The geochemical, pore development and water-bearing characteristics of deep and ultra-deep marine shales and their effects on gas content: New implications from the shales of the first Lower Cambrian high-yield gas well (Z201) in China
Available online 19 February 2025
The Lower Cambrian shales in the Sichuan Basin are considered one of the most promising shale gas resources in China. However, large-scale commercial development has not been achieved due to the relatively...
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Investigating petrophysical properties of gas hydrate-bearing sediments using digital rock technology: A microscopic perspective
Available online 19 February 2025
Natural gas hydrates are crystalline solid complexes with different morphologies found in marine sediments and permafrost zones. The petrophysical properties of gas hydrate-bearing sediments (GHBS)...
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Effective pure qP-wave equation and its numerical implementation in the time-space domain for 3D complicated anisotropic media
Available online 18 February 2025
Seismic anisotropy has been extensively acknowledged as a crucial element that influences the wave propagation characteristic during wavefield simulation, inversion and imaging. Transversely isotropy...
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Spectral graph convolution networks for microbialite lithology identification based on conventional well logs
Available online 17 February 2025
Machine learning algorithms are widely used to interpret well logging data. To enhance the algorithms’ robustness, shuffling the well logging data is an unavoidable feature engineering before training...
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Rock breakage and temperature rising of rock cutting after high-temperature treatment
Available online 14 February 2025
Geothermal energy is a clean and ecologically friendly energy source with significant potential. The temperature variations between the Polycrystalline Diamond Cutter (PDC) cutter and the rock of the...
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Deep learning-based upscaling for CO2 injection into saline aquifers
Available online 14 February 2025
Numerical simulation is an essential technique for CO2 geological storage operations. However, high-resolution geological models typically consist of a large number of grid blocks, making numerical...
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Quantitative insight into fracture distribution during supercritical CO2 fracturing on tight sandstone formation
Available online 14 February 2025
Supercritical CO2 (SC-CO2) fracturing stands out a promising waterless stimulation technique in unconventional resources development. While numerous studies have delved into the induced-fracture mechanism...
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Multidisciplinary insights into the origin of natural gas from hydrocarbon generation and charging history of Permian dolomite reservoir in Sichuan Basin
Available online 14 February 2025
Understanding the origin of natural gas in deep and ultra-deep reservoirs with multiple potential source rocks remains challenging due to the complex thermal evolution of hydrocarbons at high temperatures...
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Exact P-wave reflection and transmission coefficients for horizontal transversely isotropic media at an imperfectly welded contact interface under in-situ horizontal stress
Available online 13 February 2025
A comprehensive understanding of exact seismic P-wave reflection and transmission (R/T) coefficients at imperfectly welded or non-welded contact interfaces holds paramount importance in the realm of...
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Geological parameters and gas mixture composition on enhanced coalbed methane recovery: A THM modeling approach
Available online 13 February 2025
The utilization of coalbed methane (CBM) cannot only alleviate the energy crisis, but also reduce greenhouse gas emissions. Gas injection is an effective method to enhance CBM recovery. Compared to...
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Intermediate-high frequency dielectric permittivity of oil-wet rock and its wettability characterization
Available online 8 February 2025
Wettability has complex effects on the physical properties of reservoir rocks. The wettability of rocks should be characterized accurately to explore and develop oil and gas. Researchers have studied...
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New alkylbenzene parameters to identify organic matter sources for source rocks of light oils and condensates from the Tarim Basin and Beibuwan Basin
January 2025
As an important component of light hydrocarbon compounds, alkylbenzene compounds lack indicators to indicate the source of organic matter of light oils and condensates. Forty-one oil samples from the...
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Study of a new structural emulsion and its application in drilling fluids
January 2025
Aiming at the leakage problem in the compact sandstone drilling of the Keziluoyi Formation in Southwest Tarim, Nano-core-emulsion was prepared by coating modified nano-SiO2 with nano-emulsion, its particle...
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Impact of temperature and salinity on fines detachment: AFM measurements and XDLVO theory
January 2025
Fine particle detachment and subsequent migration can lead to severe pore plugging and consequent permeability decline. Therefore, it is crucial to quantify the critical condition when fine particle...
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Evolution and generation mechanism of retained oil in lacustrine shales: A combined ReaxFF-MD and pyrolysis simulation perspective
January 2025
To accurately investigate the evolution characteristics and generation mechanism of retained oil, the study analyzed organic-rich lacustrine shale samples from the Paleogene Kongdian Formation in Cangdong...
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Evaluation of micro-dispersion on oil recovery during low-salinity water-alternating-CO2 processes in sandstone cores: An integrated experimental approach
January 2025
Low-salinity water (LSW) and CO2 could be combined to perform better in a hydrocarbon reservoir due to their synergistic advantages for enhanced oil recovery (EOR); however, its microscopic recovery...
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Applications of molecular dynamics simulation in studying shale oil reservoirs at the nanoscale: Advances, challenges and perspectives
January 2025
The global energy demand is increasing rapidly, and it is imperative to develop shale hydrocarbon resources vigorously. The prerequisite for enhancing the exploitation efficiency of shale reservoirs...
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Sub-lacustrine debrite system: Facies architecture and sediment distribution pattern
January 2025
The deep-water systems in different types of sedimentary basins exhibit significant variability. Current knowledge of deep-water deposition is mainly derived from deep-marine turbidite systems. However,...
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Detailed oil-source correlation within the sequence and sedimentary framework in the Fushan Depression, Beibuwan Basin, South China Sea
January 2025
The Fushan Depression is one of the petroliferous depressions in the Beibuwan Basin, South China Sea. Previous studies have preliminarily explored the origin and source of crude oils in some areas of...
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Preparation of EVAM-g-NSiO2 nanocomposite pour point depressant and its effect on rheological properties of model waxy oil
January 2025
Modified ethylene-vinyl acetate copolymer (EVAM) and amino-functionalized nano-silica (NSiO2) particles were employed as the base materials for the synthesis of the nanocomposite pour point depressant...
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Machine learning-based grayscale analyses for lithofacies identification of the Shahejie formation, Bohai Bay Basin, China
January 2025
It is of great significance to accurately and rapidly identify shale lithofacies in relation to the evaluation and prediction of sweet spots for shale oil and gas reservoirs. To address the problem...
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A novel self-rotating down-the-hole hammer with impact and rotary functions for directional drilling: Design, modeling, and experiments
January 2025
Pneumatic down-the-hole hammer, serving as rock-breaking tool, possesses appeal for directional drilling due to its high rate of penetration. However, corresponding experimental studies on existing...
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Exceptional functionalized dual-acidic ionic liquid: High-efficiency catalytic reaction medium for oxidation desulfurization
January 2025
The development of highly active functionalized ionic liquids (ILs) as both extractants and catalysts for use in achieving deep desulfurization continues to pose challenges. In this study, a highly...
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Mesoporous SiO2 nanoparticles with low surface energy and multi-level roughness as shale wellbore stabilizers in oil-based drilling fluid
January 2025
Oil-based drilling fluids possess excellent properties such as shale inhibition, cuttings suspension, and superior lubrication, making them essential in the development of unconventional oil and gas...
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Integrating well logs, 3D seismic, and earthquake data for comprehensive prediction of 3D in-situ stress orientations: A case study from the Weiyuan area in the Sichuan Basin, China
January 2025
Determining the orientation of in-situ stresses is crucial for various geoscience and engineering applications. Conventional methods for estimating these stress orientations often depend on focal mechanism...
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