A stacking ensemble approach for pore pressure prediction in real-time during drilling based on mud log data
Available online 17 September 2025
The precise and real-time prediction of pore pressure is critical for optimizing drilling efficiency and mitigating the potential risks associated with drilling operations. In order to surmount the...
Fracture response patterns in deep to ultra-deep tight sandstones: A comparison based on core and borehole Images
Available online 17 September 2025
Natural fractures serve as the primary storage spaces and flow pathways in deep to ultra-deep tight sandstone reservoirs, directly influencing hydrocarbon accumulation, preservation, and production....
Assessment of shale hydrocarbon evaporative loss during exposure: insights from online low-field nuclear magnetic resonance observations in the Qingshankou Formation, Songliao Basin, China
Available online 17 September 2025
Understanding the evaporative loss of shale oil is critical for the shale oil resources assessment. However, previous studies have largely neglected the rapid evaporative loss of shale oil that occurs...
Differential hydrocarbon enrichment in Ordovician strata controlled by intra-cratonic ultra-deep strike-slip fault movements, eastern Shunbei area, Tarim Basin, China: Constraints from in-situ calcite U-Pb dating and fluid inclusions
Available online 17 September 2025
Intracratonic strike-slip faults in central-western China's Tarim Basin serve as critical conduits for hydrocarbon migration and accumulation. This study integrates geochemical characterization, in-situ...
Adsorption behavior of spherical pores in shale integrated with simplified local density theory
Available online 16 September 2025
Shale is a strongly heterogeneous anisotropic porous medium with a complex nanopore structure. Therefore, accurately describing the distribution and occurrence of shale gas in the intricate pore structure...
Seismic simulation for distributed acoustic sensing data using a novel stress and strain-rate elastic wave equation
Available online 15 September 2025
Distributed acoustic sensing (DAS) is an advanced seismic acquisition technology with many advantages, such as low cost, wide frequency band, dense spatial sampling, and continuous recording. The straight...
Mobility evaluation of continental shale oil of the Permian Fengcheng Formation in the Mahu Sag:Reservoirs characteristics, multiple influencing factors and conceptual models
Available online 15 September 2025
Mobility is a crucial metric for assessing sweet spots of continental shale oil. However, due to the complexity of shale oil reservoirs characteristics and the lack of systematic analyses of factors...
Organic and inorganic pore networks in medium- to low-maturity shale: Insights from SEM analysis of Shahejie formation in the Dongying Sag
Available online 13 September 2025
The spatial distribution and structural characteristics of organic and inorganic pore networks are crucial for evaluating the storage capacity of medium- to low-maturity shale reservoirs. Based on scanning...
Insight into the impact of the Al distribution in ZSM-5 zeolite on deep hydrogenation of phenanthrene over Pt/HZSM-5
Available online 13 September 2025
Deep hydrogenation of polycyclic aromatic hydrocarbons (PAHs) into jet fuel is an important strategy for the upgrading of light cycle oil (LCO). Zeolite-supported metal catalysts have exhibited good...
Examining the mechanisms of rebound evolution of various pore types in Longmaxi Formation shale using shale triaxial creep experiments
Available online 13 September 2025
The Longmaxi Formation shale in the Sichuan Basin has been affected by late-stage tectonic uplift, leading to significant differences in the pore structures of reservoir formations across various structural...
Effects of different thermal insulated drill pipe deployment methods on wellbore temperature control in ultra-deep wells
Available online 12 September 2025
The exploitation of oil resources has now extended to ultra-deep formations, with depths even exceeding 10,000 m. During drilling operations, the bottomhole temperature (BHT) can surpass 240 °C. Under...
Impact of gas in different occurrence states on P-wave amplitude in coal
Available online 10 September 2025
Coalbed methane (CBM) resources have enormous potential in energy exploration and development, and evaluating the gas content in CBM is crucial for resource assessment and development. As the P-wave...
Research on the genesis mechanism of shale fractures
Available online 10 September 2025
Shale fractures, serving as conduits for the flow and storage space of shale oil, play a critical role in resource exploration and evaluation. Shale oil is considered a highly promising unconventional...
Multiscale anisotropic mechanical properties of oil shale: new insights from nanoindentation profiling
Available online 10 September 2025
Oil shale reservoirs are characterized by significant heterogeneity in mineral components and pronounced anisotropy in micromechanical properties - both influencing resource recovery. We couple fine-scale...
Joint physics and model-guided pre-stack seismic inversion using double dual neural network
Available online 10 September 2025
Pre-stack seismic inversion is used to calculate elastic parameters, including P-wave and S-wave velocities, as well as densities. These parameters play an integral role in the characterization of reservoirs,...
ThinGPT: describing sedimentary rock thin section images with a multimodal large language model
Available online 10 September 2025
Rock thin section description is an essential method for examining lithology, structure, diagenesis, and sedimentary environment, playing a pivotal role in fields such as geology, geophysics, and petroleum...
Research progress and scientific challenges in permeability evolution of hydrate bearing sediments
Available online 10 September 2025
Natural gas hydrate production involves complex mass/heat transfer, phase transformation, and multiphase seepage processes, where permeability critically influences exploitation efficiency and sediment...
The control of astronomical cycles on lacustrine mixed sedimentation and hydrocarbon occurrence: A case study of the Paleogene Shahejie Formation in the Dongying Sag, Bohai Bay Basin
Available online 9 September 2025
Gravity flows in steep-slope zones of lacustrine rift basins interact with deep-water shales to form heterogeneous mixed sedimentation zones, yet their sedimentary evolution and hydrocarbon occurrence...
Insight into porosity of shale oil reservoirs: Comparison of helium, low−temperature nitrogen adsorption−desorption, and nuclear magnetic resonance methods
Available online 6 September 2025
Porosity is a fundamental parameter in characterizing the pore structure of shale oil reservoirs, as it directly affects the accuracy of shale oil reserve estimations. Despite the availability of various...
Shale oil occurrence state and its controlling factors in saline lacustrine basins: Insights from sequential solvent extraction
Available online 6 September 2025
Due to the complexity of the lithofacies associated with shale oil in saline lacustrine basins, the differences of shale oil occurrence state and its controlling factors in different lithofacies are...
FDEM modeling of the fracture propagation behaviors under the joint interaction of shale anisotropy and multi-lithologic stack
Available online 4 September 2025
Exploring the interaction between hydraulic fractures and complex geological conditions is critical for multilayered commingling production in the laminated continental shale oil reservoirs. In this...
Shale pore modification induced by syncline bending in the Eastern Fold Belt of Sichuan Basin, South China
Available online 4 September 2025
Shale deformation is crucial in various geological processes. To investigate the effect of deformation on pore characteristics for highly compacted shale, the macro tectonic strain and micro pore structure...
Risk-based design method for gas storage wellbore structure using grey geological information
Available online 2 September 2025
Underground gas storage facilities play a crucial strategic role in ensuring the balance of natural gas supply and demand, addressing seasonal fluctuations, and responding to emergencies. The design...
Intelligent identification method for dissolution vugs in karst reservoirs of carbonate rocks using electrical image logs: The Dengying Formation reservoir in the Gaoshiti-Moxi block, Sichuan Basin
Available online 1 September 2025
Accurately characterizing the storage space of fractured-vuggy carbonate reservoirs is a major technical challenge in the efficient exploration and development of the petroleum industry. Electrical...
Stepwise inversion method using second-order derivatives of elastic impedance for fracture detection in orthorhombic medium
August 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...
