Mesoscopic mechanism of shear breakdown and static recovery characteristics of waxy crude oil gel structures
Available online 25 January 2026
The primary method for transporting high-wax crude oil is heated pipeline transmission. During shutdowns, the gelled state and structural strength of the congealed oil directly determine the restart...
Efficient P/S and up/down wavefield decomposition in vertical transversely isotropic media and its application in elastic reverse time migration
Available online 25 January 2026
Common artifacts existing in anisotropic elastic reverse time migration (ERTM) image are mainly cross-talk artifacts, false images and low-frequency noise. To address these problems, we propose a new...
Effects of Lamina on petrophysical properties and brittleness of shales: Insight from lamina-scale experiment and fracture propagation simulation
Available online 25 January 2026
Accurate shale characterization is hampered by the lack of high-resolution analytical techniques to probe the in situ petrophysical and mechanical properties at the lamina scale. Here we report for...
Fracture propagation mechanisms of cross-layer fracturing with directional perforation in off-target horizontal wells
Available online 25 January 2026
Multi-stage fracturing with horizontal wells is a pivotal technique for developing the unconventional reservoirs. Owing to complex geological conditions coupled with inherent limitations in existing...
A quantitative interpretation method of gas kick driven by physics-informed neural network
Available online 25 January 2026
To address the challenges associated with predicting wellbore fluid flow behavior and gas kick rates in deep, complex formations following gas kick events, this study develops a quantitative interpretation...
Coordinate-transformation-based fast sweeping method for the factored eikonal equation on triangular meshes
Available online 23 January 2026
Accurate traveltime computation in complex geometries is crucial for seismological applications such as traveltime tomography and migration. However, eikonal solvers relying on finite-differences encounter...
Effect of CO2 pre-injection on fracture propagation morphology in shale reservoirs under CO2 hybrid fracturing
Available online 23 January 2026
Supercritical CO2 fracturing, as a waterless fracturing technology, is attracting increasing attention in the shale oil reservoir development industry. In recent years, a novel CO2 hybrid fracturing...
The control of paleo-geomorphology on the depositional architecture of a Late Jurassic axial submarine fan, North Sea, UK
Available online 23 January 2026
The depositional architecture of submarine fans in rift basins is significantly controlled by complex geomorphology created by widespread normal faults, presenting a key challenge in deep-water sedimentology....
Climate forcing of variations in sedimentary environments and organic matter accumulation in the Qingshankou Formation, Songliao Basin (NE China): Evidence from organic petrology and geochemistry
Available online 23 January 2026
Lacustrine organic matter (OM) accumulation is a critical Earth’s carbon sink and a source of hydrocarbon resources. The Upper Cretaceous Qingshankou Formation in the Songliao Basin archives an organic-rich...
Mechanisms of microfracture impact on reservoir quality and gas saturation in tight sandstones
Available online 23 January 2026
Microfractures are believed to significantly influence gas storage and flow in tight sandstones, yet there is a continued need for quantitative methods to better understand their impact on reservoir...
Physics-informed neural network for reconstruction of seismic data under compressed sensing sampling
Available online 23 January 2026
Seismic exploration is one of the most critical methodologies and the highest-cost expenditures in the pre-exploration. The main cost of seismic exploration is acquiring seismic data, which can be significantly...
Coupled optimization framework of CO2-WAG injection for enhanced oil recovery and storage: Integrating MLP with evolutionary and metaheuristic algorithms
Available online 23 January 2026
This study introduces a machine-learning-driven workflow to optimize CO2-WAG by considering both oil production and CO2 sequestration as the output parameters. A compositional simulator is employed...
Kerogen aromatization and late hydrocarbon generation: Evidence from position-specific isotope composition of propane
Available online 22 January 2026
Natural gas accumulation involves complex multi-source mixing and post-genetic alterations that can lead to carbon isotopic reversals. Here, we report for the first time the co-occurrence of bulk and...
Planning and operation optimization for oilfield negative carbon integrated energy system considering source-load interaction
Available online 21 January 2026
Towards the carbon neutrality, the traditional fossil fuel-based energy supply in oilfield urgently needs to be replaced by the integrated energy systems (IES) based on zero carbon and negative carbon...
Residual magnetic fields from magnetic flux leaking detection accelerate microbiologically influenced corrosion of X80 pipeline steel induced by Desulfovibrio desulfuricans in sea mud environment
Available online 21 January 2026
Subsea pipelines buried in marine sediments are highly susceptible to microbiologically influenced corrosion (MIC). Although magnetic flux leakage (MFL) inspection is widely employed for pipeline integrity...
A new insight from morphological numerical simulation of casing shear-compression deformation caused by fault and fracture slip
Available online 21 January 2026
The casing shear-compression deformation (CS-CD) caused by well-intersecting small fault and large fracture (F-F) slip induced by hydraulic fracturing is considered to be the main casing deformation...
Multi-component composite steam flooding (MCCSF) expanding steam chamber and suppressing water invasion in edge-water heavy oil reservoirs: A comparative 3D experimental study
Available online 21 January 2026
The development of heavy oil reservoirs with edge-water presents significant challenges during pure steam flooding (PSF), including steam override, severe channeling, limited displacement/sweep efficiency,...
High-fidelity numerical simulation of ocean-bottom node 4C seismic data using the acoustic-elastic coupling equation
Available online 21 January 2026
The complex wavefields in ocean-bottom node (OBN) four-component (4C) seismic data, particularly interface waves like Scholte waves, pose significant challenges for processing and inversion. A key issue...
Wax deposition characteristics under oil-water two-phase stratified flow in pipeline
Available online 20 January 2026
Wax deposition in subsea pipelines transporting waxy crude oil under oil-water stratified flow remains a critical flow assurance challenge. This study systematically investigates wax deposition characteristics...
Adaptive weight strategy for frequency-decomposed seismic attribute fusion in predicting of complex sand body distributions
Available online 20 January 2026
High-precision sand prediction is fundamental to improving the efficiency of oil and gas exploration and development. To address the limitations of traditional fixed-weight fusion strategies, particularly...
Experimental study of the flow characteristics of surfactant-assisted aerosols in low permeability porous media
Available online 19 January 2026
Gas channeling in formations is a primary factor affecting the effectiveness of gas flooding and CO2 geo-storage. Current dominant methods for controlling gas channeling include water-alternating-gas...
Research and application of thin sandstone identification technique based on post-stack seismic data: A case study of Ecuador's M reservoir
Available online 18 January 2026
The M sandstone member within the Cretaceous Napo Formation is a critical hydrocarbon reservoir in the Oriente Basin's foredeep belt. However, its characterization is severely challenged by its thin-bed...
Lateral vibration and vibration control methods for ultra-deep well drill strings based on Cosserat geometrically exact beam theory
Available online 18 January 2026
In ultra-deep well operations, severe lateral vibration of drill string is a major factor in tool failure and decreased drilling efficiency. To investigate the vibration mechanisms and identify effective...
Performance of multifunctional viscous slickwater for enhanced oil recovery in tight oil reservoirs
Available online 17 January 2026
Economically recovering oil from tight/shale reservoirs requires extensively developed propped fracture networks and rock matrices with sufficient oil mobility, which imposes higher demands on the fracturing...
Effect of cashew nutshell liquid-modified EVAL on flow behavior and crystallization of waxy systems
Available online 17 January 2026
Light crude oils are being progressively depleted as the dominant primary energy source, leading to increased attention on the extraction and utilization of highly waxy crude oils. To address the poor...