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Geochemical signatures and contamination levels of rare earth elements in soil profiles controlled by parent rock and soil properties.
Environ Sci Pollut Res Int
January 2025
Department of Agricultural Chemistry, National Taiwan University, Taipei, 106319, Taiwan.
Rare earth elements (REEs) are emerging contaminants rendering potential risks in soils to environmental quality and human health. The causation between their geochemical signatures and contamination levels with parent rocks and soil properties are critical for REEs risk assessments, which are urgently needed globally. Thus, this study aimed to elucidate cause-and-effect among hydrofluoric-acid-digested total and ethylenediaminetetraacetic acid extracted bioavailable soil REEs and their contamination degree evaluated by pollution indices in 268 soil layer (horizon) samples from 50 soil profiles derived from felsic, intermediate, mafic, ultramafic, and sedimentary rocks in Taiwan.
View Article and Find Full Text PDFNumerical analysis of the hydraulic fracture propagation behavior encountering gravel in conglomerate reservoirs.
Sci Rep
January 2025
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China.
Hydraulic fracturing, which forms complex fracture networks, is a common technique for efficiently exploiting low-permeability conglomerate reservoirs. However, the presence of gravel makes conglomerate highly heterogeneous, endowing the deformation, failure, and internal micro-scale fracture expansion mechanisms with uniqueness. The mechanism of fracture expansion when encountering gravel in conglomerate reservoirs remains unclear, challenging the design and effective implementation of hydraulic fracturing.
View Article and Find Full Text PDFDiffusion coefficient measurements for moving samples under strong magnetic field gradients.
J Magn Reson
January 2025
São Carlos Institute of Physics, University of São Paulo São Carlos São Paulo Brazil.
Among the numerous measurements carried out during a well-logging procedure, the Nuclear Magnetic Resonance (NMR) assessment is one of the fundamental analyses in determining the economic viability of a well for the oil industry. Nowadays, two reliable approaches, Wireline Logging (WL) and Logging While Drilling (LWD), stand out. WL comprises the acquisition of NMR data under static conditions.
View Article and Find Full Text PDFUnlocking seismic slope stability for risk assessment.
MethodsX
June 2025
National Advanced IPv6 Centre (Nav6), School of Computer Sciences, Universiti Sains Malaysia, 1800 Penang, Malaysia.
Slope instability represents a substantial secondary hazard post-earthquake, leading to considerable socio-economic losses from the destruction of structures, infrastructure, and human lives. This study addresses the urgent need for precise evaluation of seismic slope stability, a subject that has gained significant attention in earthquake engineering over the past decade. A theoretical framework is proposed that utilizes an improved Sarma method, estimating seismic forces and safety factors based on limit equilibrium theory.
View Article and Find Full Text PDFStudy on the mechanical properties and failure mechanism of a multi-lithologic layered rock mass.
Heliyon
January 2025
Shale Gas Research Institute of PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan, 610051, China.
The mechanical properties of multi-lithologic reservoir rock masses are complex, and the failure mechanism is not clear. This research belongs to the field of oil and gas exploration and development. Brazilian splitting, and digital image correlation (DIC) tests were performed to study the mechanical properties and failure mechanism of assemblages containing sandstone, shale, and limestone.
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