The occurrence, origin, and enrichment of helium in the Wufeng-Longmaxi shale gas in the Sichuan Basin, China
Available online 18 May 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,...
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Bayesian AVO inversion of fluid and anisotropy parameters in VTI media using IADR-Gibbs algorithm
Available online 16 May 2025
Fluid identification and anisotropic parameters characterization are crucial for shale reservoir exploration and development. However, the anisotropic reflection coefficient equation, based on the transverse...
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Analysis of seismic dispersion and attenuation for gas-hydrate formations in the South China Sea
Available online 15 May 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...
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Molecular simulation of the solubility of hydrocarbon oligomers in supercritical CO2 for direct viscosification
Available online 15 May 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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Evaluation of dynamic inter-well connectivity by using the state-variable-capacitance model
Available online 14 May 2025
During oilfield development, a comprehensive model for assessing inter-well connectivity and connected volume within reservoirs is crucial. Traditional capacitance (TC) models, widely used in inter-well...
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Comparison of original and de-asphalted crude oils during formation of HCl-induced emulsion and sludge
Available online 13 May 2025
Stable HCl-crude oil emulsion and its subsequent sludge formation, with detrimental impacts on oil production, may stem from acid stimulation. One major ambiguity in this process is to discern the most...
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Enhanced recovery in heavy oil reservoirs with interlayers using flue gas-assisted VH-SAGD: A 2D visualization study
Available online 11 May 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...
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Inversion methods for elastic parameters and fracture parameters of monoclinic media induced by two groups of inclined fractures
Available online 10 May 2025
Fractures significantly impact oil and gas production by altering the mechanical properties of subsurface rocks. This study investigates the forward and inverse problems associated with monoclinic anisotropic...
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Full waveform inversion with fractional anisotropic total p-variation regularization
Available online 10 May 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...
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Catalyst deactivation model involving autocatalytic effect for the residue hydrotreating process
Available online 9 May 2025
Autocatalysis from the by-product metal sulfides plays a critical role in the residual oil hydrotreating (RHT) process. However, it has not been considered to build the catalyst deactivation models,...
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Pressure transient behavior of fractured wells in multilayered tight gas reservoirs with heterogeneous properties and limited fracture height
Available online 8 May 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...
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Origins of steam-mediated selectivity improvement in the oxidative coupling of methane over MnOx-Na2WO4/SiC
Available online 7 May 2025
Oxidative coupling of methane (OCM) is one of the most promising approaches to produce ethylene and ethane (C2-hydrocarbons) in the post-oil era. The MnOx-Na2WO4/SiO2 system shows promising OCM performance,...
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Stepwise inversion method using second-order derivatives of elastic impedance for fracture detection in orthorhombic medium
Available online 30 April 2025
Reservoirs with a group of vertical fractures in a vertical transversely isotropic (VTI) background are considered as orthorhombic (ORT) medium. However, fracture detection in ORT medium using seismic...
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Measurement while drilling of downhole engineering parameters by application of a newly designed micro-measurer
Available online 30 April 2025
As the well drilling depth has broken through the 10,000-meter in China, accurate measurements of downhole engineering parameters, such as annulus temperature and pressure for the whole wellbore, are...
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Pore-scale gas–water two-phase flow and relative permeability characteristics of disassociated hydrate reservoir
Available online 30 April 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...
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Biomass thermal decomposition induced hydrogen sulfide blooming in thermal recovery reservoirs
April 2025
High concentration of secondary hydrogen sulfide (sH2S) in thermal recovery reservoirs of Liaohe Oilfield, NE China was concluded to originate from thermochemical sulfate reduction (TSR), and no biotic...
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Diamondoids evolution in various phase states of ultra-deep hydrocarbons in Tarim Basin, NW China
April 2025
The conventional biomarkers are limited due to the extremely high thermal stresses in ultra-deep hydrocarbon reservoirs. The diamondoid with cage structure has excellent thermal stability and is an...
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TOC
April 2025
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Changes in shale microstructure and fluid flow under high temperature: Experimental analysis and fluid–structure interaction simulation
April 2025
Oil shale is characterized by a dense structure, low proportion of pores and fissures, and low permeability. Pore-fracture systems serve as crucial channels for shale oil migration, directly influencing...
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Exploring the synergistic effects and mechanistic insights of ionic and polyionic liquid combinations as shale inhibitors
April 2025
Ionic liquids (ILs), recognized for their negligible vapor pressure, thermal stability, and structural tailorability, offer targeted inhibition of clay expansion. Compared to ILs, polyionic liquids...
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OFC
April 2025
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Characteristics, controlling factors and mechanisms of natural fractures formation in lacustrine shale oil reservoirs: The Chang 7 member in Ordos Basin, China
April 2025
Lacustrine shale oil reservoirs of the Upper Triassic Chang 7 Member in the Ordos Basin have demonstrated significant potential for hydrocarbon resources. Natural fractures play a crucial role in hydrocarbon...
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Efficient deep-learning-based surrogate model for reservoir production optimization using transfer learning and multi-fidelity data
April 2025
In the realm of subsurface flow simulations, deep-learning-based surrogate models have emerged as a promising alternative to traditional simulation methods, especially in addressing complex optimization...
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Intermediate-high frequency dielectric permittivity of oil-wet rock and the wettability characterization
April 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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Exact P-wave reflection and transmission coefficients for horizontal transversely isotropic media at an imperfectly welded contact interface under in-situ horizontal stress
April 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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