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Magnetostratigraphy and Biostratigraphy of the Jurassic sedimentary sequences, Qiangtang Basin, revealed the initial time of the Lhasa-Qiangtang collision Appl. Geophys. (IF 0.7) Pub Date : 2024-03-25 Yong-Yao Zeng, Chong-Hui Sun
The Qiangtang Basin, located in the Tibetan Plateau, is an appropriate area to verify the Lhasa–Qiangtang collision, which was recorded by the middle-upper part of the Yanshiping Group (the Xiali and Suowa Fms) in the basin. However, the chronology of the Xiali and Suowa Fms is HYPERLINK “javascript:;” controversial, which limits comprehending the timing of the Lhasa–Qiangtang collision. More importantly
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Shear wave velocity inversion of marine sediments using deep-water OBS Scholte-wave data Appl. Geophys. (IF 0.7) Pub Date : 2024-03-21 Peng-Fei Yu, Jia-Meng Jiang, Jian-Hua Geng, Bao-Jin Zhang
Acoustic velocity varies in deep-water environments, and the variable-velocity seawater can affect the dispersion characteristics of Scholte wave. To improve the accuracy of inversion, a horizontal layered-seawater and layered-seabed (HLSLS) model is established with continuously varying velocities for seabed S-wave velocity inversion using Scholte wave. First, we deduced the Scholte wave dispersion
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Resistivity tomography based on multichannel electrodes Appl. Geophys. (IF 0.7) Pub Date : 2024-03-04
Abstract With the constantly changing engineering construction sector, the detection accuracy of conventional electrical resistivity tomography (ERT) is no longer sufficient. A multichannel electrode design (MERT)-based ERT is introduced in this paper to address the growing need for resolution. The imaging accuracy of the ERT method is improved through the collection of apparent resistivity data in
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Tectonic framework of Qilian orogen: reveal from an aeromagnetic anomaly feature Appl. Geophys. (IF 0.7) Pub Date : 2024-02-12 Hai Yang, Shengqing Xiong, Qiankun Liu, Daoqing Zhou, Xue Yang, Zhengguo Fan, Zhiye Jia
The Qilian Orogenic belt is one of the typical orogenic belts globally and a natural laboratory for studying plate tectonics. Many researchers have studied the ophiolite and high pressure and ultra-high pressure metamorphic rocks in the Qilian orogen and obtained valuable achievements. However, a hot debate exists on the basement property, the distribution of ophiolite, and the boundaries of tectonic
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Research on a nonlinear hybrid optimal PSO microseismic positioning method Appl. Geophys. (IF 0.7) Pub Date : 2024-02-10 Yang Xiao, Wei-jian Liu, Hao-nan Wang, Meng-jie Hou, Sen-sen Dong, Zhi-zeng Zhang
Impact ground pressure events occur frequently in coal mining processes, significantly affecting the personal safety of construction workers. Real-time microseismic monitoring of coal rock body rupture information can provide early warnings, and the seismic source location method is an essential indicator for evaluating a microseismic monitoring system. This paper proposes a nonlinear hybrid optimal
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Analysis of the operation characteristics of solar-assisted shallow geothermal energy systems in rural residential areas in southern Hebei Province Appl. Geophys. (IF 0.7) Pub Date : 2024-02-08 Hai-Min Wang, Jian-Wei Li, Wen-Guang Jia, Tong-Hui Wang, Xu Wang, Ling-Ling Bao
Shallow geothermal heat has the characteristics of wide distribution and huge reserves. However, for northern rural buildings, the heating load in winter is much greater than the cooling load in summer, and thermal imbalance of the soil is prone to occur. This paper takes rural residences in southern Hebei as an example and designs a solar-assisted shallow geothermal energy system. Compared with the
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Structural controlling conditions for dry hot rock reservoirs in the middle section of the northern margin in the North China Block Appl. Geophys. (IF 0.7) Pub Date : 2024-02-08 Yan-Xu Liu, Wen-Yong Li, Shan-Gao, An-Qi Cao, Zhe-Xin Jiang, Wei-di Meng
According to a comprehensive analysis of regional geology–geophysics, this article focuses on structural conditions for dry hot rocks in the middle section of the northern margin of the North China Block and adjacent areas, revealing the controlling effect of the structure of dry hot rock reservoirs. Based on processing the latest high-precision data from an aeromagnetic survey, studying the characteristics
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Effects of pressure and fluid properties on S-wave attenuation of tight rocks based on ultrasonic experiments Appl. Geophys. (IF 0.7) Pub Date : 2024-01-13 Xuming Pan, Jing Ba, Rupeng Ma, Weihua Liu, Wei Cheng, José M. Carcione
The tight oil/gas reservoirs in China have showed the great exploration prospects and high production potential, with the characteristics of low porosity, low permeability, and significant heterogeneity in formation rocks. It remains a challenge to sort out the relations between reservoir wave responses and rock physical properties, and the further studies on the wave response patterns of tight reservoirs
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Geostatistical inversion method based on seismic waveform similarity Appl. Geophys. (IF 0.7) Pub Date : 2024-01-05 Xue-Bin Ni, Jia-Jia Zhang, Kang Chen, Guang-Zhi Zhang, Bao-Li Wang, Zhuo-Fan Liu, Ying Lin
Seismic stochastic inversion method has received much attention because of its considerable advantage of having higher vertical resolution than deterministic inversions. However, due to the lack of cross-well data, the inversion results typically exhibit poor lateral continuity. Furthermore, the inversion efficiency is low, and the inversion result is highly random. Therefore, this study proposes a
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Improving the resolution of poststack seismic data based on UNet+GRU deep learning method Appl. Geophys. (IF 0.7) Pub Date : 2023-12-29 Ai-Hua Guo, Peng-Fei Lu, Dan-Dan Wang, Ji-zhong Wu, Chen Xiao, Huai-Yu Peng, Shu-Hao Jiang
Most existing seismic data frequency enhancement methods have limitations. Given the advantages and disadvantages of these methods, this study attempts to apply deep learning technology to improve seismic data resolution. First, on the basis of the UNet deep learning method, which combines well-logging and seismic data, a synthetic seismic record is established with logging acoustic data and density
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Causes of the discordance in the south-north distribution of the 2017 Jiuzhaigou earthquake sequences Appl. Geophys. (IF 0.7) Pub Date : 2023-12-27
Abstract In the 2017 Jiuzhaigou earthquake sequence, the distribution of aftershocks in the north of the main earthquake was scattered, while the distribution of aftershocks in the south of the main earthquake was linear and concentrated. The objective of this inquiry is to analyze the dynamic causes underlying such divergent patterns, relying on the horizontal strain rosette, areal strain (As), and
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An approach to analyzing the reliability of tunnel surrounding rock rating results considering uncertainty Appl. Geophys. (IF 0.7) Pub Date : 2023-12-23 Peng He, Si-chen Feng, Feng Jiang, Gang Wang, Zhi-yong Xiao, Yan Chen, Cheng-cheng Zheng
The geological environment of underground engineering is complex and full of various uncertainties, and ensuring the reliability of tunnel surrounding rock rating results is crucial for projects. In this study, we first analyze the interrelationships and indicator weights of international mainstream rating methods of tunnel surrounding rock, and summarize the applicability of each method. Next, based
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Capacitively coupled effect and capacitive decoupling of multichannel controlled-source audio magnetotellurics observations Appl. Geophys. (IF 0.7) Pub Date : 2023-12-19
Abstract Controlled-source audio magnetotellurics, which is a common technology in geophysical surveys, typically uses the multichannel mode of data acquisition. Often, a capacitive coupling effect occurs among the multiple receiving wires and receiving electrodes and the earth. This effect causes the distortion of the observed apparent resistivity and phase curves. The capacitive coupling of the observation
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Porosity prediction in tight sandstone reservoirs based on a one–dimensional convolutional neural network–gated recurrent unit model Appl. Geophys. (IF 0.7) Pub Date : 2023-12-14 Su-Zhen Shi, Gui-Fei Shi, Jin-Bo Pei, Li-Li, Kang Zhao, Ya-Zhou He
Characterizing reservoir porosity is crucial for oil and gas exploration and reservoir evaluation. Due to the increasing demands of oil and gas exploration and development, characterizing reservoir porosity to the required precision using current methods is challenging. Therefore, this study proposes a Pearson correlation–random forest (RF) scheme to select optimal seismic attributes for predicting
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A Hybrid Dung Beetle Optimization Algorithm with Simulated Annealing for the Numerical Modeling of Asymmetric Wave Equations Appl. Geophys. (IF 0.7) Pub Date : 2023-12-14 Xu-ruo Wei, Wen-lei Bai, Lu Liu, You-ming Li, Zhi-yang Wang
In the generalized continuum mechanics (GCM) theory framework, asymmetric wave equations encompass the characteristic scale parameters of the medium, accounting for microstructure interactions. This study integrates two theoretical branches of the GCM, the modified couple stress theory (M-CST) and the one-parameter second-strain-gradient theory, to form a novel asymmetric wave equation in a unified
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Seismic Signal Analysis Based on Adaptive Variational Mode Decomposition for High-speed Rail Seismic Waves Appl. Geophys. (IF 0.7) Pub Date : 2023-12-02 Yang Lei, Lu Liu, Wen-lei Bai, Hai-xin Feng, Zhi-yang Wang
High-speed rails with determined length and load run for long periods at almost uniform speeds along fixed routes, constituting a new stable and repeatable artificial seismic source. Studies have demonstrated the wide bands and discrete spectra of high-speed rail seismic signals. Exploring the abundant information contained in massive high-speed rail seismic signals has great application value in the
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A simplified calculation for adaptive coefficients of finite-difference frequency-domain method Appl. Geophys. (IF 0.7) Pub Date : 2023-12-05 Wen-Hao Xu, Jing Ba, José Maria Carcione, Zhi-Fang Yang, Xin-Fei Yan
The finite-difference frequency domain (FDFD) method is widely applied for simulating seismic wavefields, and a key to achieving successful FDFD simulation is to construct FDFD coefficients that can effectively suppress numerical dispersion. Among the existing FDFD coefficients for seismic wavefield simulation, adaptive FDFD coefficients that vary with the number of wavelengths per grid can suppress
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Permeability Estimation of Shale Oil Reservoir with Laboratory-derived Data: A Case Study of the Chang 7 Member in Ordos Basin Appl. Geophys. (IF 0.7) Pub Date : 2023-11-30 Lin Zhang, Li Gao, Ba Jing, Meng-Bo Zhang, José M. Carcione, Wei-Hua Liu
The shale oil reservoir within the Yanchang Formations of Ordos Basin harbors substantial oil and gas resources and has recently emerged as the primary focus of unconventional oil and gas exploration and development. Due to its complex pore and throat structure, pronounced heterogeneity, and tight reservoir characteristics, the techniques for conventional oil and gas exploration and production face
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Study on Joint Method of 3D Acoustic Emission Source Localization Simplex and Grid Search Scanning Appl. Geophys. (IF 0.7) Pub Date : 2023-11-24 Wei-jian Liu, Hao-nan Wang, Yang Xiao, Meng-jie Hou, Sen-sen Dong, Zhi-zeng Zhang, Gao-ming Lu
Acoustic emission (AE) source localization is a fundamental element of rock fracture damage imaging. To improve the efficiency and accuracy of AE source localization, this paper proposes a joint method comprising a three-dimensional (3D) AE source localization simplex method and grid search scanning. Using the concept of the geometry of simplexes, tetrahedral iterations were first conducted to narrow
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Activity characteristics of significant earthquake swarms in the Bohai Rim region Appl. Geophys. (IF 0.7) Pub Date : 2023-11-11 Jin-Meng Bi, Cheng Song, Fu-Yang Cao
The purpose of this study is to systematically investigate the activity characteristics of the significant earthquake swarms in the Bohai Rim region. We use the epidemic-type aftershock sequence (ETAS) model with good fitting and the Ogata–Katsura 1993 model with full consideration of small earthquake information to fit the sequence parameters of the significant earthquake swarms since 2012, including
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Deformation mechanism and treatment technology research of coal pillars in acute inclined goafs under expressway Appl. Geophys. (IF 0.7) Pub Date : 2023-10-12 Wei-Xing Bao, Zhi-Wei Ma, Hong-Peng Lai, Rui Chen
When the expressway crosses the goafs inevitably, the design is generally to build the road on coal pillars as much as possible. However, the existing coal pillars are often unable to meet relevant requirements of highway construction. Combining three-dimensional physical model tests, numerical simulations and field monitoring, with the Urumqi East Second Ring Road passing through acute inclined goafs
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Development and application of an aeromagnetic survey system for a large load rotary-wing UAV Appl. Geophys. (IF 0.7) Pub Date : 2023-10-07 Jin-Peng Huang, Hua Guo, Song Han, Yan Huang
UAV geophysical surveys can adapt to complex ground exploration environments and greatly reduce the safety risk of operators, which may be applied in geophysical surveys, geological investigations, resource exploration and other fields. Rotary-wing UAV is characterized by its flexible start-stop mode, high safety profile and night navigation. In this paper, according to the DY-115 rotary-wing UAV,
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Detection method of coal-rock interface and low-resistivity anomalous body based on azimuth electromagnetic wave Appl. Geophys. (IF 0.7) Pub Date : 2023-10-02 Gang Chen, Quan-xin Li, Zhi-yi Liu, Long Chen, Yi Zhang
A geological model related to coal-rock electromagnetic parameters is constructed in this work using coal-rock media and coal-rock interfaces as the research objects for electromagnetic wave propagation response. An in-depth analysis was conducted to examine the response characteristics of the electromagnetic wave detection technology for coal and rock geological orientations while drilling in coal
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Application of Soil Parameter Inversion Method Based on BP Neural Network in Foundation Pit Deformation Prediction Appl. Geophys. (IF 0.7) Pub Date : 2023-09-29 Hao-hao Ma, Shuai Yuan, Zhi-zheng Zhang, Ya-hui Tian, Sen-sen Dong
When significant deformation occurs in a foundation pit, it is critical to have an accurate deformation prediction method in place to take timely safety measures. Finite element simulations are strongly affected by soil parameters and do not reflect the dynamic deformation of foundation pits during excavation. Based on the actual soil parameters of a deep foundation pit, 64 representative combinations
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3D transient electromagnetic inversion based on explicit finite-difference forward modeling Appl. Geophys. (IF 0.7) Pub Date : 2023-09-19 Fei Li, Qiang Tan, Lai-Fu Wen, Dan Huang
With the development of computers and forward modeling techniques, three-dimensional (3D) transient electromagnetic inversions are being developed. However, there are few 3D transient electromagnetic inversions based on explicit forward modeling methods. Therefore, in this study, we propose a 3D transient electromagnetic inversion method based on explicit finite-difference forward modeling. For forward
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Seismicity characteristics of secondary faults in the Zhangjiakou-Bohai tectonic zone Appl. Geophys. (IF 0.7) Pub Date : 2023-08-25 Jin-Meng Bi, Fu-Yang Cao, Ling-Qin Meng
We have systematically sorted out the seismic events of each secondary fault and its surroundings in the Zhangjiakou-Bohai tectonic belt and jointly carried out their seismicity characteristic study using the accelerating moment release (AMR) model, which fully reflects the release of energy before earthquakes; the Ogata-Katsura 1993 model, which can reflect the accumulated stress level; the moment
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Methodology and Application of Deep Geothermal Sounding in Low-Resistance Cover Areas Appl. Geophys. (IF 0.7) Pub Date : 2023-08-23 Yong Qiao, Hui Zhang
Taking the Qihe area as an example, this paper compared various geophysical exploration methods in view of the problems of urban construction, deep thermal reservoir burial, and vast overlying low-resistance shield layer in deep karst geothermal exploration. A Controlled-source audio magnetotelluric (CSAMT) method was taken to overcome the problems and detect deep stratigraphic structures in the study
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Longitude correction method for the field magnetic surveyed diurnal-variation correction Appl. Geophys. (IF 0.7) Pub Date : 2023-08-18 Shu-Peng Su, Bo Li, Hai-Yang Zhang, Hui-Qin Zhao
Solar quiet daily variation (Sq) are dependent on local time. Herein, we applied the moving superposition method to separate the Sq component of correction observatory data and performed a time difference correction on the Sq component according to the longitudinal difference between the correction observatory and the field station while maintaining the time of other data components. The data were
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Numerical modeling based on the improved BSO algorithm for asymmetric elastic wave equations Appl. Geophys. (IF 0.7) Pub Date : 2023-08-12 Cheng-fang Zhang, Hai-xin Feng, Zhi-chun Zhou, Wen-lei Bai, Zhi-yang Wang
With the continuous research in seismology, the influence of the heterogeneity caused by microstructure interactions of the medium on seismic wave propagation has been paid more attention. Wang et al. (2020) proposed to describe the complex microstructures of the medium in the framework of the generalized continuum mechanics theory, and derived the asymmetric elastic wave equations containing the characteristic
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Large-Scale Aerial Gamma Spectroscopy for Exploring Sandstone-type Uranium Deposits: A Case Study of Gexi Area, Inner Mongolia Appl. Geophys. (IF 0.7) Pub Date : 2023-07-24 Zhe Jiang, XiaoZhong Han, Zhongyue Lin, Hang Hu, Qiang Lai, Yi Gu, ZhaoJian Wu, Xin Zhao
The surface mineral exploration information of uranium deposits in sedimentary basins is often weak and unidentifiable. To study the rapid, efficient, and economical method, we conducted large-scale and high-precision aerial gamma energy spectrometry measurements using an unmanned helicopter in the Gexi area of the Erlian Basin, Inner Mongolia. The distribution characteristics and enrichment patterns
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Optimized High-order Finite-difference Modeling of Second-order Strain Gradient Wave Field Effects Appl. Geophys. (IF 0.7) Pub Date : 2023-07-15 Zi-hao Hu, Hai-xin Feng, Zhi-chun Zhou, You-ming Li, Zhi-yang Whang
The second-order strain gradient wave equation, which is based on the generalized continuum mechanics theory, can enrich the content of classical continuum mechanics theory with the incorporation of the second-order spatial derivative term of displacement. Furthermore, it incorporates scale parameters of the media characteristics to bridge the gap between a micromodel and classical continuum mechanics
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Pipeline Positioning in Clayey Deposits via Surface-to-Borehole Electromagnetic Induction Method Appl. Geophys. (IF 0.7) Pub Date : 2023-07-12 Guowei Li, Zhiming Ye, Yang Zhou, Guanjun He, Guangyu Liu
Underground pipelines are the lifelines of a modern city. Precise positioning of underground pipelines is crucial to avoid pipeline damage during successive construction above it. However, the detection of deep-buried pipelines in soft clayey deposits remains problematic. Herein, a new surface-to-borehole electromagnetic induction method is proposed by combining the traditional ground electromagnetic
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3D gravity anomaly inversion based on LinkNet Appl. Geophys. (IF 0.7) Pub Date : 2023-07-01 Hou-Pu Li, Rui Qi, Jia-Xin Hu, Yu-Xin Sun
Gravity anomaly inversion is a technique used to estimate underground density distribution using gravity data. This paper proposes a new three-dimensional (3D) gravity anomaly inversion method based on the LinkNet network. Compared with two-dimensional gravity anomaly inversion, 3D gravity anomaly inversion can determine the density distribution of the entire region below the observation surface. Additionally
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Automatic Identification of Seismic Faults via the Integration of ResNet-50 Residual Blocks and Convolutional Attention Modules Appl. Geophys. (IF 0.7) Pub Date : 2023-06-29 Xinwei Wang, Suzhen Shi, Xuejun Yao, Yifan Wang, Hanbo Yang, Danqing Liu, Tianli Wei, Yanbo Wang, Jinbo Pei
Fault identification is an important aspect of seismic data interpretation and a key step in structural interpretation. Traditional fault identification involves manual marking by geological interpreters, which is not only time-consuming and inefficient but also prone to human error. A deep learning–based fault identification method, which uses an attention mechanism to focus on target features, is
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Structural Modeling Based on Human–Computer Knowledge Interaction Appl. Geophys. (IF 0.7) Pub Date : 2023-06-27 Xianglin Zhan, Shun Li, Song Tang, Minzhi Zhang, Cai Lu, Guangmin Hu
Building structural models is a foundational step in the exploration of deep subsurface resources, such as oil and gas. However, in some complex surveys, expert cognition of the subsurface geological structures in the area is often incomplete, and the quality of seismic data rapidly deteriorates, which leads to poor structural interpretation and makes structural modeling a time-consuming and laborious
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Analysis of physical parameters of materials similar to coal and rock mass based on geophysical model construction of mines Appl. Geophys. (IF 0.7) Pub Date : 2023-06-21 Yu-Fei Gong, Chen-Yang Zhu, Guo-Wei Zhu
This paper constructs a geophysical model of hidden disaster-causing anomalies in coal rock for simulation experiments based on the structural design of coal rock seams at the mine working face to study the geophysical response characteristics of geological anomalies in coal rock seams. The material ratio and petrophysical parameters of the coal seam, roof, floor, collapse column, and fault in a mining
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Design of a downhole high-power voltage-regulated power supply system for logging-while-drilling systems based on PWM Appl. Geophys. (IF 0.7) Pub Date : 2023-06-19 Yao Liang, An-Zong Li, Wen-Hui Chen, Chuan-Wei Li, Shi-Xue Chen, Yan Sun
High-power turbine generators are needed in logging-while-drilling systems to supply power to the downhole instruments. The current high-power power supply system employs a rectifier-voltage regulator, and the rectified direct-current (DC) voltage increases with the mud flow rate. Moreover, as voltage regulator modules operate in limited ranges, various impellers and guide wheel combinations are generally
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Attenuation-compensated reverse time migration of GPR data constrained by resistivity Appl. Geophys. (IF 0.7) Pub Date : 2023-06-14 Hong-Hua Wang, Yu-He Xi, Yu-Zeng Lv, Yu-Cheng Wang
The high-frequency electromagnetic waves of ground-penetrating radar (GPR) attenuate severely when propagated in an underground attenuating medium owing to the influence of resistivity, which remarkably decreases the resolution of reverse time migration (RTM). As an effective high-resolution imaging method, attenuation-compensated RTM (ACRTM) can effectively compensate for the energy loss caused by
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Design and implementation of low-cost geomagnetic field monitoring equipment for high-density deployment Appl. Geophys. (IF 0.7) Pub Date : 2023-06-14 Lu-Qiang Sun, Xian-Fu Bai, Jian Kang, Ning Zeng, Hong Zhu, Ming-Dong Zhang
The observation of geomagnetic field variations is an important approach to studying earthquake precursors. Since 1987, the China Earthquake Administration has explored this seismomagnetic relationship. In particular, they studied local magnetic field anomalies over the Chinese mainland for earthquake prediction. Owing to the years of research on the seismomagnetic relationship, earthquake prediction
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Rock burst prevention and control of multifield coupling in longwall working face Appl. Geophys. (IF 0.7) Pub Date : 2023-06-03 Wei-jian Liu, Meng-jie Hou, Sen-sen Dong, Yang Xiao, Hao-nan Wang, Zhi-gang Deng, Zhi-zeng Zhang
This study numerically examines the evolution of the stress and displacement fields of rock sur-rounding an oblique normal fault in the longwall working face of a mine. The aim is to determine the law of activation of an abnormal geological body containing coal and rock mass and to provide timely warnings of geological hazards, such as coal and gas bursts, rock bursts, and flooding during coal mining
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Corrections of logging-while-drilling electromagnetic resistivity logging data acquired from the horizontal well for the shale oil reservoir Appl. Geophys. (IF 0.7) Pub Date : 2023-05-30 Ying-Ming Liu, Lei Wang, Cai-Zhi Wang, Hao Wang, Ping Qiao
The responses of logging-while-drilling (LWD) electromagnetic resistivity logging in horizontal wells are usually complex due to the effect of the strong heterogeneity and anisotropy of the shale oil reservoir. Therefore, the qualitative interpretation and quantitative evaluation of such data are still challenging. To this end, a correction method is developed for the LWD resistivity logging data acquired
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Automatic DEXP method derived from Euler’s Homogeneity equation Appl. Geophys. (IF 0.7) Pub Date : 2023-05-22 Guo-xing Zhao, Yong-ting Wu, Yang Sun, Bin-bin Zhang, Xin Zhou, Feng-jun Wang
The depth from extreme points (DEXP) method can be used for estimating source depths and providing a rough image as a starting model for inversion. However, the application of the DEXP method is limited by the lack of prior information regarding the structural index. Herein, we describe an automatic DEXP method derived from Euler’s Homogeneity equation, and we call it the Euler–DEXP method. We prove
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Research and application of microseismic nonlinear optimal positioning methods Appl. Geophys. (IF 0.7) Pub Date : 2023-05-24 Wei-jian Liu, Yang Xiao, Hao-nan Wang, Meng-jie Hou, Guang-hui Tian, Sen-sen Dong
The impact of vibration wave propagation and various anisotropic media can cause divergence problems in the traditional linear positioning solution process in practical engineering applications. To address this problem, a mathematical algorithm combined with the microseismic positioning principles is developed to formulate a microseismic nonlinear optimal positioning method. The developed algorithm
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Cluster analysis of the domain of microseismic event attributes for floor water inrush warning in the working face Appl. Geophys. (IF 0.7) Pub Date : 2023-05-18 Guo-Jun Shang, Xiao-Fei Liu, Li Li, Li-Song Zhao, Jin-Song Shen, Wei-Lin Huang
Differences are found in the attributes of microseismic events caused by coal seam rupture, underground structure activation, and groundwater movement in coal mine production. Based on these differences, accurate classification and analysis of microseismic events are important for the water inrush warning of the coal mine working face floor. Cluster analysis, which classifies samples according to data
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High-accuracy migration and demigration techniques in active fault seismic exploration Appl. Geophys. (IF 0.7) Pub Date : 2023-05-13 Zhang Yang, Li Wen
To further advance methods of exploring active faults by accurately locating their spatial position and fine structures, it is essential to develop a mathematical method for evaluating the reliability of imaging results in seismic data processing. This research introduces a new technique called “demigration”—the inverse of a seismic wave migration operation—into seismic data processing for active fault
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Rayleigh surface wave inversion based on an improved Archimedes optimization algorithm Appl. Geophys. (IF 0.7) Pub Date : 2023-04-28 Zhen-An Yao, Ren Wang, Fu Yu, Long-Feng Chen, Hong-Xing Li, Xiang-Teng Wang, Pan Wang
Surface wave exploration has the advantages of high shallow resolution, small site limitations, and convenient construction, increasing its use in near-surface exploration. Dispersion curve inversion is an important step in surface wave exploration and is directly related to the acquisition of underground formation information. Similar to numerous geophysical inversion problems, dispersion curve inversion
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Petrophysical characteristics of shale oil reservoirs in the Yanchang Formation, Ordos Basin Appl. Geophys. (IF 0.7) Pub Date : 2023-04-29 Zhu Si-Xin, An Li-Ming, Li Yong-Kang, Zhang Xiao-Dong, Meng Fan-Ke
The mediate-low maturity continental shale oil reservoir in the 7th member of the Triassic Yanchang Formation is one of the main zones for shale oil exploration and development in Ordos Basin, China, but the seismic response mechanism of the reservoir remains unclear. Therefore, developing a new method for “sweet spot” seismic prediction combined with rock physics is necessary. To determine the petrophysical
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Characteristics of lower crustal channel flow and geomorphology of the Tibetan Plateau Appl. Geophys. (IF 0.7) Pub Date : 2023-04-13 Li-juan Zhang, Yong-ge Wan, Zhi-tong Jin, Ya-li Wang
To study the viscosity coefficient and thickness of the viscous layer on the Tibetan Plateau, the relationship between the change in viscosity coefficient and thickness of a lower crustal flow and the change in elevation has been investigated based on the principle of a pipeline flow with different viscosity and thickness of terrain elevation. The viscosity and thickness of the lower crustal flow in
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Application of scattering image wavelet transform in cave recognition: A case study on a bedrock buried hill reservoir in Bongor Basin, Chad Appl. Geophys. (IF 0.7) Pub Date : 2023-03-31 Yu-Jiang Xiao, Tao Song, Li-Deng Gan, Yan Zhang, Wen-Hui Du, Xing-Yan Fan, Xiao-Feng Dai
Caves located in the buried hill reservoir of granite bedrock in Bongor Basin, Chad, are excessively small and cannot be identified in conventional reflection wave imaging profiles because their reflection characteristics are suppressed by the strong reflection of the weathering crust at the top of the buried hill. In contrast to reflection wave imaging, which reflects the reflection characteristics
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1D regularization inversion combining particle swarm optimization and least squares method Appl. Geophys. (IF 0.7) Pub Date : 2023-03-29 Peng Su, LiuYang Xu, Jin Yang
For geophysical inversion problems, deterministic inversion methods can easily fall into local optimal solutions, while stochastic optimization methods can theoretically converge to global optimal solutions. These problems have always been a concern for researchers. Among many stochastic optimization methods, particle swarm optimization (PSO) has been applied to solve geophysical inversion problems
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2D Laplace-Fourier domain acoustic wave equation modeling with an optimal finite-difference method Appl. Geophys. (IF 0.7) Pub Date : 2023-03-25 Jing-Yu Wang, Na Fan, Xue-Fei Chen, Shou-Rui Zhong, Bo-Yu Li, Dan Li, Gang Zhao
Laplace-Fourier (L-F) domain finite-difference (FD) forward modeling is an important foundation for L-F domain full-waveform inversion (FWI). An optimal modeling method can improve the efficiency and accuracy of FWI. A flexible FD stencil, which requires pairing and centrosymmetricity of the involved gridpoints, is used on the basis of the 2D L-F domain acoustic wave equation. The L-F domain numerical
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Sampling rate and necessary conditions for geoelectric structure reconstruction in transient electromagnetic exploration Appl. Geophys. (IF 0.7) Pub Date : 2023-03-25 Qing-Hua Cao, Shu Yan, Wei-Zhong Qiu, Yan-Qing Wu, Ming-Sheng Chen
To improve the detection precision of the transient electromagnetic method, dense observation points and windows are necessary. However, to keep the number of samples in every acquisition window unchanged, the sampling rate of principal transient electromagnetic instruments decreases with transmitter frequency, and the increased windows reduce the original signal-to-noise ratio at the cost of decreasing
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Acquisition parameters and sensitivity analysis affecting the seismic imaging quality of the complex piedmont zone Appl. Geophys. (IF 0.7) Pub Date : 2023-03-18 Hu Zhao, Wen-jun Li, Yong Wu, Zhi-xin Di, Rong-rong Zhao, Wei Chen, Ming-yi Li
High-quality seismic data is key to determining the success or failure of oil and gas exploration in complex mountain fronts. Observation systems are important factors affecting the quality of the seismic collection. Currently, the seismic collection design of piedmont zones is mainly based on optimizing and analyzing a single collection parameter. The multiparameter optimization is not performed as
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Effect of gas saturation on P-wave velocity in tight sandstone Appl. Geophys. (IF 0.7) Pub Date : 2023-03-20 Pan Bao-Zhi, Zhou Wei-Yi, Guo Yu-Hang, Fang Chun-Hui, Zhang Li-Hua
By measuring the variation of the P- and S-wave velocities of tight sandstone samples under water saturation, it was confirmed that with the decrease in water saturation, the P-wave velocity first decreased and then increased. The variation in velocity was influenced by the sandstone’s porosity. The commonly used Gassmann equation based on fluid substitution theory was studied. Comparing the calculated
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Slope displacement prediction based on multisource domain transfer learning for insufficient sample data Appl. Geophys. (IF 0.7) Pub Date : 2023-03-18 Hai-Qing Zheng, Lin-Ni Hu, Xiao-Yun Sun, Yu Zhang, Shen-Yi Jin
Accurate displacement prediction is critical for the early warning of landslides. The complexity of the coupling relationship between multiple influencing factors and displacement makes the accurate prediction of displacement difficult. Moreover, in engineering practice, insufficient monitoring data limit the performance of prediction models. To alleviate this problem, a displacement prediction method
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Joint inversion method of formation shear-wave anisotropy from logging-while-drilling acoustic data Appl. Geophys. (IF 0.7) Pub Date : 2023-03-16 Li Jia-Cheng, He Xiao, Jiang Can
Most sedimentary formations with fine layers can be characterized as transversely isotropic media. The evaluation of shear-wave anisotropy is critical in logging-while-drilling (LWD) applications. We developed a joint method to simultaneously invert formation shear-wave anisotropy and vertical shear velocity using LWD monopole and dipole dispersion data. Theoretical analysis demonstrates that formation
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Acoustic-electrical properties and rock physics models for shale-oil formations: prediction of reservoir properties of interbedded sandstone and shale layers Appl. Geophys. (IF 0.7) Pub Date : 2023-03-13 Meng-Qiang Pang, Jing Ba, Chun-Fang Wu, José Maria Carcione, Tobias Müller
In recent years, the Yanchang shale-oil formations of the Ordos Basin are rich in reserves with complex lithology and structure characteristics, low porosity and low permeability, and weak anomalies for oil and water discriminations, have been the key targets of unconventional oil/gas resource exploration and development in the relevant areas. The joint acoustic-electrical (AE) properties can be used
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Dispersion characteristics of seabed Scholte waves with variable velocity seawater in deep water Appl. Geophys. (IF 0.7) Pub Date : 2023-03-13 Jiang Jia-Meng, Yu Peng-Fei
Acoustic velocity varies in deep-water environments. To obtain accurate inversion interpretations, it is necessary to develop a horizontally layered seawater—seabed (HLSS) model with continuously varying velocities. In this work, we used an HLSS model based on wave theory to deduce the Scholte wave dispersion equations and established an HLSS model based on the acoustic velocity profile and the submarine
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Applicability of standard forward column/row recurrence equations for ALFs Appl. Geophys. (IF 0.7) Pub Date : 2023-03-02 Han-Wei Zhang, Hua Zhang, Xiao-Ling Li, Yong-Qin Yang
Fully normalized associated Legendre functions (fnALFs) are a set of orthogonal basis functions that are usually calculated by using the recurrence equation. This paper presented the applicability and universality of the standard forward column/row recurrence equation based on the isolated singular factor method and extended-range arithmetic. Isolating a singular factor is a special normalization method
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An improved bicubic imaging fitting algorithm for 3D radar detection target Appl. Geophys. (IF 0.7) Pub Date : 2023-03-02 Fan-Ruo Li, Feng Yang, Rui Yan, Qiao Xu, Yi-Jin Li, Hong-Jia Xing
3D ground-penetrating radar has been widely used in urban road underground disease detection due to its nondestructive, efficient, and intuitive results. However, the 3D imaging of the underground target body presents the edge plate phenomenon due to the space between the 3D radar array antennas. Consequently, direct 3D imaging using detection results cannot reflect underground spatial distribution