A novel local maximum synchrosqueezing W transform for reservoir characterization
Available online 21 November 2025
Time-frequency analysis (TFA) serves as a critical tool in seismic signal processing and interpretation, particularly for characterizing non-stationary signals. However, conventional TFA methods, such...
Hydrate phase equilibria in oil-containing fluid: Experimental investigation and machine learning prediction based stacked ensemble
Available online 21 November 2025
During oil and gas development and transportation, the presence of oil and complex component in natural gas significantly impacts the hydrate phase equilibrium. However, the specific characteristics...
Seepage and blockage characteristics of methane hydrate-bearing porous media under different hydrate distribution conditions
Available online 21 November 2025
Blockage commonly occurs in and severally affects natural gas (mainly methane) reservoir exploitation, combustion ice (methane hydrate) exploitation and oil and gas pipeline transportation. The formation...
Geochemical heterogeneity of ultra-deep oil pyrolysis: Nanoscale infrared spectroscopy insights
Available online 21 November 2025
The heterogeneous cracking process of ultra-deep oil is well-studied, yet the geochemical evolution mechanisms of crude oil pyrolysis at the microscale remain unclear. This study conducts a closed-system...
Dynamic evolution of residual oil during long-term waterflooding in Middle East carbonate reservoirs: A pore-scale investigation
Available online 20 November 2025
Long-term water flooding (LTWF) is an efficient way to improve oil recovery (EOR) in carbonate reservoirs in the Middle East. Due to the complex depositional environment and intricate pore-throat structures...
Synergistic alginate chelation and semi-interpenetrating network for advanced wellbore stabilizing hydrogels
Available online 20 November 2025
In situ plugging hydrogels represent a promising strategy to combat wellbore instability in fractured formations. Despite their potential, they often fail due to unpredictable gelation kinetics and...
Pore scale phase behavior of condensate gas in porous media: Insights from 2D NMR T1–T2 spectrum method
Available online 20 November 2025
The widespread development of unconventional oil and gas reservoirs has advanced reservoir research to the nanoscale level. Under the influence of nanoscale confinement effects, the phase behavior of...
Comparing the thermal processing with slurry phase hydroupgrading to increase the yields of distillates of Arabian heavy crude oil
Available online 20 November 2025
With the increasing heavy and inferior quality of global oil resources, the efficient utilization of crude oil has become a critical challenge to be solved in the energy field. This work intends to...
Carbon isotopes of asphaltene-occluded hydrocarbons: A proxy for bitumen vein source identification in northwest Sichuan Basin, China
Available online 20 November 2025
The Lower Cambrian bitumen veins in northwestern Sichuan Basin originated from Precambrian paleo-oil reservoirs, yet the severe alterations of bitumen and high maturity of potential source rocks challenge...
Mechanical characteristic and damage mechanism of carbon/glass composites in offshore oil exploration
Available online 20 November 2025
Carbon/glass hybrid rods exhibit superior tensile strength, low weight, and exceptional corrosion resistance. However, rod splitting presents a considerable challenge to their practical applications,...
Simultaneous damage diagnosis of casing using interpretable multi-label classification
Available online 19 November 2025
Casing damage poses a significant challenge, severely compromising well integrity and production efficiency in oilfields. However, most existing studies typically focus on predicting only a single type...
Experimental study on imbibition depth and oil migration mechanism of a magnetic nanofluid for low-permeability reservoir oil recovery improvement
Available online 18 November 2025
Nanofluids are considered promising agents for enhanced oil recovery in low-permeability reservoirs, but their application is often restricted by poor thermal and saline resistance and high costs. Moreover,...
Double-crosslinked self-degradable hydrogel for temporary plugging in low temperature reservoirs
Available online 15 November 2025
Temporary plugging agents are critical to oilfield operations such as diversion fracturing, wellbore interventions, and drilling. This study develops a double-crosslinked self-degradable gel (DSDG)...
Study of the effect of nanoemulsion on the EOR in low-permeability, highly waxy oil reservoirs based on NMR displacement experiments
Available online 13 November 2025
Wax precipitation damage caused by cold water injection or temperature reduction is very commonly seen in the development of waxy crude oil reservoirs. Various methods for eliminating wax precipitation...
Charge-structure synergy in reservoir wettability reversal: Investigating with an integrated optical-multiscale framework
Available online 13 November 2025
Reservoir wettability modification is a key strategy for enhancing oil recovery (EOR), yet the mechanisms driving this reversal remain incompletely understood due to the scarcity of multiscale characterization...
A machine learning method for evaluating shale gas production based on the TCN-PgInformer model
Available online 13 November 2025
Since shale gas is a valuable energy resource, effective planning for its extraction and utilization depends on precise forecasting of gas well production. Conventional models need long computation...
Long-term sustained release of small molecular surfactants using microcapsules
Available online 13 November 2025
The controlled manipulation of surfactant concentration is essential for optimizing performance in numerous industrial applications, such as enhanced oil recovery in oil industry. However, encapsulating...
Joint geostatistical seismic inversion of elastic and petrophysical properties using stochastic cosimulation models based on parametric copulas
Available online 13 November 2025
Seismic properties play a fundamental role in the geological and petrophysical modeling of reservoirs due to their dependence on petrophysical properties. Most existing stochastic seismic inversion...
Development of an Innovative Permeability Model for Hydrate-Bearing Sediments under Creep Conditions: Effects of Particle Shape and non-uniform particle distribution
Available online 13 November 2025
Prolonged gas hydrate exploitation induces reservoir creep, leading to pore structure deformation, permeability reduction, and elevated risks of wellbore instability, ultimately impeding sustainable...
Oil-gas conditions of the Proterozoic metamorphic basement reservoirs in the Wensu Salient, Tarim Basin, China
Available online 12 November 2025
In 2017, Well XWD1 drilled in the Wensu Salient, northwest Tarim Basin achieved the first hydrocarbon discovery in Proterozoic metamorphic rocks within the western basin of China. However, uncertainties...
Unveiling the Role of Residual Structure in Hydrate Secondary Formation through Molecular Dynamics Simulations
Available online 12 November 2025
The rapid secondary formation of gas hydrate is a potential cause of flowline blockage in deepwater oil and gas production systems, posing serious flow assurance challenges. However, its microscopic...
Large-scale physical simulation of flow behavior in Kelasu ultra-deep fractured low-porosity sandstone gas reservoirs
Available online 12 November 2025
The ultra-deep fractured low-porosity sandstone gas reservoirs in the Kuqa Depression of the Tarim Basin exhibit complex characteristics, including high temperature, high pressure, significant in-situ...
Particle Dynamics and Wear Characteristics of Lining Layers in Curved Non-metallic Flexible Pipes for Deep-Sea Mining
Available online 12 November 2025
Wear of the internal lining in the non-metallic flexible pipes (NMFPs) is a critical issue in long-distance hydraulic lifting for deep-sea mining, as it can lead to structural failure and reduced service...
Swelling kinetics of polymer microspheres used for conformance control and their matching mechanisms with oil reservoir fractures
Available online 12 November 2025
Polymer microspheres are one type of particle gel with swelling property, and the particle size is distributed between nanometer and micron. Because of the good variability and migration characteristics,...
Illitisation impeded the thermal evolution of extractable organic matter: An interpretation of the mineralogy and thermal maturation of early Cambrian source rocks in Yunnan Province, China
Available online 12 November 2025
The degree of thermal alteration of organic matter in sediments is crucial for comprehending the progress of oil and gas generation. The thermal maturity of kerogen, which is a component of the organic...