Plugging mode of flaky lost circulation materials within fractures and mechanism to enhance pressure-bearing capacity for the plugging zone
August 2025
During drilling operations in deep fractured tight gas reservoirs, lost circulation of working fluid frequently occurs due to the formationʼs low pressure-bearing capacity. Adding lost circulation materials...
TOC
August 2025
Enhanced recovery in heavy oil reservoirs with interlayers using flue gas-assisted VH-SAGD: A 2D visualization study
August 2025
The potential of the vertical-horizontal well hybrid SAGD technique for developing shallow heavy oil reservoirs is gradually being realized. However, challenges remain in terms of low thermal efficiency...
Analysis of seismic dispersion and attenuation for gas-hydrate formations in the South China Sea
August 2025
Existing studies indicate that gas hydrate-bearing formations exhibit notable seismic velocity dispersion and attenuation. The Shenhu area of the South China Sea hold significant gas hydrate resource...
Fast simulation of EM telemetry in vertical drilling: A semi-analytical finite-element method with virtual layering technique
August 2025
The electromagnetic (EM) telemetry systems, employed for real-time data transmission from the borehole and the earth surface during drilling, are widely used in measurement-while-drilling (MWD) and...
Study on S-wave velocity prediction in shale reservoirs based on explainable 2D-CNN under physical constraints
August 2025
The shear wave (S-wave) velocity is a critical rock elastic parameter in shale reservoirs, especially for evaluating shale fracability. To effectively supplement S-wave velocity under the condition...
A large-scale, high-quality dataset for lithology identification: Construction and applications
August 2025
Lithology identification is a critical aspect of geoenergy exploration, including geothermal energy development, gas hydrate extraction, and gas storage. In recent years, artificial intelligence techniques...
Deep learning-assisted optimization for enhanced oil recovery and CO2 sequestration considering gas channeling constraints
August 2025
Carbon dioxide Enhanced Oil Recovery (CO2-EOR) technology guarantees substantial underground CO2 sequestration while simultaneously boosting the production capacity of subsurface hydrocarbons (oil and...
The analysis of drill string dynamics for extra-deep wells based on successive over-relaxation node iteration method
August 2025
The complex vibration directly affects the dynamic safety of drill string in ultra-deep wells and extra-deep wells. It is important to understand the dynamic characteristics of drill string to ensure...
Full waveform inversion with fractional anisotropic total p-variation regularization
August 2025
Full waveform inversion is a precise method for parameter inversion, harnessing the complete wavefield information of seismic waves. It holds the potential to intricately characterize the detailed features...
Occurrence state of lacustrine shale oil in the second member of the Paleogene Kongdian Formation, Cangdong Sag, Bohai Bay Basin
August 2025
Understanding the occurrence state of shale oil is crucial for the effective development of shale oil resources. Although the second member of the Kongdian Formation (Ek2) is a key interval for lacustrine...
A new model for determining the effective permeability of tight reservoirs based on Fractal-Monte Carlo method
August 2025
In contrast to conventional reservoirs, tight formations have more complex pore structures and significant boundary layer effect, making it difficult to determine the effective permeability. To address...
The occurrence, origin, and enrichment of helium in the Wufeng-Longmaxi shale gas in the Sichuan Basin, China
August 2025
Helium is a valuable natural resource used widely in high-tech industries because of its unique physical and chemical properties. The study of helium in shale gas is still in its infancy, and the content,...
Logging evaluation of acoustic anisotropy and its relationship with “sweet spots” in lacustrine shale oil reservoirs: The Fengcheng Formation of the Mahu Sag, China
August 2025
China's lacustrine shale oil reserves are abundant, making it a key area for future exploration and development. Most lacustrine shales feature a mix of mineral compositions and interlayer sedimentary...
Research on the in-situ catalytic pyrolysis of heavy oil by 2D layered MOF and its catalytic mechanism
August 2025
China possesses abundant heavy oil resources, yet faces challenges such as high viscosity, underdeveloped production technologies, and elevated development cost. Although the in-situ catalytic viscosity-reduction...
Natural fractures and their effectiveness in deep tight sandstone reservoirs of foreland thrust belts in the southern Junggar Basin, China
August 2025
Strong tectonic activities and diagenetic evolution encourage the development of natural fractures as typical features in deep tight sandstone reservoirs of foreland thrust belts. This study focused...
Identification and distribution patterns of the ultra-deep small-scale strike-slip faults based on convolutional neural network in Tarim Basin, NW China
August 2025
The isolated fracture-vug systems controlled by small-scale strike-slip faults within ultra-deep carbonate rocks of the Tarim Basin exhibit significant exploration potential. The study employs a novel...
Pore-scale gas–water two-phase flow and relative permeability characteristics of disassociated hydrate reservoir
August 2025
Clayey-silt natural gas hydrate reservoirs in the South China Sea exhibit loose and unconsolidated structures, heterogeneous pore structures, high clay mineral contents, and strong hydrophilicity. These...
Pressure transient behavior of fractured wells in multilayered tight gas reservoirs with heterogeneous properties and limited fracture height
August 2025
Hydraulic fracturing and commingle production of multiple layers are extensively adopted in unconventional tight gas reservoirs. Accurate determination of parameters of individual layers in multilayered...
Deformation and failure evolution mechanism of inherently anisotropic sedimentary rocks under true-triaxial stress
Available online 29 August 2025
Understanding the mechanical behavior and failure characteristics of anisotropic sedimentary rocks under true-triaxial in-situ stress conditions is critical in understanding and mitigating damaging...
Thermal evolution of the Paleozoic in the eastern Sichuan Basin: Insights from thermochronometric analyses and basin modeling
Available online 27 August 2025
Eastern Sichuan Basin is a critical region for oil and gas production in China, and the thermal effect of the Emeishan Mantle Plume (EMP) on the basin remains unclear, which limits the study of the...
Real-time NMR experimental study of displacement–imbibition coupling in tight/shale oil reservoirs: Lithological variations, influencing factors, and key insights
Available online 27 August 2025
Displacement–imbibition coupling production is a pivotal technology for enhancing oil recovery (EOR) in waterflooded tight/shale oil reservoirs. However, the microscopic fluid transport mechanisms across...
LLMs-guided parameters prediction of tight sandstone reservoirs
Available online 25 August 2025
Accurate prediction of reservoir parameters is essential for reservoir evaluation. Recent machine learning methods have spurred significant advancements in reservoir prediction; however, limited well...
Imbibition mechanism analysis of modified black nanosheet and low salinity water composite system for enhanced oil recovery by NMR method
Available online 22 August 2025
Black nanosheets (BN, with a specific chemical composition of molybdenum disulfide) have been widely studied for low-permeability reservoir development due to their unique nanoscale dimensions and lamellar...
A dynamic unified well-killing model for synergistic regulation of multiple well-killing methods
Available online 22 August 2025
Ultra-deep and complex formations are characterized by narrow safety density windows and challenging well control. The combined use of multiple well-killing methods or temporary adjustments to well-killing...
