Geophysical Prospecting最新文献

{"title":"The application of frequency-modulated continuous wave modulated thermoacoustic imaging in geological media","authors":"Chang Liu,&nbsp;Chang Wang,&nbsp;Xu Mao,&nbsp;Weite Zhang,&nbsp;Raquel Isabel Martínez-López,&nbsp;Juan Heredia-Juesas,&nbsp;Jose Martinez-Lorenzo","doi":"10.1111/1365-2478.13663","DOIUrl":"https://doi.org/10.1111/1365-2478.13663","url":null,"abstract":"<p>A thermoacoustics imaging system is investigated in this paper to enhance conventional imaging modalities in geological subsurface situational awareness applications. While thermoacoustics imaging has traditionally been used in biological scenarios like breast cancer detection, this work aims to extend thermoacoustics imaging to geophysical applications by demonstrating that water-saturated sand can be distinguished from dry and oil-saturated sand based on their amplitude differences. This breakthrough enables the feasibility of monitoring water distribution in these media. Moreover, to compensate for the low conversion efficiency from electromagnetic power to thermoacoustics amplitude, the signal modulation method is used by applying the frequency-modulated continuous wave techniques. The experiment results show that the frequency-modulated continuous wave can enhance the signal-to-noise ratio while maintaining a similar resolution as the pulse-excited thermoacoustics wave. These findings pave the way for the future use of thermoacousticsimaging in subsurface sensing and imaging of fluid flow and transport in porous media.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 4","pages":"1154-1170"},"PeriodicalIF":1.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1365-2478.13663","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unified model for microscopic and mesoscopic wave-induced fluid flow in a fluid-saturated porous periodically layered medium","authors":"Jianping Liao,&nbsp;Junxin Guo,&nbsp;Hexiu Liu,&nbsp;Yanbin He,&nbsp;Anyu Li,&nbsp;Liang Cheng,&nbsp;Lin Zhou","doi":"10.1111/1365-2478.13671","DOIUrl":"https://doi.org/10.1111/1365-2478.13671","url":null,"abstract":"<p>The interlayer mesoscopic wave-induced fluid flow and the squirt flow are two important mechanisms for seismic attenuation and dispersion in the fluid-saturated porous layered rock. Although numerous studies have been conducted on these two mechanisms, their combined effects (especially the resulting frequency-dependent anisotropy features) have not been sufficiently investigated. Hence, we propose a concise and rigorous theoretical model to quantify the combined effects of these two mechanisms. We first quantify the squirt flow effects through a wet rock frame for each layer that has frequency-dependent and complex-valued elastic properties. Then, we apply Biot's quasi-static poroelasticity theory to derive the analytical solutions for the effective stiffness coefficients of the periodically layered rock. Using the derived rock stiffness coefficients, we calculate the seismic attenuation and dispersion, as well as the frequency-dependent anisotropy. Two cases are studied, one with alternating water- and gas-saturated layers (constant rock frame properties) and the other with periodically distributed fracture layers (constant saturating fluid properties). The P-waves in these two cases are both influenced by the mesoscopic interlayer wave-induced fluid flow and the squirt flow. However, the SV-wave is solely affected by the squirt flow in the first case and primarily influenced by the mesoscopic interlayer wave-induced fluid flow in the second case, respectively. The wave velocity and attenuation in the first case are isotropic, whereas those in the second case exhibit frequency-dependent anisotropy (induced by the mesoscopic interlayer wave-induced fluid flow). To validate our model, we compare our model to the measured extensional attenuation in a partially saturated sandstone sample under different effective pressures. The joint effects of the mesoscopic interlayer wave-induced fluid flow and the squirt flow observed in the experiments are well predicted by our model. Our model has potential applications in the seismic characterization of reservoirs composed of layered rocks, such as shale reservoirs.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 4","pages":"1125-1140"},"PeriodicalIF":1.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845882","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":"Improving Resolution of Near Surface Structure Imaging Based on Elastic Full Waveform Inversion","authors":"Yihao Wang,&nbsp;Zhiwen Xue,&nbsp;John Bradford,&nbsp;Andrew Gase","doi":"10.1111/1365-2478.70000","DOIUrl":"https://doi.org/10.1111/1365-2478.70000","url":null,"abstract":"<p>Estimating structure of pyroclastic deposits plays an important role in the interpretation of volcanic geology and evaluation of potential hazard. We aim to invert near surface seismic data to produce high-resolution images of pyroclastic density current deposits resulting from the 18 May 1980 volcanic eruption at Mount St. Helens, Washington, USA. Elastic full waveform inversion is a popular data fitting method used to estimate seismic properties of the earth. Due to the great challenges in the convergence of elastic full waveform inversion when inverting high-frequency and complex near-surface land seismic data, we develop a specific workflow to improve the resolution of velocity models that progress from traveltime inversion and surface wave inversion to full elastic full waveform inversion. The final inverted models include fine-scale feature structures that compare favourably to an adjacent outcrop. The final data fitting shows significant improvement with normalized waveform misfit decreasing from 1 to 0.4.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 4","pages":"1141-1153"},"PeriodicalIF":1.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845883","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":"Evolution characteristics and mechanism of coal fracture under resonance excitation based on computed tomography scanning","authors":"Yongjie Ren,&nbsp;Jianping Wei,&nbsp;Zhihui Wen,&nbsp;Jieyun Wei,&nbsp;Yixuan Ma,&nbsp;Shengcheng Wang,&nbsp;Shanjie Su","doi":"10.1111/1365-2478.13670","DOIUrl":"https://doi.org/10.1111/1365-2478.13670","url":null,"abstract":"<p>The resonance of coal reservoir induced by external excitation is a kind of environment-friendly stimulation technology. In this work, an experimental system was established to carry out the coal resonance fracturing experiments, and the change trend of fracture structure was investigated by computed tomography scanning. The results showed that under the excitation of vibration within the resonance frequency band range, the coal fracture will gradually expand to failure. There are three forms of coal fracture expansion under the condition of resonant, which are the formation of slip zones in coal, the formation of fracture at phase interface and the formation of ‘void’. When the excitation frequency is constant, the natural frequency of coal decreases gradually with the expansion of fractures, resulting in the vibration frequency gradually deviating from the natural frequency of coal, and the fracture propagation behaviour of vibrating coal gradually changes from divergence to convergence.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 4","pages":"1106-1124"},"PeriodicalIF":1.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845937","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":"Inclusion-based rock-physics modelling approach with connected-porosity coefficient estimation for shale reservoirs","authors":"Hong-Yu Zhai,&nbsp;Zheng Li,&nbsp;Qiang Guo,&nbsp;Wei Zhang","doi":"10.1111/1365-2478.13669","DOIUrl":"https://doi.org/10.1111/1365-2478.13669","url":null,"abstract":"<p>Rock-physics modelling provides theoretical basis for predicting elastic and anisotropy parameters from petrophysical properties. However, shale rocks usually develop complex pore structures, wherein isolated and connected pores or cracks may coexist. Conventional methods that assume either isolated or connected pores have limited applicability to shale reservoirs. To this end, this work proposes a shale rock-physics modelling method to address pore complexities. In specific, the proposed method combines inclusion-based and Brown–Korringa models to consider both isolated and connected pores in shales. Connected-porosity coefficient is introduced in the modelling to balance the effects of the two pore types. To better handle pore complexities and improve modelling accuracy, the coefficient and pore aspect ratio are jointly estimated from measured vertical P- and S-wave velocities with a global optimization algorithm. Numerical analysis is performed to analyse the general effects of connectivity and pore geometry on elastic properties of shales. The proposed method is applied to a well data from the Longmaxi shale reservoir in southwest China. The method is also compared with two other methods to show its capability of predicting elastic properties with satisfactory accuracy. The estimated connected-porosity coefficient also facilitates the characterization of velocity anisotropy to some degree.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 4","pages":"1086-1105"},"PeriodicalIF":1.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845936","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":"Amendment to ‘Third-order elasticity of transversely isotropic field shales’","authors":"","doi":"10.1111/1365-2478.13661","DOIUrl":"https://doi.org/10.1111/1365-2478.13661","url":null,"abstract":"<p>Audun Bakk, Marcin Duda, Xiyang Xie, Jørn F. Stenebråten, Hong Yan, Colin MacBeth, Rune M. Holt. Third-order elasticity of transversely isotropic field shales. <i>Geophysical Prospecting</i>. 2024; 72:1049–1073. https://doi.org/10.1111/1365-2478.13446</p><p>The wet bulk densities of the tested shale samples were not included in the original article. These values, along with the measurement method, are provided here for clarity.</p><p>Wet bulk densities of tested shales:\u0000\u0000 </p><p>The wet bulk density was determined as the ratio of the sample's weight to its total volume, measured under ambient conditions prior to testing, including the native fluid content of the well-preserved sample.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 2","pages":"457"},"PeriodicalIF":1.8,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1365-2478.13661","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Elastic full waveform inversion for tilted transverse isotropic media: A multi-step strategy accounting for a symmetry axis tilt angle”","authors":"","doi":"10.1111/1365-2478.13667","DOIUrl":"https://doi.org/10.1111/1365-2478.13667","url":null,"abstract":"<p>Song H, Liu Y, Yang J. (2024) Elastic full waveform inversion for tilted transverse isotropic media: A multi-step strategy accounting for a symmetry axis tilt angle. Geophysical Prospecting, 72(7), 2486-2503.</p><p>On the left side of the first page, in the Funding information, the text “National Natural Science Foundation of China, Grant/Award Numbers: 42374136, 41930105, 42004096; Fundamental Research Funds for the Central Universities of China” is incorrect. This should read: “National Natural Science Foundation of China, Grant/Award Numbers: 41930105, 42374126, 42374136, 42004096; Fundamental Research Funds for the Central Universities of China”.</p><p>In the Acknowledgements section, the text “We thank the editors and three reviewers for their constructive comments. We are also grateful to Professor Chao Huang and Professor Liangguo Dong for their help. This work was supported by grants 41930105, 42004296 and 42374126 of the National Natural Science Foundation of China, as well as Fundamental Research Funds for the Central Universities of China.” is incorrect. This should read: “We thank the editors and three reviewers for their constructive comments. We are also grateful to Professor Chao Huang and Professor Liangguo Dong for their help. This work was supported by grants 41930105, 42374126, 42374136, and 42004096 of the National Natural Science Foundation of China, as well as Fundamental Research Funds for the Central Universities of China.”</p><p>We apologize for this error.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 2","pages":"458"},"PeriodicalIF":1.8,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1365-2478.13667","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of pore distribution heterogeneity in carbonate rocks and its effect on acoustic anisotropy","authors":"Xi Duan,&nbsp;Xiangjun Liu,&nbsp;Lixi Liang,&nbsp;Jian Xiong,&nbsp;Yi Ding,&nbsp;Xin Shi,&nbsp;Moubing Luo,&nbsp;Meng Zhu","doi":"10.1111/1365-2478.13668","DOIUrl":"https://doi.org/10.1111/1365-2478.13668","url":null,"abstract":"<p>The pore structure of carbonate rocks is both complex and highly heterogeneous. Accurately assessing acoustic anisotropy is crucial for analysing and predicting the properties of carbonate reservoirs. Numerous experimental studies have investigated the acoustic anisotropy of carbonate rocks, and various fracture detection techniques have been developed. However, these studies have not adequately addressed the impact of the nonuniform distribution of rock pore structures on acoustic anisotropy. The pore structure of computed tomography scanning images of carbonate core can be obtained by using digital image processing techniques, and a method for evaluating pore distribution heterogeneity based on the box-counting method of fractal theory was proposed. A numerical simulation of P-wave azimuthal anisotropy was conducted, and the relationship between the pore distribution heterogeneity index and acoustic anisotropy parameters was analysed. This novel evaluation method for acoustic anisotropy provides a theoretical basis for predicting parameters in carbonate reservoirs.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 4","pages":"1076-1085"},"PeriodicalIF":1.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846089","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":"Three-dimensional gravity forward modelling based on rectilinear grid and Block–Toeplitz Toeplitz–Block methods","authors":"Ling Wan,&nbsp;Shihe Li,&nbsp;Rui Ye,&nbsp;Yifan Wang,&nbsp;Zenghan Ma,&nbsp;Tingting Lin","doi":"10.1111/1365-2478.13658","DOIUrl":"https://doi.org/10.1111/1365-2478.13658","url":null,"abstract":"<div>\u0000 \u0000 <p>The main method for calculating the gravity field involves discretizing the density sources into a stack of rectangular prisms with a regular grid distribution. The analytical formulation of the gravity anomaly for a right-angled rectangular prism is affected by depth, with the kernel function decaying as depth increases. In addition, the efficiency of the computation and the storage requirements often pose challenges. We present a fast computational method for three-dimensional gravity forward modelling of subsurface space using rectilinear grid and apply the Block–Toeplitz Toeplitz–Block method to the rectilinear grid. The size of the upright rectangles increases with depth to offset the effect of depth. We assume that the observation points are distributed on a homogeneous grid, and the kernel sensitivity matrices exhibit a Block–Toeplitz Toeplitz–Block structure, which is symmetric. For rectilinear dissections of subsurface space in MATLAB, the logarithmic interval size is used. The rectilinear mesh can offset the effect of depth to some degree allowing gravity anomalies to decrease more quickly. For the test of a single model, the gravity anomalies decrease faster and more rapidly in the case of the rectilinear grid compared to the uniform grid. In addition to this, we performed simulations on more complex models and demonstrated that using the Block–Toeplitz Toeplitz–Block method on this basis greatly improves the computational efficiency.</p>\u0000 </div>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 2","pages":"459-470"},"PeriodicalIF":1.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115781","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":"Unsupervised learning inversion of seismic velocity models based on a multi-scale strategy","authors":"Senlin Yang,&nbsp;Bin Liu,&nbsp;Yuxiao Ren,&nbsp;Peng Jiang","doi":"10.1111/1365-2478.13665","DOIUrl":"https://doi.org/10.1111/1365-2478.13665","url":null,"abstract":"<p>Deep learning-based methods have performed well in seismic waveform inversion tasks in recent years, while the need for velocity models as labels has somewhat limited their application. Unsupervised learning allows us to train the neural network without labels. When inverting seismic velocity models from observed data, labels are often unavailable for real data. To address this problem and improve network generalization, we introduce a multi-scale strategy to enhance the performance of unsupervised learning. The first ‘multi-scale’ is derived from the conventional full waveform inversion strategy, in which the low-, middle- and high-frequency inversion results are successively predicted during the network training. Another ‘multi-scale’ is to introduce multi-scale similarity as an additional data loss term to improve the inversion results. With 12,000 samples from the overthrust model, our method obtains comparable results with the supervised learning method and outperforms unsupervised methods that rely only on the mean square error as a loss function. We compare the performance of the proposed method with multi-scale full waveform inversion on the Marmousi model, and the proposed method achieves better results at low- and middle-frequencies, and, as a result, it provides good initial models for further full waveform inversion updates.</p>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"73 2","pages":"471-486"},"PeriodicalIF":1.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143115391","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}