Dynamic evolution of shale oil occurrence in lacustrine shales: Lithological constraints and implications for in-situ conversion
Available online 4 June 2026
The occurrence state of shale oil is crucial for its mobility and development, which is closely linked to petroleum generation and pore system evolution; however, the dynamic coupling between them across...
Staged propagation mechanisms and their implications for fracture interaction and fracture swarm formation
Available online 3 June 2026
Hydraulic fracture swarms are widely observed in post-fracturing core samples, yet their formation mechanisms remain incompletely understood. In this study, we employ a visualized experimental system...
Identifying the magnesium source in hydrothermal dolostone reservoirs: A multi-proxy approach using δ26Mg, δ44/40Ca, and 87Sr/86Sr
Available online 3 June 2026
Dolostone, especially replacement dolostone, is a significant component of Earth's carbonate rock archive. Hydrothermal dolostones, often associated with fault zones, play a crucial role in the dolostone...
Polyacrylamide-assisted synthesis of highly dispersed Ni nanoparticles wrapped by SAPO-11 molecular sieves for enhanced alkane hydroisomerization performances
Available online 3 June 2026
A novel polyacrylamide-assisted method for synthesizing the hierarchical SAPO-11-wrapped Ni catalyst was proposed. In this method, firstly, Ni2+ ions from nickel salts were coordinated with nitrogen...
Seismic lithofacies classification and fault detection using self-organizing maps and convolutional neural networks in the Penobscot Field, Scotian Shelf, Eastern Canada
Available online 3 June 2026
Accurate characterization of lithofacies and fault networks is critical for delineating reservoir architecture, heterogeneity, and compartmentalization in structurally complex hydrocarbon systems. Conventional...
Quantifying the through-going evolution of strike-slip fault zones: Insights from analogue modelling
Available online 3 June 2026
Large strike-slip fault zones commonly develop through-going architectures through progressive linkage of fault segments. However, quantitatively characterizing the through-going evolution of strike-slip...
A nano-micro-continuum framework for liquid flow in multicomponent porous media: Impact of microporosity and microscale effects
Available online 2 June 2026
The multiscale features of shale, along with the inherent presence of microporosity due to current imaging limitations, pose significant challenges in accurately describing oil transport behavior. Microscale...
A resilience-oriented transient optimization approach for emergency operation of natural gas pipeline systems with linepack dynamics and priority-based load shedding
Available online 2 June 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...
Depositional environmental evolution and reservoir controlling effects of the P2x Formation in the Mahu Sag: Insights from the PCA-HCA coupled analysis
Available online 2 June 2026
The conglomerates of the Xiazijie (P2x) Formation in the Mahu Sag are dominated by dissolution pores of zeolite cement as the primary hydrocarbon reservoir spaces. Consequently, the storage characteristics...
Geological fault identification via multi-knowledge causally embedding graph representation applied in underground gas storage
Available online 1 June 2026
Geological fault identification is critical for gas storage safety, yet remains reliant on manual interpretation with inherent inefficiencies. While Artificial intelligent (AI) methods offer alternatives,...
Influence factors of long-term stability of silica-enriched Portland cement under ultrahigh temperatures
Available online 1 June 2026
Downhole high-temperature and high-pressure (HTHP) conditions can cause significant deteriorations of well cement, posing a major risk to wellbore integrity. A comprehensive experimental program is...
Microscopic forces between methane hydrate particle and droplet-wetted sand grain surface in a high-pressure system: Experiments and mechanisms
May 2026
Solving the issue of hydrate formation and blockage in pipelines during deepwater oil and gas development and hydrate-based green energy extraction is a crucial flow assurance safety concern. The micro-forces...
Reutilization of regenerated exhaust gas from the centrifugation-filtration coupled purification system: a closed-loop process
May 2026
The regenerated exhaust gas was reutilized to configure a centrifugation-filtration coupled purification system (CFCPS), aiming to achieve a closed-loop gas purification process. It can be foreseen...
Oxidative cracking performance of low maturity shales at different O2 concentrations
May 2026
Conventional in-situ conversion technologies including electrical heating or injection of hot fluid face development challenges. Low heat transfer efficiency and limited pore expansion restrict its...
Potential application of hydrophobically modified Welan gum as a novel thermo-salt tolerant EOR agent in high-temperature and high-salinity reservoirs
May 2026
Conventional polymeric systems face significant challenges in maintaining performance under high-temperature, high-salinity reservoir conditions due to limited thermal and saline stability. To address...
Effect of CO2 pre-injection on fracture propagation morphology in shale reservoirs under CO2 hybrid fracturing
May 2026
Supercritical CO2 fracturing, as a waterless fracturing technology, is attracting increasing attention in the shale oil reservoir development industry. In recent years, a novel CO2 hybrid fracturing...
Source and thermochemical sulfate reduction of natural gases in the Ordovician carbonate–evaporite assemblage in the Ordos Basin, China
May 2026
Thermochemical sulfate reduction (TSR) commonly occurs in carbonate–evaporite assemblages, making the identification of gas sources difficult. Given that the sources of natural gases in the Ordovician...
A new approach for analyzing the formation and evolution of the Mesoproterozoic petroleum system in the Ordos Basin, China: Insights from a nested simulation with local grid refinement
May 2026
The study on Meso–Neoproterozoic petroleum systems has attracted extensive attention. However, it still faces some problems such as the availability of hydrocarbon accumulating elements, complexity...
A model for shale gas flow and permeability leveraging coupled transport mechanisms
May 2026
The extraction of shale gas is challenged by complex flow mechanisms and significant microscale effects within nanoscale pores. Existing models often overlook key flow mechanisms such as end effects,...
Microscopic experiments and simulations of CO2 huff-n-puff displacement mechanism considering heterogeneity and fractures
May 2026
Heterogeneity and fractures significantly influence oil and gas migration. However, current research remains insufficient in clearly visualizing CO2 displacement mechanisms under such reservoir conditions....
Techno-economic co-optimization of CO2 enhanced oil recovery strategies in a tight oil reservoir using coupled improved evolutionary algorithm and machine learning framework
May 2026
Massive carbon dioxide (CO2) emissions drive climate change. Injecting CO2 into unconventional reservoirs achieves both enhanced oil recovery (EOR) and geological sequestration. However, simultaneously...
Semi-supervised learning for AVO inversion with bidirectional spatial feature constraints
May 2026
Prestack amplitude variation with offset (AVO) inversion using one-dimensional convolutional neural networks often lacks lateral continuity. While two-dimensional methods improve this, they are limited...
Coordinate-transformation-based fast sweeping method for the factored eikonal equation on triangular meshes
May 2026
Accurate traveltime computation in complex geometries is crucial for seismological applications such as traveltime tomography and migration. However, eikonal solvers relying on finite-differences encounter...
Wax deposition characteristics under oil-water two-phase stratified flow in pipeline
May 2026
Wax deposition in subsea pipelines transporting waxy crude oil under oil-water stratified flow remains a critical flow assurance challenge. This study systematically investigates wax deposition characteristics...
Gas-solid two-phase flow erosion of needle throttle valve in shale gas field based on CFD-DEM model
May 2026
Needle throttle valve (NTV) is a key equipment to ensure the safe production of shale gas fields, but it is often seriously eroded by the solid particles in the produced gas. At this work, the CFD-DEM...
