Petroleum Science最新文献

{"title":"Joint inversion with prestack waveform and spectral information for layered media","authors":"Zheng-Yang Kuai,&nbsp;Dan-Ping Cao,&nbsp;Chao Jin","doi":"10.1016/j.petsci.2025.06.004","DOIUrl":"10.1016/j.petsci.2025.06.004","url":null,"abstract":"<div><div>Subsurface reservoirs commonly exhibit layered structures. Conventional amplitude variation with angle (AVA) inversion, which relies on the Zoeppritz equation and its approximations, often fails to accurately estimate elastic parameters because it assumes single-interface models and ignores multiple reflections and transmission losses. To address these limitations, this study proposes a novel prestack time-frequency domain joint inversion method that utilizes the reflection matrix method (RMM) as the forward operator. The RMM accurately simulates wave propagation in layered media, while the joint inversion framework minimizes the misfit between observed and synthetic data in both the time and frequency domains. By incorporating Bayesian theory to optimize the inversion process, the method effectively balances contributions from both time-domain waveforms and frequency-domain spectral information through a weighting factor. Tests on both synthetic data and field data demonstrate that the proposed method outperforms conventional AVA inversion and time-domain waveform inversion in accuracy and robustness. Furthermore, the method demonstrates good robustness against variations in initial models, random noise, and coherent noise interference. This study provides a practical and effective approach for high-precision reservoir characterization, with potential applications in complex layered media.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 4065-4082"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the synergistic effects of dynamic impact damage and acid etching treatment on the mechanical properties and pore characteristics of shale","authors":"Mao Jing,&nbsp;Kang Peng,&nbsp;Tao Wu,&nbsp;Han-Kuo Zhang,&nbsp;Si-Yu Gao","doi":"10.1016/j.petsci.2025.07.011","DOIUrl":"10.1016/j.petsci.2025.07.011","url":null,"abstract":"<div><div>The low porosity and low permeability of shale remain the primary challenges in shale gas exploitation. Traditional single permeability enhancement techniques have shown limited efficacy, failing to effectively address these technical bottlenecks. This study investigates the synergistic effects of perforation-induced permeability enhancement and acidizing operations on the mechanical properties and micro-pore structure of shale. The improved Split Hopkinson Pressure Bar (SHPB) technique was employed to simulate dynamic impact damage under triaxial stress conditions. Damaged and undamaged rock specimens were immersed in a 15% hydrochloric acid solution to fabricate combined-damage specimens and acid-etched specimens with varying damage states. Uniaxial compression tests, X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM) were conducted on these specimens. SEM images were binarized, and combined with low-temperature nitrogen adsorption tests, the effects of different damage states on the mechanical behavior, energy dissipation, micro-morphology, and pore characteristics of shale were systematically evaluated. Results demonstrate that the peak stress and elastic modulus of shale exhibit a negative correlation with acid-etching duration. The mechanical properties of combined-damage specimens are inferior to those of pure acid-etched specimens, with the minimum peak stress reaching 147.10 MPa—a 43.53% reduction compared to untreated specimens. The energy dissipation ratio significantly increases, with a maximum value of 34.74%. XRD analysis reveals that prolonged acid immersion effectively reduces the carbonate content in specimens, while composite treatment accelerates the reaction between rock matrix and acid solution. Microstructural characterization indicates that acid etching enhances the porosity of shale, particularly the area of mesopores and macropores, with more pronounced pore development and a fragmented interface structure. These findings deepen the understanding of physical mechanisms during shale gas extraction and provide critical theoretical support for optimizing integrated permeability enhancement technologies.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 4117-4133"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel fusion of interpretable boosting algorithm and feature selection for predicting casing damage","authors":"Juan Li ,&nbsp;Mandella Ali M. Fargalla ,&nbsp;Wei Yan ,&nbsp;Zi-Xu Zhang ,&nbsp;Wei Zhang ,&nbsp;Zi-Chen Zou ,&nbsp;Tang Qing ,&nbsp;Tao Yang ,&nbsp;Chao-Dong Tan ,&nbsp;Guang-Cong Li","doi":"10.1016/j.petsci.2025.08.011","DOIUrl":"10.1016/j.petsci.2025.08.011","url":null,"abstract":"<div><div>Casing damage resulting from sand production in unconsolidated sandstone reservoirs can significantly impact the average production of oil wells. However, the prediction task remains challenging due to the complex damage mechanism caused by sand production. This paper presents an innovative approach that combines feature selection (FS) with boosting algorithms to accurately predict casing damage in unconsolidated sandstone reservoirs. A novel TriScore FS technique is developed, combining mRMR, Random Forest, and F-test. The approach integrates three distinct feature selection approaches—TriScore, wrapper, and hybrid TriScore-wrapper and four interpretable Boosting models (AdaBoost, XGBoost, LightGBM, CatBoost). Moreover, shapley additive explanations (SHAP) was used to identify the most significant features across engineering, geological, and production features. The CatBoost model, using the Hybrid TriScore-rapper <em>G</em>₁<em>G</em>₂ FS method, showed exceptional performance in analyzing data from the Gangxi Oilfield. It achieved the highestaccuracy (95.5%) and recall rate (89.7%) compared to other tested models. Casing service time, casing wall thickness, and perforation density were selected as the top three most important features. This framework enhances predictive robustness and is an effective tool for policymakers and energy analysts, confirming its capability to deliver reliable casing damage forecasts.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 4157-4173"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TOC","authors":"","doi":"10.1016/S1995-8226(25)00383-8","DOIUrl":"10.1016/S1995-8226(25)00383-8","url":null,"abstract":"","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages i-ii"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface erosion thickness and oxygen isotope of the Early Jurassic lake water in northern Sichuan Basin, evidence from clumped isotopes of shell limestones","authors":"Ping-Ping Li ,&nbsp;Shi-Jie He ,&nbsp;Zhan-Jie Xu ,&nbsp;Dai-Qin Jiang ,&nbsp;Hua-Yao Zou ,&nbsp;Fang Hao","doi":"10.1016/j.petsci.2025.05.030","DOIUrl":"10.1016/j.petsci.2025.05.030","url":null,"abstract":"<div><div>Oxygen isotope (δ¹⁸O) of paleolake water is a key indicator for reconstructing the formation temperature and diagenetic history of lacustrine carbonate minerals. In this study, we use clumped isotopes (Δ₄₇) of lacustrine shell limestones to determine the surface erosion thickness and δ¹⁸O of Early Jurassic lake water in the northern Sichuan Basin. We analyzed nine shell limestone and seventeen shale samples from the Early Jurassic Da'anzhai Member (J₁z⁴) in the Yuanba area. Whether the shell's shapes are well or partially preserved, the J₁z⁴ shell limestones in the Yuanba area show no significant recrystallization and dull cathodoluminescence. These characteristics suggest that the shell limestones did not undergo significant diagenetic alteration during late burial. The Δ₄₇ values of the J₁z⁴ shell limestones range from 0.448 ± 0.005‰ to 0.463 ± 0.006‰, yielding clumped isotope temperature (<em>T</em>_Δ47) of 64.4 ± 0.8 to 69.7 ± 1.4 °C, which is significantly higher than the Early Jurassic paleotemperature. It suggests that the Δ₄₇ of shell limestones was altered by solid-state reordering, meaning the <em>T</em>_Δ47 does not reflect the initial formation temperatures. By integrating organic matter's maturation model (Easy%<em>R</em>_o) of coexisting shales with Δ₄₇ solid-state reordering model of calcite, we constrained the maximum burial temperature (∼170 °C) and the initial formation temperature (∼28 °C) of these shell limestones. Based on reported paleotemperature gradient, we estimated that the surface erosion thickness was about 1500 m. Furthermore, using the determined initial formation temperatures and conventional oxygen isotope thermometer, we determined that the δ¹⁸O values of the Early Jurassic lake water in the Sichuan Basin, which ranged from −10.8‰ to −8.0‰ (SMOW). The reconstructed paleotemperature and δ¹⁸O of lake water suggest that the Early Jurassic in the Sichuan Basin was warm and humid, which was favorable for the deposition of organic-rich lacustrine shale. The methods developed in this study, which employ Δ₄₇ of shell limestones to reconstruct the maximum burial temperature and paleolake environmental conditions, demonstrate broad applicability to the Sichuan Basin and similar lacustrine basins.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 3867-3879"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flow characteristics of shale oil and their geological controls: A case study of the Lucaogou Formation in the Jimsar Sag, Junggar Basin","authors":"Jia-Qi Liu ,&nbsp;Jun-Qian Li ,&nbsp;Zhao-Jing Song ,&nbsp;An-Chao Shen","doi":"10.1016/j.petsci.2025.06.012","DOIUrl":"10.1016/j.petsci.2025.06.012","url":null,"abstract":"<div><div>The Lucaogou Formation in Jimsar has a significant development potential due to its massive shale oil resources. Nevertheless, the complex and heterogeneous lithology, coupled with unclear flow mechanisms, poses a challenge in effectively predicting its development potential. Therefore, it is crucial to clarify the flow characteristics of shale oil and its controlling factors. In this study, we used a flow simulation experiment to investigate the flow characteristics of different samples under various temperatures and confining stresses and quantitatively evaluated flow characteristics using threshold pressure gradient and total loss of flow rate. Additionally, by combining scanning electron microscopy and mercury intrusion capillary pressure techniques for pore structure characterization, and the relationship between microscopic pore structure and flow parameters was discussed. The findings indicate that rock composition and pore throat structure collaboratively control shale oil flow. Mesopores and macropores primarily develop between dolomite or albite, leading to well-developed pore throat structure with larger average throat radius, lower displacement pressure, and better reservoir quality, enhancing shale oil flowability. Dolomitic siltstone often exhibits these characteristics, making it a favorable lithology for shale oil flow. This study reveals the flow mechanism of shale oil under the action of reservoir physical properties, material compositions, temperatures and confining stresses, summarizes the geological characteristics of advantageous reservoirs. It provides theoretical support for layer selection and efficient development of shale oil reservoirs in the Lucaogou Formation of the Jimsar.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 3900-3914"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal maturity effect on the microscopic pore structure and gas adsorption capacity of shale gas reservoirs: A review","authors":"Wei-Dong Xie ,&nbsp;Xiao-Fei Fu ,&nbsp;Hai-Xue Wang ,&nbsp;Yu Sun ,&nbsp;Veerle Vandeginste ,&nbsp;Xiao-Peng Li","doi":"10.1016/j.petsci.2025.07.023","DOIUrl":"10.1016/j.petsci.2025.07.023","url":null,"abstract":"<div><div>Organic matter (OM) is the primary gas occurrence carrier in shale reservoirs due to their abundant nanopores. To reveal the OM pore structure, adsorption capacity and evolution during thermal maturation, this study collected data from samples spanning the entire evolution stage, from immature to over-mature. Scanning Electron Microscope (SEM) observation and low temperature gases adsorption experiments were used to qualitatively-semi-quantitatively and quantitatively analyze OM pore structure evolution, and CH₄ isothermal adsorption experiments were used to reveal the adsorption capacity evolution. Then, the influence and mechanism of maturity and hydrocarbon generation on pore development and adsorption capacity were quantitatively reviewed based on the experimental data. The results show that OM pores are poorly developed in the immature stage due to weak hydrocarbon generation, although micro-fractures are occasionally found at the edges of OM particles. In the low maturity stage, OM pores are partially developed due to liquid hydrocarbon generation, with liquid hydrocarbons also filling some OM pores. The contribution of total organic carbon content (TOC) to adsorption extent is not significant in these two stages. From high to high-over maturity stages, massive gaseous hydrocarbons are generated, significantly improving the surface porosity of OM. Clear positive linear correlations are observed between TOC and adsorption amount. However, the development of OM pores significantly declines when thermal maturity (<em>R</em>_o) exceeds 3.5% due to excessive aromatization. The accuracy of research on the evolution of pore structure and adsorption capacity is limited by several factors: (i) errors caused by sample specification, calculation processes, parameter settings, and kerogen models in isothermal adsorption experiments and molecular simulations; (ii) difficulty in achieving control variables due to the strong heterogeneity of natural maturation shale samples; and (iii) the need to enhance compatibility between thermal simulation experiments and natural thermal evolution. Therefore, isothermal adsorption experiments on bulk shale and molecular simulations of intact shale model are necessary, taking into account the dynamic temperature and pressure of in-situ reservoirs. Moreover, shale samples with varying maturity, influenced by their distance from the paleo-thermal source, may provide significant verification for thermal simulation experiments.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 3967-3990"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OFC","authors":"","doi":"10.1016/S1995-8226(25)00381-4","DOIUrl":"10.1016/S1995-8226(25)00381-4","url":null,"abstract":"","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Page OFC"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydraulic fracturing induced casing deformation and fault activation: from single-well fracturing to well-factory fracturing","authors":"Yu-Ting He ,&nbsp;Yin-Tong Guo ,&nbsp;Yun Jiang ,&nbsp;Xin Chang ,&nbsp;Yu-Xiang Jing ,&nbsp;Ming-Nan Xu ,&nbsp;Chun-He Yang","doi":"10.1016/j.petsci.2025.07.014","DOIUrl":"10.1016/j.petsci.2025.07.014","url":null,"abstract":"<div><div>Hydraulic fracturing-induced casing deformation and fault activation have greatly hindered the safe and efficient development of shale oil and gas resources. In this study, statistical analysis, physical tests, and numerical simulation methods are used to comprehensively analyze hydraulic fracturing-induced fault activation and casing deformation processes. This study is based on the Longmaxi Formation of LZ block, a deep shale gas reservoir in the southwest Sichuan Basin (China), as a geological background. A large amount of field data on fracturing from the LZ Block is counted, and the main influencing factors are analyzed. The main factors of hydraulic fracturing-induced fault slip are (from strong to weak) parameters related to fluid injection volume, parameters related to segments and clusters, and parameters related to injection rate. Combined with physical experiments and numerical simulations, the fault activation law during fracturing has been studied. The degree of casing deformation and fault slip are linearly correlated. For hydraulic fractures to cross faults is very difficult, fault activation and casing deformation can only be mitigated as much as possible. We find that the number of clusters per segment and the injection rate are negatively correlated with the fault slip distance. Reducing the fluid injection volume can mitigate the fault slip distance. Therefore, low injection rates, low fluid volumes, and more clusters per segment are recommended for fracturing in high-risk segments. It is important to note that the scale and risk of fault activation induced by well-factory fracturing is much higher compared to single-well fracturing. In situations with extremely high risk, the injection volume should preferably not exceed 800 m³ to minimize the risk of geological and casing deformation.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 4134-4144"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finite-difference simulation of elastic waves in fluid-solid coupled media with irregular interface","authors":"Xu-Hui Zhou ,&nbsp;Yi-Yuan Wang ,&nbsp;Shou-Dong Huo","doi":"10.1016/j.petsci.2025.06.017","DOIUrl":"10.1016/j.petsci.2025.06.017","url":null,"abstract":"<div><div>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 challenges that affect its accuracy and efficiency. Firstly, the implicit handling of fluid-solid boundary conditions through parameter averaging strategy often results in low simulation accuracy. Secondly, surface topography can introduce staircase diffraction noise when grid spacing is large. To address these issues, this paper presents a novel approach. We derive an implicit expression for fluid-solid boundary conditions based on average medium theory, translating explicit boundary conditions into model parameter modification. This enables implicit handling of fluid-solid boundaries by modifying the parameters near the boundary. Furthermore, to mitigate staircase diffraction noise, we employ multiple interface discretization based on the superposition method. This effectively suppresses staircase diffraction noise without requiring grid refinement. The efficacy of our method in accurately modeling wave propagation phenomena in fluid-solid coupled media is demonstrated by numerical examples. Results align well with those obtained using the spectral element method (SEM), with significant reduction in staircase diffraction noise.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 10","pages":"Pages 4083-4101"},"PeriodicalIF":6.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145384533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}