Journal of Applied Geophysics最新文献

{"title":"An analytical approach to scattering of cylindrical SH waves by a circular-arc hill: Near-source topographic effects","authors":"Xin Chen ,&nbsp;Jinyong Feng ,&nbsp;Yu Zhang ,&nbsp;Denghui Dai ,&nbsp;Ning Zhang","doi":"10.1016/j.jappgeo.2025.105755","DOIUrl":"10.1016/j.jappgeo.2025.105755","url":null,"abstract":"<div><div>A circular-arc hill is a prevalent feature on Earth's landscape. This distinctive convex terrain can significantly affect seismic waves, leading to notable amplification of ground motions. This paper investigates the near-source topographic effects on a circular-arc hill in an elastic half-space using a line source of cylindrical shear horizontal (SH) waves as excitation. By combining wavefunction expansion and mirror image techniques, the wavefields within two distinct subregions, characterized by unknown coefficients, are independently established. These coefficients are resolved through traction-free boundary, stress continuity, and displacement continuity conditions. Based on a comprehensive parametric analysis, the near-source topographic effects of convex topography are systematically studied from the perspectives of both the frequency and time domains. The findings reveal that the extent of amplification or reduction of surface ground motions is substantially influenced by the source location, wave frequency, and hill height. Subsurface displacements further exhibit a distinct focusing effect of the circular-arc hill, contrasting with surface motion patterns.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105755"},"PeriodicalIF":2.2,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research and application of small-loop transient electromagnetic inversion method using improved FLCPSO-IFAH optimization algorithm","authors":"Zhengyu Xu ,&nbsp;Longhuan Liu ,&nbsp;Xian Liao ,&nbsp;Kui Shao ,&nbsp;Nengyi Fu ,&nbsp;Xuquan Hu ,&nbsp;Zhihong Fu","doi":"10.1016/j.jappgeo.2025.105759","DOIUrl":"10.1016/j.jappgeo.2025.105759","url":null,"abstract":"<div><div>The small-loop transient electromagnetic (TEM) method for shallow surface engineering exploration is developing rapidly. However, the research on refined imaging methods of the small-loop TEM is slightly lagging behind, which seriously restricts its application effect in practical engineering and has become a key problem to be solved urgently. In this paper, the application effect of the improved nonlinear optimization algorithm in small-loop TEM method inversion was researched from the aspects of theory and application. Firstly, the operational principles of the PSO-IFAH algorithm were elucidated and its effectiveness in TEM inversion. However, the inversion results of the PSO-IFAH algorithm are easily affected by the search range of the initial model, resulting in reduced computational efficiency and inversion accuracy. Hence, a refined FLCPSO-IFAH inversion method was proposed for resolve the problem by the fast-imaging method and the linear iterative method constraints. The results show that the computation efficiency and accuracy of the FLCPSO-IFAH inversion method were increased by more than 60 % and 55 %. Case studies using known collapsed karst datasets revealed the proposed method's superior resolution and accuracy, particularly in highlighting subtle anomalous features. Finally, the FLCPSO-IFAH method is used for small-loop TEM data inversion. Combined with geological and borehole data, which accurately and effectively reflected the distribution of the surface electrical structure and the distribution of fault structure and dissolution zone were inferred. The research content provides a new and effective method for the refined data processing and interpretation of small-loop TEM.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105759"},"PeriodicalIF":2.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compressed sensing approach to 3D spatially irregular seismic data reconstruction in frequency-space domain","authors":"Xinyue Gong,&nbsp;Shengchang Chen,&nbsp;Yawen Zhang,&nbsp;Ruxun Dou,&nbsp;Wenhao Luo","doi":"10.1016/j.jappgeo.2025.105758","DOIUrl":"10.1016/j.jappgeo.2025.105758","url":null,"abstract":"<div><div>The reconstruction of spatially irregular data is a critical and challenging task in seismic exploration, essential for subsequent tasks like velocity analysis, reservoir inversion, and wave-equation migration imaging. Fortunately, compressed sensing (CS) overcomes the limitations of the Nyquist sampling theorem, providing cost-effective theoretical support for interpolating observed data, and has been widely proven effective in various fields. However, in seismic exploration, the current CS-based methods often struggle to consistently achieve satisfactory reconstruction. We theoretically demonstrate that the deficiency of 3D reconstruction based on CS for spatially irregular data arises from the inconsistency between the random sampling domain and the reconstruction domain. Sampling is randomly performed in the spatial domain, while reconstruction relies on the sparsity in the spatiotemporal domain, conflicting with the principles of CS and limits the accuracy and effectiveness of the reconstruction. To address this, we propose that CS-based reconstruction should be performed solely in the random sampling dimension, ensuring consistency between the two domains. For 3D spatially irregular seismic data, the random sampling dimension corresponds to the spatial domain, such as in time or frequency slices. For 2D CS-based reconstruction in the spatial domain of 3D spatially irregular data, we identify the limitations of the time-slices method, and numerical experiments demonstrate that the frequency-slices method outperforms traditional 3D spatiotemporal CS reconstruction with higher accuracy. Due to the complex characteristics on the frequency slices, a unitive transform cannot capture the sparsity of all components, future work will focus on developing more adaptive sparse transform methods.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105758"},"PeriodicalIF":2.2,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A fusion network for surface wave dispersion curves inversion","authors":"Diyu Cui,&nbsp;Lijing Shi,&nbsp;Dexiang Kong","doi":"10.1016/j.jappgeo.2025.105756","DOIUrl":"10.1016/j.jappgeo.2025.105756","url":null,"abstract":"<div><div>In order to obtain the subsurface shear wave velocity structure quickly and accurately, in this paper, a fusion network inversion analysis method is proposed to solve the disadvantages of the traditional population search optimization inversion method, which has high computational cost and limited applicability. The method uses deep learning training time instead of computing time, so as to achieve near real-time inversion of the dispersion curve. This paper establishes the data set of the velocity structure of the dispersion curves according to the Vs-h empirical relationship in different regions, and constructs and trains the fusion network model (PSO-LSTM-1DCNN-DNN) on this basis, which has a good effect on both validation and test sets. In addition, this study also add 10 % Gaussian noise to the dispersion curve to analyze its uncertainty, and improve the anti-noise ability of the algorithm by Adversarial Autoencoder (AAE). The results show that the accuracy and efficiency of surface wave dispersion curve inversion are significantly improved by the fusion network.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105756"},"PeriodicalIF":2.2,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porosity estimation and reservoir favorite zone extraction through pre-stack seismic AVO inversion: A case study of the galhak-oil formation in the Rawat Basin, Sudan","authors":"Hatim Quer ,&nbsp;Peimin Zhu ,&nbsp;M.Z. Awad ,&nbsp;Muhammad Ali ,&nbsp;Mohamed Elfatih Salaim ,&nbsp;Mohammed Albashir ,&nbsp;Haitham M.A. Osman","doi":"10.1016/j.jappgeo.2025.105754","DOIUrl":"10.1016/j.jappgeo.2025.105754","url":null,"abstract":"<div><div>The Rawat Basin in southwest Sudan has seen significant progress in identifying and drilling numerous structural traps. However, it is essential to acknowledge that exploration efforts in this region have mainly relied on conventional seismic interpretation techniques, without integrating advanced seismic analysis methods. Unfortunately, this limitation has resulted in many recent drilling attempts yielding disappointing outcomes, with dry wells being the predominant result. Recognizing the urgent need to enhance exploration efficacy, this study breaks new ground by presenting the pioneering application of pre-stack simultaneous inversion in the Rawat Basin. By employing this seismic quantitative interpretation approach for the first time in the region, the study aims to overcome existing limitations and uncover previously unidentified stratigraphic reservoirs, ultimately establishing new drilling targets. We applied an integrated approach that combines geological and geophysical methods to estimate porosity and identify favorable zones for potential hydrocarbon presence in the main reservoir target of the Galhak-Oil Formation. The study performed necessary preprocessing of pre-stack seismic data to enhance signal-to-noise ratio and resolution, as well as the compensating for amplitude losses before their use in seismic inversion. During the amplitude versus offset (AVO) inversion process, we estimated reservoir elastic properties and established a relationship between acoustic impedance, Vp/Vs ratio, and effective porosity values based on well logs. This relationship was then applied to the inverted elastic properties to predict porosity far from well locations. The result is a volume representing the distribution of effective porosity, with high porosity values reaching 0.27, which matched the drilling results. Consequently, multiple sand channels with high porosity were identified. Finally, categorical volumes were created by applying cut-offs based on acoustic impedance, Vp/Vs ratio, and porosity volumes. These categorical volumes were then combined using distinct data ranges, resulting in a unique trace value that represents the favored zones of the target reservoir.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105754"},"PeriodicalIF":2.2,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature response of magnetic susceptibility and pore structure of white Bleached sandstone","authors":"Beichen Du ,&nbsp;Jishi Geng ,&nbsp;Qiang Sun ,&nbsp;Xin Hu ,&nbsp;Hao Huang ,&nbsp;Pengda Ma ,&nbsp;Pengfei Li","doi":"10.1016/j.jappgeo.2025.105752","DOIUrl":"10.1016/j.jappgeo.2025.105752","url":null,"abstract":"<div><div>Bleached sandstone is prevalent in the coal fire area of northern Shaanxi with abundant coal resources. The frequent occurrence of coal fire roasting has influenced the properties of upper Bleached sandstone. This study selected white Bleached sandstone near the Shenmu fire-burned area as the object. After high-temperature baking of samples, nitrogen adsorption experiments, scanning electron microscopy experiments, and fractal dimension theory were used to analyze the micropore structure and its complexity. Simultaneously, its mass magnetization was analyzed. The experimental results demonstrated that the adsorption and desorption isotherms of rocks exhibited a reverse ‘<em>S</em>’ shape, with the pore structure exhibiting signs of homogenization. At temperatures exceeding 600 °C, the specific surface area of the samples was lower than that of the Protolith. The microstructure variations in the sample were significantly influenced by temperature, with the internal pores of the sample increasing or enlarging with increasing temperatures, eventually leading to an increase in the sample pore volume. The sample quality magnetization was significantly affected by temperature, and the variation in sample magnetization was divided into three stages, with the degree of temperature influence increasing stepwise at each stage. The third stage was most affected by temperature, and the magnetization rapidly increased with temperature. The higher temperature indicated a lower complexity of the pore structure. The research results can support disaster prevention arising from structural instability and collapse in coal mine roofs caused by fracture development in coal mine roofs from burning rock.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105752"},"PeriodicalIF":2.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geophysical signature of the Salobo IOCG deposit and implications for mineral exploration","authors":"Moriá Caroline de Araújo,&nbsp;Adalene Moreira Silva,&nbsp;Catarina Labouré Bemfica Toledo,&nbsp;Daniel Shkromada de Oliveira","doi":"10.1016/j.jappgeo.2025.105753","DOIUrl":"10.1016/j.jappgeo.2025.105753","url":null,"abstract":"<div><div>Geophysics is a prerequisite for effective mineral exploration projects. Its significance has increased recently with technological advancements, deeper exploration and geophysical data is now a crucial tool for reducing drilling risks. Salobo, a world-class IOCG (Iron Oxide Copper-Gold) deposit (1088.9 Mt. at 0.62 % Cu and 0.35 g/t Au) in the Carajás Mineral Province, is located in secondary structures associated with the first-order Cinzento shear zone. Due to their high sulfide and iron oxide content, IOCG deposits often make excellent geophysical targets. However, the IOCG classification is broad and encompasses deposits with significantly different characteristics. These differences include petrophysical characteristics which directly impact their geophysical signatures and require specific exploration models. Multiscale magnetic, gravity gradiometry, gamma spectrometric, TDEM (Time-Domain Electromagnetics), and DCIP (Direct Current resistivity and Induced Polarization) data collected at Salobo were used to investigate alteration zones and mineralization, highlighting the importance of an integrated approach in geophysical exploration. Priority guidelines for IOCG geophysical exploration were created considering Salobo's geophysical footprint. These can be used to optimize drilling campaigns in geological contexts similar to Salobo's.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105753"},"PeriodicalIF":2.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143901897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inversion of airborne tipper and ground-based data for two-dimensional radio-magnetotelluric using the Gauss-Newton method","authors":"Ke Yi ,&nbsp;Zhiyong Zhang ,&nbsp;Feng Zhou ,&nbsp;Man Li ,&nbsp;Jianhua Wan ,&nbsp;Lei Huang ,&nbsp;Hongze Deng","doi":"10.1016/j.jappgeo.2025.105751","DOIUrl":"10.1016/j.jappgeo.2025.105751","url":null,"abstract":"<div><div>A two-dimensional inversion algorithm based on the Gauss-Newton optimization has been developed for both ground-based and airborne data of Radio-magnetotelluric (RMT). The Finite Element Method (FEM) has been used in the forward modelling of RMT based on the unstructured mesh. The ground-based responses of a synthetic model including apparent resistivity, phase and tipper have been inverted and the lateral resolution of tipper has been evaluated. Then the effect of observed altitude, topography, and noise level on the airborne RMT tipper response and inverted model has been evaluated. Finally, the simultaneous inversion of ground-based data and airborne tipper has been carried out. The synthetic examples indicate that the inversion incorporating tipper data can more distinctly identify lateral resistivity variation in geological structures. The available anomaly included in the airborne tipper caused by the target structure diminishes as observed altitude increases. And the effect of topography on airborne tipper cannot be ignored, which can be eliminated by inversion with topographic consideration. When adequate airborne tipper data can be acquired, a small number of ground-based impedance data is need to be measured for obtaining resistivity values. The combined strategy of dense airborne tipper with sparse ground-based impedance measurement makes the exploration more effective and keeps great reliability for electrical resistivity imaging.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105751"},"PeriodicalIF":2.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep learning-driven multi-frequency seismic inversion for enhanced thin-layer stratigraphic characterization","authors":"Jiangyun Zhang ,&nbsp;Xiaocai Shan ,&nbsp;Shoudong Huo ,&nbsp;Liang Huang ,&nbsp;Wenhao Zheng ,&nbsp;Xuhui Zhou ,&nbsp;Enliang Liu","doi":"10.1016/j.jappgeo.2025.105749","DOIUrl":"10.1016/j.jappgeo.2025.105749","url":null,"abstract":"<div><div>Acoustic impedance derived from seismic data through inversion algorithms serves as a critical parameter for stratigraphic characterization. However, the limited resolution of seismic data poses significant challenges for accurately predicting acoustic impedance. In this study, we demonstrate that multi-frequency band seismic signals, obtained via continuous wavelet transform (CWT) based on a Ricker wavelet, provide a more precise representation of thin-layer acoustic impedance variations than the original seismic signal. Additionally, the Multi-Head Self-Attention Mechanism enables flexible, nonlinear mapping between parameters by capturing contextual relationships. Therefore, integrating a Multi-Head Self-Attention Mechanism with multi-frequency band seismic signals is essential for improving impedance prediction. To leverage these advantages, we introduce the CWT-CNNTrans algorithm. This method combines stratigraphic encoding data with multi-frequency seismic signals, which are processed by multi-scale convolutional neural network (CNN) modules to extract essential stratigraphic features as multi-scale geological priors. These priors are then integrated into a Transformer architecture, enhancing the accuracy of acoustic impedance predictions and improving the characterization of thin-layer structures. Comparative experiments confirm that incorporating multi-scale geological priors and optimizing the network architecture significantly improves prediction accuracy, enhances stratigraphic continuity, and mitigates overfitting in scenarios with limited geophysical data.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105749"},"PeriodicalIF":2.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study on seismic data acquisition techniques in the U-shaped valley of Yarlung Zangbo River","authors":"Jun Zhang ,&nbsp;Rongyi Qian ,&nbsp;Zhenning Ma ,&nbsp;Xiaoqiong Lei ,&nbsp;Xu Liu ,&nbsp;Jianyu Ling ,&nbsp;Guibin Zhang","doi":"10.1016/j.jappgeo.2025.105750","DOIUrl":"10.1016/j.jappgeo.2025.105750","url":null,"abstract":"<div><div>The Yarlung Zangbo River, as the most prominent waterway on the Tibetan Plateau, plays pivotal role in investigating the tectonic evolution and hydrological processes of the Tibetan Plateau. The Second Tibetan Plateau Expedition focused on the high-resolution seismic exploration of the depositional structure within the U-shaped valley of the Yarlung Zangbo River. Confronted with the unique surface conditions of the valley, characterized by extensive cobblestone riverbanks, aeolian deposits, and steep mountainous terrain, coupled with the swift flow and broad expanse of the Yarlung Zangbo River channel, this study initially employed a methodology based on full-wavefield numerical simulation. An analysis of the formation process of intersecting event of reflection wave induced by the U-shaped valley was conducted. This elucidated the impact of the valley substrate interface characterized by varying inclinations on reflection waves. Moreover, addressing challenges posed by seismic data gaps resulting from river-induced interference, the study designed a geometry to mitigate issues arising from diffracted and converted waves. This approach proved conducive to achieving high-precision imaging of the valley morphology. Subsequently, considering the stringent ecological constraints in the Qinghai-Tibet region, where traditional destructive seismic sources are impractical, the study explored the utilization of unmanned aerial vehicle (UAV) seismic sources. This innovative approach overcame the constraints of conducting seismic wave stimulation in locally complex areas such as river channels, aeolian sand regions, and steep mountainous terrain. In conjunction with lightweight and efficient nodal geophones, the study successfully executed a cost-effective, high-quality data acquisition experiment. The obtained seismic reflection data on riverbank deposits exhibit a reliable high signal-to-noise ratio (SNR), offering a geophysical foundation for investigating the formation and evolution of the Yarlung Zangbo River during the Second Tibetan Plateau Expedition.</div></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"239 ","pages":"Article 105750"},"PeriodicalIF":2.2,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}