Petroleum Science最新文献

{"title":"Molecular dynamics study on the diffusion and dissolution of heavy oil in supercritical CO2 under high-temperature and high-pressure conditions","authors":"Ke-Xin Du,&nbsp;Song-Yan Li,&nbsp;Fa-Kun Li,&nbsp;Jia-Wei Zhao,&nbsp;Yu Zhang","doi":"10.1016/j.petsci.2026.03.056","DOIUrl":"10.1016/j.petsci.2026.03.056","url":null,"abstract":"<div><div>CO₂-assisted steam thermal recovery is an efficient CO₂-enhanced oil recovery (CO₂-EOR) technique, increases heavy oil production while storing CO₂. To elucidate heavy oil and supercritical CO₂ interactions under high-temperature and high-pressure conditions, PVT experiments were conducted, and molecular dynamics (MD) simulations were used to examine the effects of temperature and pressure on diffusion and dissolution in CO₂. The analysis considered oil and gas density distributions, interaction energies between SARA fractions and CO₂, radial distribution functions (RDFs), and diffusion coefficients obtained from mean square displacement (MSD). The results show that increasing temperature reduces the dissolved gas–oil ratio but enhances the volume coefficient. Light components such as saturates and aromatics interact most strongly with CO₂ and dissolve fastest, whereas heavy components such as resins and asphaltenes have lower interaction energies and dissolve more slowly because of strong π–π association. The interaction energy between CO₂ and light components is 2–4 times stronger than that with heavy components in the temperature range 373–523 K and pressure range 5–20 MPa. The CO₂–SARA interaction energy decreases by about 30%–40% with increasing temperature, but increases by about 50%–60% with increasing pressure. The diffusion rate of SARA molecules is fastest at 523 K and 20 MPa, with diffusion coefficients of 34.8 × 10⁻⁹, 20.4 × 10⁻⁹, 6.2 × 10⁻⁹, and 4.7 × 10⁻⁹ m²/s, respectively. Overall, an injection temperature close to 250 °C combined with pressures exceeding 10 MPa provides optimal conditions for CO₂ diffusion and dissolution, thereby facilitating the extraction of light fractions and maximizing viscosity reduction and thermal recovery performance.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6872-6891"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A nano-micro-continuum framework for liquid flow in multicomponent porous media: Impact of microporosity and microscale effects","authors":"Fu-Gui Liu,&nbsp;Julien Maes,&nbsp;Yong-Fei Yang,&nbsp;Huai-Sen Song,&nbsp;Jun Yao","doi":"10.1016/j.petsci.2026.05.035","DOIUrl":"10.1016/j.petsci.2026.05.035","url":null,"abstract":"<div><div>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 effects, such as adsorption and slip effects, further complicate the dynamic physical processes within nanoporous shale media. In this study, we present a multiscale modeling framework for confined shale oil flow that accounts for microporosity and microscale effects, including slip effects and heterogeneity in fluid density and viscosity. Sensitivity analyses are performed to quantify the impacts of unresolved pore radius, sub-resolution porosity, slip length, and total organic carbon (TOC). Two strategies are employed to represent multiple microporosities: (1) a homogeneous microporosity weighting based on TOC, and (2) an explicitly segmented organic and inorganic microporosity. Our findings reveal that microporosity and microscale effects have a significant impact on the single-phase flow of shale oil, even if microporosity exhibits extremely low permeability. The slip effect substantially enhances the overall permeability compared to the near-wall flow effects, and the contribution of microscale effects diminishes with the increase of sub-resolution porosity and unresolved pore radius. Furthermore, this work suggests that the spatial distribution of organic and inorganic microporosities critically affects the permeability of the rock sample, particularly when the two microporosities show distinct flow mobility. This work provides a novel multiscale modeling approach that integrates unresolved pores with confinement microscale effects, offering improved predictive capability for shale oil flow. Future work should focus on extending the model to multiphase flow conditions and improving the characterization of the microporosity distributions.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6513-6527"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review of matrix acidizing for carbonate reservoirs","authors":"Xiang Chen,&nbsp;Zhao-Xu Deng,&nbsp;Ping-Li Liu,&nbsp;Juan Du,&nbsp;Tian-Yu Zhang,&nbsp;Ying Xiong,&nbsp;Hong-Ming Tang,&nbsp;Wei Li,&nbsp;Zi-Lan Xiong","doi":"10.1016/j.petsci.2026.06.016","DOIUrl":"10.1016/j.petsci.2026.06.016","url":null,"abstract":"<div><div>Carbonate reservoirs are rich in geothermal and petroleum resources, and matrix acidizing is one of the main methods for such reservoir's stimulation. This study systematically reviewed the research progress of matrix acidizing technology for carbonate reservoirs. It introduced the development history of acidizing technology, judgment method of whether to use matrix acidizing, acid-rock reaction mechanism and steps, acid system and its optimization methods, the influencing factors and simulation methods of wormhole, acid distribution processes, optimization methods of construction parameters, real-time diagnosis and effectiveness evaluation methods of acid treatment. Then, the future development trend of matrix acidizing for carbonate reservoirs was prospected. Some interesting insights were as follows. Firstly, due to the influence of factors such as closure stress and rock mechanical properties, there were significant differences in the critical permeability values suitable for matrix acidizing in different reservoirs. Secondly, compared to strong acids, the reaction between weak acids and rocks involved an additional step. Starting from the idea of controlling the steps of acid-rock reaction, a new approach was provided for the development of slow reactive acid fluids for high temperature reservoirs. Thirdly, the dual scale wormhole model had good prospects at the engineering scale, and in the future, it should focus on breaking through the three-dimensional radial flow wormhole extension simulation considering pores, cracks, and caves. Fourthly, uniform acid distribution methods included two categories, i.e., mechanical and chemical methods, with four and six subcategories respectively. Its action areas were in the wellbore and the formation respectively, and the mechanical methods were generally more expensive. Fifthly, the acidizing efficiency was highest when forming the dominant wormhole, and the displacement should be appropriately increased with the increase of injection time during acid treatment. Lastly, it was necessary to focus on establishing evaluation criteria for diversion methods and evaluation method for acidizing effects considering complex reservoir and diversion acidizing.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6460-6481"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An intelligent differential optimization method for fracture parameters in long horizontal wells based on reservoir quality zoning","authors":"Nan-Lin Zhang,&nbsp;Xin-Qi Zeng,&nbsp;Zhi-Feng Luo,&nbsp;Jun-Wen Tao,&nbsp;Ping-Li Liu,&nbsp;Mao-Han Yuan,&nbsp;Qi Zhu,&nbsp;Fu-Shen Liu","doi":"10.1016/j.petsci.2026.05.027","DOIUrl":"10.1016/j.petsci.2026.05.027","url":null,"abstract":"<div><div>Shale reservoirs are characterized by pronounced heterogeneity, rendering conventional homogeneous fracture spacing and experience-based design approaches inadequate for achieving efficient hydraulic fracturing. Meanwhile, numerical simulation methods suffer from high computational cost and limited global optimization capability. To address these challenges, this study proposes an intelligent optimization method for fracture parameter design. First, a reservoir quality index (RQI) is constructed to perform accurate zoning along the horizontal section, enabling targeted fracture parameter design for intervals with distinct reservoir properties. Subsequently, the Tent chaotic mapping, golden sine strategy, and sparrow search algorithm (SSA) are integrated with a backpropagation neural network to develop a TENT-SSA-BPNN model, thereby enhancing the global search capability of fracture parameters. Finally, the net present value (NPV) is adopted as the optimization objective, and the optimal fracture parameter combination is obtained under physical constraints including fracture half-length, fracture conductivity, and stage number. Results demonstrate that the proposed method outperforms conventional models in both accuracy and stability. The optimized design achieves approximately a 30% increase in production, accompanied by a 3 to 5 fold improvement in NPV. The proposed approach provides an efficient and feasible technical pathway for differentiated and precision stimulation design of shale gas horizontal wells.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6482-6501"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A critical review of analytical oil flow rate models for vapour extraction and its non-condensable gas-based hybrids","authors":"Zheng-Bin Wu,&nbsp;Yu-Hang Ren,&nbsp;Morice Richard Mworia,&nbsp;Xiao-Hu Dong,&nbsp;Kun Shu,&nbsp;Shu Jiang","doi":"10.1016/j.petsci.2026.06.039","DOIUrl":"10.1016/j.petsci.2026.06.039","url":null,"abstract":"<div><div>Analytical models are the preliminary reservoir engineering processes performance prediction tools that are quick and less costly compared with experiments and simulations when sufficiently modelled which motivates evaluation of oil drainage rate modelling in the mentioned subjects. The models were derived based on the principles of mass balance (including diffusion/dispersion), Darcy's law, and heat of conduction with minimum convective heat transfer analysis. The majority of the models were based on steady-state flow conditions with a scarcity of models considering unsteady-state conditions. The inverted triangle (linear) and the curved geometries defined the vapour chamber shapes with a lack of curved studies in the hybrids of warm vapour extraction (VAPEX) and non-condensable gas (NCG) with steam. The lateral chamber spreading stage was common in the creation of each model. Limited studies in rising and declining chamber stages were noted especially in the warm VAPEX and hybrids of warm VAPEX and non-condensable gases with steam, enhancing more comprehensive modelling studies that distinguish stages in future works. Hybrids of warm VAPEX and NCG with steam models were discovered to lack validations. A paucity of model uncertainty parameters tuning to match experiments, simulations, and field studies was revealed promoting parameter-tuning sensitivity analysis to estimate most components of uncertainty in the equations and further driving mechanisms exploration in the subsequent research. Modelling modifications are also suggested including sensible heat consideration in the steam heat balance equations that utilized latent heat only.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6528-6541"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A physics-data hybrid model for energy consumption prediction of hydraulic rock drills with applications in petroleum engineering","authors":"Si-Yuan Chang,&nbsp;Ye-Lin Li,&nbsp;Wei Ma,&nbsp;Jia-Le Zhang,&nbsp;Bao-Zhou Xia,&nbsp;Min Ye,&nbsp;Joseph Páez Chávez","doi":"10.1016/j.petsci.2026.05.042","DOIUrl":"10.1016/j.petsci.2026.05.042","url":null,"abstract":"<div><div>To address the issue of high energy consumption in electro-hydraulically driven rock drills, a hybrid energy consumption prediction model integrating physics-informed and data-driven approaches is proposed. First, a physical model of energy transfer is established based on the working principle of the hydraulic rock drill. Rock drilling experiments reveal the influence of the pressure parameter matching mechanism on energy consumption. Excessively high impact pressure significantly increases both the rate of penetration (ROP) and energy consumption, insufficient propulsion pressure tends to cause idle drilling thereby increasing energy consumption, and excessively high buffer pressure reduces impact efficiency and increases energy consumption. Meanwhile, rock properties significantly affect pressure regulation strategies. Soft sandstone exhibits an optimal pressure range, medium-hard limestone achieves the best energy efficiency in the low-pressure range, and hard granite requires high pressure to activate efficient fragmentation. Finally, with the physical model serving as the core framework, a hybrid data-driven compensation model is constructed using Least Squares Support Vector Machine (LSSVM) optimized by the sine cosine algorithm (SCA). Experimental results show that the hybrid model achieves a coefficient of determination (<em>R</em>²) of 0.99, a mean absolute percentage error (MAPE) of 2.18%, and a root mean square error (RMSE) of 59.45 kJ, outperforming both pure data-driven models LSSVM, Random Forest (RF), Multi-Layer Perceptron (MLP), and Gaussian Process Regression (GPR), as well as the pure physical model. By ensuring interpretability through the physical framework and dynamically correcting unmodeled errors with a data-driven compensation mechanism, the model achieves synergistic improvement in accuracy and reliability.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6749-6778"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insight into mass transfer mechanism of CO2–N2 mixed gas with oil","authors":"Jia-Hao Gao,&nbsp;Yu Zhang,&nbsp;Ming-Yuan Wang,&nbsp;Ke Zhang,&nbsp;Ning-Hong Jia,&nbsp;Wei-Feng Lyu","doi":"10.1016/j.petsci.2026.03.060","DOIUrl":"10.1016/j.petsci.2026.03.060","url":null,"abstract":"<div><div>The appropriate selection of CO₂–N₂ mixed gas is critical for cost-effective and efficient gas flooding in enhanced oil recovery. Optimizing this process requires a molecular-level understanding of the interfacial mass transfer mechanisms and their governing factors. This study employs molecular dynamics simulations to reinvestigate the classical surface renewal theory from a molecular perspective, develop a quantitative characterization method for the renewal frequency of surface voids, and elucidate the underlying micro-mechanisms of interfacial mass transfer. It was found that the renewal frequency of surface voids serves as the dominant factor influencing mass transfer, governed by the competition between the gas–oil interaction and the oil–oil interaction. The crude oil extraction efficiency improves with a higher CO₂ mole fraction in the mixed gas. A critical mole fraction (CMF) of CO₂ was identified for different alkane systems, beyond which the mass transfer performance improves significantly. Alkane systems with longer chain lengths are associated with higher CMF values. These results are attributed to the higher molecular density and stronger gas–oil interactions in CO₂-rich mixed gases. Therefore, optimizing the CO₂–N₂ mixed gases with a CO₂ fraction above the system-specific CMF can achieve high mass transfer efficiency while enhancing economic feasibility by reducing reliance on pure CO₂ with high economic costs, providing a foundation and molecular-scale insights for designing gas injection processes.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6892-6902"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A fast bidirectional pressure decay method for measuring permeability and porosity in tight rocks","authors":"Xue-Yuan Li,&nbsp;Feng Zhu,&nbsp;Shao-Jie Zhang,&nbsp;Teng-Yu Wang,&nbsp;Shang-Bin Chen,&nbsp;Yang Wang,&nbsp;Chu Zhang,&nbsp;Jin Xu,&nbsp;Peng Liu","doi":"10.1016/j.petsci.2026.06.047","DOIUrl":"10.1016/j.petsci.2026.06.047","url":null,"abstract":"<div><div>Permeability and porosity parameters of tight rocks are of crucial importance to the applications ranging from extraction of geothermal and hydrocarbon resources to subsurface storage of carbon, nuclear waste, and hydrogen. Separate measurements of permeability and porosity, however, cost time and can produce erroneous results. We designed a bidirectional pressure decay (BPD) experiment to assess the porosity and permeability at the same time. A pressure differential was applied between a gas chamber and a core sample’s two end surfaces. The pressure in chamber (<em>p</em>_c) was recorded with time until the pressure reached an equilibrium pressure (<em>p</em>_e). The porosity of the core sample was computed based on the gas mass amount in chamber and core sample. The mathematical model was derived for this BPD method. The exact solution of the model was validated with numerical results. The late-time solution shows that the difference between <em>p</em>_c and <em>p</em>_e has a linear correlation with time on a semi-logarithmic plot. The permeability was produced based on the slope of the linear regression. Applying confining pressures ranging from 12 MPa to 22 MPa, the BPD method was implemented for estimating the porosity and permeability of a shale sample. The results suggest that it can efficiently measure the stress-dependent porosity (2.23%–2.61%) and permeability (2.21×10⁻⁵–3.72×10⁻⁵ mD) of the sample. This technique has two main advantages: On the one hand, it is highly efficient due to the bidirectional flow pattern, allowing gas to enter the core through both end surfaces and drastically reducing experimental duration; On the other hand, measuring porosity and permeability from a single experiment is more straightforward and precise than testing them separately.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6042-6052"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quaternary spatiotemporal evolution and multi-factor driving mechanisms of continental slope canyon–fan systems in Baiyun sag, Pearl River Mouth Basin, South China Sea","authors":"Guang-Xu Wang,&nbsp;Jun-Ling Pei,&nbsp;Wei Wu,&nbsp;Quan Li,&nbsp;Wei-Qing Liu,&nbsp;Zhi-Feng Xing,&nbsp;Jing Yu","doi":"10.1016/j.petsci.2026.07.002","DOIUrl":"10.1016/j.petsci.2026.07.002","url":null,"abstract":"<div><div>As potential targets for deep-sea hydrocarbon exploration, continental slope canyon–fan systems preserve records of sea-level fluctuations and paleoclimatic changes. The Quaternary canyon–fan system in the Baiyun sag represents a potential reservoir for sand-rich deposits. However, the mechanism governing its Quaternary spatiotemporal evolution, which is influenced by multiple factors, remains unclear, significantly constraining the prediction accuracy of sand-rich deposits in this area. Based on three-dimensional (3D) seismic, drilling/logging, and paleontological datasets, a Quaternary isochronous stratigraphic framework was established for the northern continental slope of the Baiyun sag. Seismic interpretation techniques were employed to delineate the morphology and architecture of slope canyon group and associated slope fans, which enabled the development of a spatiotemporal evolutionary pattern for canyon–fan systems and the revelation of their multifactorial driving mechanisms. Our study demonstrates that: (1) Within the Quaternary target strata, one second-order (T₀) and five third-order sequence boundaries (SB1–SB5) have been identified, leading to the delineation of five third-order sequence units (Sq1–Sq5) with distinct structural characteristics; (2) Sedimentary geomorphic units such as shelf-margin deltas, submarine gullies, canyons, and slope fans have been recognized, collectively forming a complete deep-water source-to-sink (S2S) system; (3) The evolution of canyon–fan systems commenced during the canyon–fan formation stage (Stage 1) under a transgressive background, progressed through the peak stage of canyon incision and fan progradation (Stages 2–3) under a regressive background, and culminated in the canyon–fan decline stage (Stage 4) under another transgressive background; (4) Macroscopic factors, including tectonic activity and climate–sea level changes, controlled sediment supply and the development of canyon–fan systems, while local factors such as sediment provenance patterns and the distance between canyons and the shelf margin regulated the structural configuration and spatial distribution of these systems. The dominant controlling factors undergo shifts over time. Elucidating the spatiotemporal evolutionary patterns of Quaternary continental slope canyon–fan systems, revealing their multifactorial driving mechanisms, and deepening the understanding of dynamic processes within deep-water S2S systems will provide a theoretical basis for subsequent predictions of sand-rich deposits and offer a practical paradigm for global canyon–fan research.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6070-6091"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-branch wavelet-fusion U-Net for vibroseis harmonic noise attenuation","authors":"Yang Liu,&nbsp;Xiao-Tao Wen,&nbsp;Qing-Jun Yang,&nbsp;Huan Zhu,&nbsp;Yun Zhao,&nbsp;Theo Le Gallais","doi":"10.1016/j.petsci.2026.04.051","DOIUrl":"10.1016/j.petsci.2026.04.051","url":null,"abstract":"<div><div>Vibroseis is widely used in land surveys, but source-ground coupling and equipment nonlinearities generate second- and higher-order harmonics as well as narrowband resonance lines. These source-related interferences overlap the target reflection band, markedly degrading the signal-to-noise ratio (SNR) and masking weak reflections. We propose a dual-branch wavelet-fusion U-Net (DW-U-Net) for harmonic noise attenuation. The backbone operates in the time domain, while a wavelet side branch explicitly represents low-frequency background and high-frequency details. A differentiable inverse discrete wavelet transform (IDWT) injects the reconstructed wavelet features into the decoder to structurally suppress harmonic streaks while preserving reflections. Training data are generated by adding higher-order harmonics to a reference sweep and then simulating shot records through forward modeling. On the Marmousi2 model under strong harmonic noise, DW-U-Net increases the whole-shot average SNR from 9.92 dB to 29.29 dB, and achieves residual energy 2.44 × 10⁻³, root mean square error (RMSE) 4.51 × 10⁻⁵, and multiscale structural similarity (MS-SSIM) 0.9959. Experiments on the Marmousi2 model and the public Utah FORGE field data demonstrate that DW-U-Net attenuates coherent harmonic streaks and suppresses narrowband resonance lines in shot records. Compared with DnCNN, a standard U-Net, dual residual network (DURN), and multi-input multi-output U-Net (MIMO-U-Net) trained under the same protocol, DW-U-Net delivers consistently higher SNR under strong noise levels. Time-frequency analyses further show that the main reflection band is well preserved in amplitude and bandwidth, while coherent harmonic remnants are substantially reduced.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"23 10","pages":"Pages 6154-6173"},"PeriodicalIF":6.4,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149095470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}