afterglow theory predictions for radio light-curve behavior, with only one radio afterglow displaying the expected decline. More multiwavelength data is needed for further research on this topic.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Bjoern Biltzinger, J. Michael Burgess, Jochen Greiner
Summary: Since its launch in 2002, the INTEGRAL satellite has detected many GRBs and presented an up-to-date catalogue of these bursts. The SPI instrument on board the satellite has high energy coverage and resolution, which improves the modelling of the spectral curvature and provides insights into the emission mechanism of GRBs. The SPI data analysis shows that a physical synchrotron model fits the GRB data well.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Fen Lyu, Ji-Gui Cheng, En-Wei Liang, Can-Min Deng, Tao An, Qing Lin
Summary: This paper investigates the puzzling variations in spectral shapes and energy distributions of FRB 20121102A, and uses Monte Carlo simulations to find that a single power-law function is adequate to model the energy distribution. The variations in observed spectral indices and energy distributions with different telescopes are due to both physical and observational reasons.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
X. Z. Chang, Z. Y. Peng, J. M. Chen, Y. Yin, D. Z. Wang, H. Wu
Summary: By studying multiflare gamma-ray bursts, it was found that they have positive lags with lag times greater than pulses, suggesting the existence of other physical mechanisms. The results indicate that X-ray flares share similar properties with GRB pulses, supporting the hypothesis that they have the same physical origin.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Alina Nawaz, Saeeda Sajjad
Summary: This article addresses the question of the degree of magnetization of the jets in Gamma-Ray Burst (GRB) physics, focusing on GRB 150902A. The results of spectral analysis indicate the presence of a strong magnetic component in the initial outflow, allowing for further study and constraints on the properties of the outflow.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Abdullah Alqubalee, Mohamed A. Yassin
Summary: The comprehensive study of late Kimmeridgian bioturbated strata in the upper Hanifa Formation suggests that grain-dominated burrow fills enhance porosity and permeability, with Thalassinoides dominating the studied strata. Bioturbation intensity is positively correlated with bulk permeability, indicating the potential for mud-dominated units to form flow zones in subsurface reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Hassan A. Eltom, Abdullah M. Alqubalee, Lameed O. Babalola
Summary: This study investigated how 2D views reflect actual bioturbation intensity using MPS models and a large number of 2D model slices. The results indicated that a linear scale approach resulted in significant errors in the estimation of bioturbation intensity, while a conventional nonlinear scale scheme had relatively lower errors. Furthermore, the error in bioturbation intensity estimation was found to depend on the actual intensity in 3D models and the orientation of 2D slices, regardless of burrow morphology.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Ammar Abdlmutalib, Osman Abdullatif, Abdullah Alqubalee, Luis Gonzalez, John Humphrey
Summary: Storm-wave sediments are considered a potential unconventional resource in the Middle East region, specifically in the early Silurian Qusaiba Member of the Qaliba Formation in Saudi Arabia. This study identifies seven lithofacies and interprets them as storm-wave-dominated distal, medial, and proximal shelf deposits. The results reveal two main types of pore systems that are recognized across all lithofacies.
MARINE AND PETROLEUM GEOLOGY
(2021)
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
Energy & Fuels
Mahmoud Elsayed, Ammar El-Husseiny, Ibrahim Kadafur, Mohamed Mahmoud, Murtada Saleh Aljawad, Abdullah Alqubalee
Summary: The presence of paramagnetic ions in sandstone reservoirs causes internal gradient, affecting the interpretation of NMR-derived petrophysical properties. The magnitude and effect of internal gradient are more pronounced in 12 MHz measurements compared to 2 MHz. Porosity estimates are unaffected by internal gradient and magnetic field strength. Significant discrepancies in T-2, T-LM between 2 and 12 MHz measurements were observed.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geology
Hassan Abdalla Eltom, Abdullah Mohammed Alqubalee
Summary: This study examines the quantitative variability in burrow percentage estimated using 2D views of a core from Thalassinoides-bearing strata in central Saudi Arabia. The results show that the estimated burrow percentage varies among different 2D views, but there is no significant difference between vertical and horizontal slices. The study also proposes a statistical method to quantify the uncertainty associated with estimating the burrow percentage from 2D views.
Article
Geosciences, Multidisciplinary
Mohammed Hail Hakimi, Abbas F. Gharib, Mohammad Alqudah, Adeeb Ahmed, Baleid Ali Hatem, Khairul Azlan Mustapha, Nor Syazwani Zainal Abidin, Aref Lashin, Nura Abdulmumini Yelwa, Abdullah M. Alqubalee
Summary: This study focuses on organic matter in chalky marls of the Wadi Shallala Formation in northern Jordan, revealing the potential for petroleum production. The samples primarily consist of Types-II and -I kerogen, with high levels of total organic carbon and hydrogen index. The chalky marl samples exhibit signs of early-stage sulfur-rich oil generation within the oil generation window.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Abdullah Alqubalee, Jaber Muharrag, Anas Muhammad Salisu, Hassan Eltom
Summary: This study documented and contributed to the understanding of the impact of Ophiomorpha on reservoir quality in tidal channel deposits. The results showed that the textural and mineralogical characteristics of Ophiomorpha walls may negatively impact the petrophysical properties of the deposits.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geology
M. Rika Nanda Syahputra, Hassan A. Eltom, Ammar El-Husseiny, Michael A. Kaminski, Abdullah M. Alqubalee
Summary: This study investigates the spatial patterns of burrowed strata in a middle carbonate ramp through field investigation and laboratory analysis. The results reveal similar spatial stratigraphic patterns of the studied stratum over the study area, but distinct variations in rock composition, burrow percentage, and burrowing styles. The variations are interpreted to be controlled by sea-level change and seafloor topography, providing insights into the nature and controls on the spatial patterns of burrowed strata.
SEDIMENTARY GEOLOGY
(2022)
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
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
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
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)