Multivariate data-driven fracture identification and distribution pattern in tight sandstone reservoirs using an improved CNN-Attention-BiLSTM: A case study of the Permian Lower Shihezi Formation in the Hangjinqi area, Ordos Basin, China
July 2026
Natural fractures in tight sandstone reservoirs play an important role in hydrocarbon migration and accumulation. Fracture identification remains challenging due to the scarcity of labeled data and...
Pore pressure control on multi-scale reservoir properties in deep and ultra-deep sandstones of the Cretaceous Bashijiqike Formation, Kuqa Depression, Tarim Basin, NW China
July 2026
Understanding the effects of pore pressure on multiscale reservoir properties in deep and ultra-deep sandstones is important for many geological processes. This study integrated core analysis, computed...
Refinery optimization in OPEC member states: An integrated inverse DEA approach and economic viability analysis
July 2026
Refinery optimization is critical for ensuring energy security and economic resilience in Organization of the Petroleum Exporting Countries (OPEC) member states, where persistent inefficiencies and...
Hydrocarbon generation thermal simulation experiment of massive organic-rich tuff and laminar tuffaceous shale: A case study of the Chang 7 member of the Ordos Basin
July 2026
The Chang 7 Member of the Yanchang Formation in the Ordos Basin consists predominantly of airfall and water-borne tuff along with tuffaceous shale, which exhibit considerable hydrocarbon potential,...
A new insight from morphological numerical simulation of casing shear-compression deformation caused by fault and fracture slip
July 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...
A multiple review on identification and fine evaluation of shale pores: Prospects and challenges
July 2026
Accurate evaluation of pore systems in shale reservoirs is critical for understanding fluid flow, gas storage capacity, and overall reservoir performance. Extensive research has been conducted on the...
Coupled optimization framework of CO2-WAG injection for enhanced oil recovery and storage: Integrating MLP with evolutionary and metaheuristic algorithms
July 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...
Failure mechanism and structure optimization of sand control screen in water-bearing gas well
July 2026
The prospect of natural gas reservoir is broad. As the mining channel, the state of gas well determines the mining efficiency of the whole natural gas reservoir. After long-term mining of gas wells,...
Energy-driven damage constitutive model of thermal insulation materials for deep rock in-situ temperature-preserved coring
July 2026
Accurate evaluation of deep oil and gas reservoirs critically depends on key properties such as rock porosity and permeability, which are significantly affected by high-temperature conditions in deep...
Investigation of tip leakage vortex instability and pressure pulsation characteristics in a vane-type multiphase pump
July 2026
As a key efficient transportation equipment in oil-gas extraction, vane-type multiphase pumps face significant performance limitations due to extensive vortex formation in flow channels. This study...
Optimization of injection parameters in offshore low permeability reservoir based on a compositional embedded discrete fracture model
July 2026
Offshore development tends to aim for high production with fewer wells, which leads to large well spacing and wide range of low-pressure gradient. Compared with onshore, the low-velocity nonlinear flow,...
A resilience-oriented transient optimization approach for emergency operation of natural gas pipeline systems with linepack dynamics and priority-based load shedding
July 2026
Under extreme disturbances, the safety of natural gas pipeline networks is governed by transient capabilities to sustain fuel delivery rather than steady-state balance. Existing studies, often grounded...
Intelligent early kick recognition via knowledge-guided Bi-LSTM
July 2026
During oil and gas drilling, the accuracy of intelligent early kick recognition models relies on their detection of abnormal variation trends in monitoring parameters. These variation trends are contained...
Zwitterionic-hydrophobic associating polymer for enhanced rheology and fluid-loss control in high-temperature, high-salinity water-based drilling fluids
July 2026
In deep oil and gas drilling, high-temperature and high-salinity conditions have posed severe challenges to water-based drilling fluids. These harsh environments can impair the performance of drilling...
Thickening characteristics and conformance control mechanism of CO2-responsive fluid during CO2 flooding
July 2026
CO2-responsive fluid (CRF) is a surfactant solution characterized by low viscosity during the injection stage, and by a viscosity increase after reaction with CO2, which achieves mitigation of CO2 channeling....
Unveiling the multiscale dissolution pathways of asphaltene deposits in a natural deep eutectic solvent (NaDES)
July 2026
Heavy crude oil contains high levels of asphaltenes, which tend to aggregate and deposit in reservoir pores and pipelines, severely hindering recovery, transportation, and refining. To address the challenge...
A DBOKS-based hybrid machine learning method for carbonate rock classification
July 2026
Addressing the challenges in carbonate rock lithology identification, such as similar well-logging curve response characteristics, scarcity of transitional lithology samples leading to classification...
Molecular insights into the effects of representative organic molecules on spontaneous hydrate nucleation in oceanic sediments
July 2026
Knowledge of the effect of different organic molecules on spontaneous hydrate nucleation is crucial for understanding the formation of gas hydrates in marine reservoirs. Herein, microsecond MD simulations...
TOC
July 2026
OFC
July 2026
Petrophysical and mechanical evolution of tight conglomerate during energized pre-fracturing with distinct fluid systems
Available online 8 July 2026
Energized pre-fracturing fluids are widely applied in tight reservoirs to promote fracture complexity and improve hydrocarbon recovery. However, their coupled physicochemical interactions with tight...
Quaternary spatiotemporal evolution and multi-factor driving mechanisms of continental slope canyon–fan systems in Baiyun sag, Pearl River Mouth Basin, South China Sea
Available online 6 July 2026
As potential targets for deep-sea hydrocarbon exploration, continental slope canyon–fan systems preserve records of sea-level fluctuations and paleoclimatic changes. The Quaternary canyon–fan system...
Fluid inclusion analysis and Carbonate U–Pb dating reveal shale oil accumulation processes in the Qingshankou Formation, Songliao Basin, NE China
Available online 6 July 2026
Direct constraints on the absolute timing of shale oil accumulation and microscale migration within shale systems remain limited. Here we investigate ostracod limestone interbeds, calcite veins, and...
Pysics-informed coordinate-mapping categorizations for deciphering pore geometry and seepage capacity in oil shales
Available online 6 July 2026
In-situ thermal upgrading significantly alters pore structure in low-maturity oil shales, yet the key mechanisms controlling this transformation remain to be defined. Deciphering pore geometry and seepage...
