Experimental investigation of surfactants and their ethanol blends for CO2–oil miscibility enhancement in CO2-EOR
Available online 11 July 2025
As one promising CO2 capture utilization and storage (CCUS) technology, miscible CO2-enhanced oil recovery (CO2-EOR) significantly outperforms immiscible flooding in enhancing oil production and storing...
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High-pressure driven lubricant infiltrated porous diamond for the preparation of self-lubricating diamond tools
Available online 10 July 2025
With the global oil and gas industry increasingly targeting ultra-deep well development, the demand for wear resistance in polycrystalline diamond compact (PDC) bits is increasing. However, further...
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An unsupervised intelligent warning model for drilling kick risk based on multi-temporal feature coupling
Available online 9 July 2025
As oil and gas exploration continues to progress into deeper and unconventional reservoirs, the likelihood of kick risk increases, making kick warning a critical factor in ensuring drilling safety and...
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Preparation and performance of high temperature resistant and high strength self-healing lost circulation material in drilling industry
Available online 9 July 2025
Lost circulation of drilling fluid is an international engineering problem during drilling. Aiming at the problems of the first-time lost circulation control success rate and poor adaptability of traditional...
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Lignin in oilfield application: Current trends and future perspectives
Available online 9 July 2025
With the depletion of shallow and mid-depth oil and gas resources, exploration and development have increasingly shifted toward deep and ultra-deep reservoirs. However, high bottom-hole temperatures...
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Real-time NMR investigation of water infiltration mechanisms and pore structure evolution in fractured sandstone near-wellbore regions
Available online 7 July 2025
During the exploitation of sandstone gas reservoirs, natural fractures near the wellbore affect water infiltration and pore evolution; however, the impact mechanisms of these fractures remain unclear....
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Can clay-rich reservoirs in predominantly-freshwater lacustrine shale systems serve as primary exploration targets in low-medium maturity? A case study of the Triassic Yanchang Formation of the Ordos Basin
Available online 7 July 2025
Whether clay-rich shale reservoirs with low-medium maturity can serve as primary exploration targets remains a focal point of debate in the academic community. Clarifying the exploration potential of...
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Occurrence state of lacustrine shale oil in the second member of the Paleogene Kongdian Formation, Cangdong Sag, Bohai Bay Basin
Available online 7 July 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...
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A modeling-inversion methodology for source rocks based on clay-kerogen lamination and pore geometry
Available online 5 July 2025
Source rocks (shales) exhibit different geometric pore types and considerable anisotropy caused by the preferential orientation of the clay and kerogen layers, which is not accounted for in classical...
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Physic-guided multi-azimuth multi-type seismic attributes fusion for multiscale fault characterization
Available online 5 July 2025
Accurate characterization of the fault system is crucial for the exploration and development of fractured reservoirs. The fault characterization technique based on multi-azimuth and multi-attribute...
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Near-wellbore 3D velocity imaging inversion method based on array acoustic logging data
Available online 4 July 2025
The characterization of subsurface formations via the analysis of near-wellbore velocity profiles represents a crucial method in geophysical exploration. This technique enables the evaluation of key...
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Influence of electric and flow field characteristics on the cleaning of fillers for FCCS electrostatic separation
Available online 3 July 2025
Filler cleaning is a challenge that affects the efficient separation of FCCS particles by electrostatic methods and limits the utilization of the oil slurry. Two filler cleaning methods are proposed...
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Microscopic accumulation mechanism of helium in shale gas: Insights from molecular simulation
Available online 3 July 2025
Shale gas in southern China is found to contain economically valuable helium (He), which is inconsistent with conventional perspective that hydrocarbon gases in shale would dilute He to sub-economic...
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Finite-difference simulation of elastic waves in fluid-solid coupled media with irregular interface
Available online 2 July 2025
The finite-difference method (FDM) is an essential tool in exploration geophysics, particularly for simulating wave propagation in fluid-solid coupled media. Despite its widespread use, FDM faces significant...
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The influence mechanism of liquid sedimentary layers in urban underground spaces on the characteristics of natural gas explosions and damage risk
June 2025
Gas explosions are a frequent hazard in underground confined spaces in the process of urban development. Liquid sedimentary layers, commonly present in these environments, have not been sufficiently...
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Evaluation of CO2 storage in fractured coal seam and the effect of coal fines
June 2025
Gas channeling in fractures during CO2 injection into the deep coal seam seriously reduces the CO2 storage efficiency after the development of coalbed methane. The generation and migration of coal fines...
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Research on small molecule wetting agent for drilling fluids applied in Antarctic drilling engineering
June 2025
Antarctica contains numerous scientific mysteries, and the Antarctic ice sheet and its underlying bedrock contain important information about the geological structure of Antarctica and the evolutionary...
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Thin layer identification using a theoretical X-ray logging while drilling (LWD) density imaging tool
June 2025
With the increasing demand for oil exploration and subsurface resource development, density imaging plays an increasingly important role in identifying thin layers. However, conventional density imaging...
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Evolution of the 3D pore structure of organic-rich shale with temperature based on micro-nano CT
June 2025
Organic-rich shale is a significant potential source of oil and gas that requires development through in situ conversion technology. However, the evolution patterns of the internal three-dimensional...
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In-situ temperature-pressure preserved coring for onshore deep oil and gas exploration: research on the design principles and mechanical properties of the temperature-preserved core chamber
June 2025
A novel temperature-preserved core chamber designed for depths exceeding 5000 m has been developed to enhance the scientific understanding of deep oil and gas reservoirs. This temperature-preserved...
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A dual-model dual-grid upscaling method for solid-based thermal-reactive-compositional flow simulations in fractured oil shale reservoirs
June 2025
Simulation of thermal-reactive-compositional flow processes is fundamental to the thermal recovery of ultra-heavy hydrocarbon resources, and a typical oilfield practice is the in-situ conversion process...
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Genesis and quantitative evaluation of deep petroleum phase diversity in the Tazhong area, Tarim Basin
June 2025
The reservoired petroleum fluids in the deep Ordovician carbonates in the Tazhong area, Tarim Basin, exhibit diverse and intricate geochemical properties and petroleum phases. However, the study on...
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Molecular simulation of the solubility of hydrocarbon oligomers in supercritical CO2 for direct viscosification
June 2025
Direct viscosification of CO2 offers promising alternative for mobility control and reduction in residual brine saturation, thus to improve the CO2 trapping in saline aquifers. Hydrocarbon oligomers,...
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The fractal characteristics of the pore throat structure of tight sandstone and its influence on oil content: A case study of the Chang 7 Member of the Ordos Basin, China
June 2025
Tight oil is the most viable target for unconventional oil and gas exploration, but the complexity of micro-/nanopore throat systems significantly affects the oil content of reservoirs. To investigate...
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Porosity prediction based on improved structural modeling deep learning method guided by petrophysical information
June 2025
Porosity is an important attribute for evaluating the petrophysical properties of reservoirs, and has guiding significance for the exploration and development of oil and gas. The seismic inversion is...
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