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Quasi-2D inversion of surface large fixed-loop transient electromagnetic sounding data J. Geophys. Eng. (IF 1.4) Pub Date : 2024-03-11 Feng-Ping Li, Jian-Hua Yue, Hai-Yan Yang, Yun Wu, Zhi-Xin Liu, Zhi-Hai Jiang
In many cases, 1D inversion is still an important step in transient electromagnetic data processing. Potential issues may arise in the calculation of apparent resistivity using induced electromotive force (EMF) due to overshoot and the presence of multi-valued functions. Obtaining reliable and consistent inversion results using a uniform half-space as the initial model is challenging, especially when
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Automatic thrust/fault and edge location with gravity data across the Shillong plateau and Mikir hill complex in northeastern India using the most positive and most negative curvature interpretation J. Geophys. Eng. (IF 1.4) Pub Date : 2024-02-06 Gopal K Ghosh
Northeast India encompasses numerous thrusts, faults, and lineaments with undulated surface topography and is one of the utmost tectonically active regions in the world. Owing to the results of the collision of the Indian Plate under the Tibetan Plate and Burmese Plate, respectively, this area has affected the highest seismic potential zone-V, triggering many earthquakes. The current study area is
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Experimental research on the instability characteristics of the overlying strata structure that characterizes shallow interval goaf mining J. Geophys. Eng. (IF 1.4) Pub Date : 2023-08-23 Bin Wang, Jie Zhang, Xiao Hua Qi, Tong Li, Shou Shi Gao, Li Wang
Here, we analyze the instability characteristics of the overlying strata structure that characterize shallow-depth seams under insufficient goaf in Yushenfu mining area. To simulate the No. 20107 longwall interval working face situated in Nanliang Coal Mine, physical simulation, an acoustic emission (AE) monitoring system, a stress acquisition system and a total station were used. The results indicate
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A new method in reservoir rock classification in carbonate and sandstone formations J. Geophys. Eng. (IF 1.4) Pub Date : 2023-08-22 Hashem Omrani, Mastaneh Hajipour, Saeid Jamshidi, Mohammad Behnood
This study aims to improve rock-type classification by analyzing core data based on the water–oil primary drainage capillary pressure method. A modified empirical equation is proposed using permeability, porosity, and irreducible water saturation to classify rock types based on water–oil primary drainage capillary pressure. We used primary drainage capillary pressure data measured in carbonate and
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Characterization of potential Cu-Au mineralization using electrical resistivity and induced polarization methods: a case study in Eastern Labo, Bicol, Philippines J. Geophys. Eng. (IF 1.4) Pub Date : 2023-04-18 Mel Anthony A Casulla, Hideki Mizunaga
Electrical resistivity and induced polarization (ER-IP) surveys were carried out in Eastern Labo, Bicol, Philippines, to assess the potential Cu-Au mineralization in pyroclastic-covered areas. An electrical resistivity tomography method with a dipole–dipole array was used, and the L1 norm (robust) inversion approach was employed to generate the 16 2D ER-IP models. The analysis of the resistivity and
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Application of the transfer learning method in multisource geophysical data fusion J. Geophys. Eng. (IF 1.4) Pub Date : 2023-04-04 Pengfei Lv, Guoqiang Xue, Weiying Chen, Wanting Song
Using multigeophysical exploration techniques is a common way for deep targets to be explored in complex survey areas. How to locate an unknown underground target using multiple datasets is a great challenge. The useful information in the multisource geophysical model can be extracted and fused with the help of data fusion, which also works well to correct the interpretation divergence brought on by
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Stability mechanism and control technology of large inclined working face roof in large-scale caving area J. Geophys. Eng. (IF 1.4) Pub Date : 2023-02-09 Shoulong Ma, Yueping Wang, Haibo Wang, Linsheng Gao
Based on the compound roof in the 211 112 working face of mine no. 2 in the Xinji area and various newly emerging geological conditions such as crack development in coal seams and major slopes, the roof of the severely sloped working face was studied focusing on the stress, strain and fracture features, along with the mechanism of rib spalling in the coal wall and the grouting strengthening technology
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Least-squares reverse-time migration in VTI media using a T-distribution-based misfit function J. Geophys. Eng. (IF 1.4) Pub Date : 2023-02-01 Xu Guo, Qiang Tan, Xinjun Li, Jianping Huang, Zenghu Ma
Anisotropy of subsurface media can affect the seismic wave travel time estimates, and then affect the imaging of target regions. To calibrate the effect of anisotropy, a VTI (transverse isotropy media with vertical symmetry axis) least-squares reverse-time migration (LSRTM) algorithm is used. However, if seismic data contains noise especially the outliers, the high-quality images cannot be produced
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Seismic geomorphological analysis of channel types: a case study from the Miocene Malay Basin J. Geophys. Eng. (IF 1.4) Pub Date : 2023-02-01 Nurul Adilah Manshor, Meor Hakif Amir Hassan
Imaging the subsurface is a major challenge due to many aspects; the most notable is the resolution of the data, which often leads to misinterpretation of reservoir behaviour and depositional environment. Even with the robust tools available to precisely model the subsurface reservoir and depositional architecture, a precise result is still incorrect if derived from an inaccurate subsurface description
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Internal multiple suppression with convolutional neural network-based transfer learning J. Geophys. Eng. (IF 1.4) Pub Date : 2023-02-01 Xiaozhou Liu, Tianyue Hu, Tao Liu, Zhefeng Wei, Yanjun Xiao, Fei Xie, Wensheng Duan, Yongfu Cui, Gengxin Peng
Deep learning methods have been widely applied to seismic denoising, outperforming existing methods in efficiency and generalization. For internal multiple suppression, however, deep learning models face the challenge of low generalization owing to the variability of internal multiples. This diminishes the advantages of deep learning methods over current processing flows. To overcome this, we redesign
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Excavation unloading response of cylindrical rock-like specimen with axial joints: laboratory experiment and numerical simulation J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Gongyu Hou, Yuliang Zhou, Tielin Zhao, Jinxing Tan, Qinru Zhao, Jiamin Huang
Joints have a significant influence on the deformation and failure mechanism of the surrounding rock. To reveal the influence of axial joint on mechanical response of the roadway surrounding rock after excavation unloading, the deformation and failure characteristics of cylindrical rock-like specimen (CRLS) with an axial joint was studied through laboratory tests and numerical simulation. Also, the
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Gas hydrate reservoir identification based on rock physics modelling and sensitive elastic parameters J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Cunzhi Wu, Lei Han, Feng Zhang, Junzhou Liu, Haifeng Chen, Bangrang Di
Seismic bottom simulating reflections (BSR) analysis and seismic inversion are commonly used for gas hydrate reservoir interpretation. The relationship between gas hydrate saturation and elastic parameters can be influenced by gas hydrate occurrence state (e.g. pore-filling type gas hydrate or load-bearing type gas hydrate), and this may cause inaccurate interpretation. We first used the simplified
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Application of the three-component transient electromagnetic method in gold exploration: a case study of the Heicigou gold deposit in east Kunlun J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Xingchun Wang, Qingquan Zhi, Xiaohong Deng, Junjie Wu, Jie Zhang, Zhonghong Yu, Yi Yang
Heicigou gold mine is a gold polymetallic mine controlled by a northwest trending fault. The magnetic method and induced polarization results show that the gold-bearing alteration zone is distributed discontinuously in a northwest direction, but the spatial distribution characteristics of the alteration zone have not been effectively identified. Although some drilling work has been carried out in the
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Petrophysical characteristics and identification parameters of the Jurassic continental shale oil reservoirs in the Central Sichuan Basin J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Yichen Song, Lianbo Zeng, Fei Gong, Ping Huang, Wenya Lyu, Shaoqun Dong
The Sichuan Basin in south-western China is rich in shale oil in the Jurassic strata. Due to its complex geological characteristics, reservoir identification using current log-constrained seismic inversion methods is difficult. Characteristics of the shale oil reservoirs were tested on the basis of the petrophysical experimentation of core samples from the said strata. Thin sections and logging data
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NMR investigation on gas desorption characteristics in CBM recovery during dewatering in deep and shallow coals J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Yingfeng Sun, Qingxia Lin, Shuaipeng Zhu, Chujian Han, Xiaoliang Wang, Yixin Zhao
Coalbed methane (CBM) development requires dewatering until the reservoir pressure is less than the critical desorption pressure. Significant quantities of CBM in China are buried >1000 m deep. Therefore, the desorption characteristics of deep CBM reservoirs must be investigated for the further development of deep CBM. In this study, the variation laws of adsorbed and free CH4 during adsorption in
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Modeling seismic waves in ocean with the presence of irregular seabed and rough sea surface J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Xiaobo Liu
For the simulation of seismic wavefields in the ocean, it is very important to consider the influences of the irregular seabed and the rough sea surface. To numerically model seismic waves in the ocean, the fluid seawater and the solid seabed must be treated separately, and the air–fluid and fluid–solid boundary conditions must be considered simultaneously. A fluid–solid configuration is created with
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Lithology discrimination based on direct inversion of Poisson impedance for deep tight-sandstone reservoirs J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Lixiang Ji, Zhaoyun Zong
Lithology discrimination plays an important role in characterizing deep-hydrocarbon reservoirs, particularly for tight sandstones with special petrophysical properties. Stable prediction of lithological-sensitive parameters for deep tight sandstones is a significant challenge. In this paper, a direct inversion method of elastic impedance is developed to estimate lithological-sensitive parameters from
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Numerical investigation on seismoelectric wave fields in porous media: porosity and permeability J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Rong Peng, Xingxing Huang, Zichun Liu, Huafei Li, Bangrang Di, Jianxin Wei
Compared with the seismic wave fields, the influence of porosity and permeability to seismoelectric coupling may be more significant. The seismoelectric effect mainly forms the coseismic signals (CS) and interface response (IR). The influences of the porosity and permeability on the two types of seismoelectric field are still not clear. In this paper, we numerically analyze the response characteristics
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Effects of clay types and fractions on elastic properties of artificial clay-bearing sandstones: an experimental study J. Geophys. Eng. (IF 1.4) Pub Date : 2023-01-18 Kuizhou Li, Xuehui Han, Hao Zhang, Tao Fang, Xingping Luo, Junguang Nie
Experimentally understanding the effects of clay type and fraction on the elastic properties of clay-bearing sandstone is crucial for exploring hydrocarbon reservoirs. Therefore, we artificially synthesized a series of pure clay rocks and clay-bearing sandstones with different clay types and fractions, and conducted the ultrasonic measurements to investigate the elastic behaviors. According to experiments
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Pore structure and its effect on acoustic velocity and permeability of reef-shoal carbonates in the Tarim Basin, Northwest China J. Geophys. Eng. (IF 1.4) Pub Date : 2022-12-09 Shuxia Zhang, Changchun Zou, Cheng Peng, Liwen Yan, Xingwei Wu
Experiment and numerical simulation are integrated to investigate the effects of pore structure on physical properties in reef-shoal carbonate samples from the Tarim Basin. The results show three correlation trends between pore structure parameters and physical properties, which closely depend on the pore structure type. The acoustic velocity of the fractured-vuggy type (Structure I) is mainly affected
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The rock fragmentation and crack propagation under TBM tunneling based on particle flow code J. Geophys. Eng. (IF 1.4) Pub Date : 2022-12-09 Donghao Lan, Hongjian Deng, Yanan Gao, Yunlong Wang, Guangkai Zhang
The rock fragmentation and crack propagation of anisotropic rock induced by tunnel boring machine (TBM) tunneling is studied in this paper. First, a numerical model based on the 2D particle flow code (PFC2D) is established and calibrated to reveal the four stages of rock fragmentation. In Stage I (indentation depth 0–0.4 mm), the indentation force beneath the cutterhead increases and decreases dramatically
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AVA inversion for novel fluid indicator considering consolidation parameter J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-29 Wenqiang Yang, Zhifang Yang, Zhaoyun Zong, Qianhao Sun, Xinfei Yan
Geofluid identification from seismic data are crucial for understanding reservoir characteristics. However, fluid indicators based on elastic parameter combinations show strong ambiguity in terms of geofluid identification. Although the effective pore-fluid bulk modulus proves to be the superior fluid indicator in geofluid discrimination, it is limited to empirical models such as the critical porosity
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Fixed-loop TEM surveying using the SQUID magnetometer for deep mineral exploration in a conductive area J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-29 Junjie Wu, Qingquan Zhi, Xingchun Wang, Xiaohong Deng, Yuge Liu, Xiaodong Chen
The Baiyun gold deposits in the Qingchengzi ore concentration area have significant deep exploration potential. Transient electromagnetic (TEM) exploration is conducted to identify ore-bearing strata and ore-controlling structures in the mining area’s periphery. Previous tests have revealed that it is challenging to penetrate the conductive layer to obtain deep information using a conventional in-loop
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High-precision magnetization vector inversion: application to magnetic data in the presence of significant remanent magnetization J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-29 Xiangdong Li, Shuang Liu, Yunxiang Liu, Fufeng Ding, Xiange Jian, Xiangyun Hu
Magnetization vector inversion is essential for obtaining magnetization vector information from subsurface rocks. To obtain focused inversion results that better match the true magnetization distributions, sparse constraints are considered to constrain the objective function. A compact magnetization vector inversion method is proposed that can provide accurate inversion results for magnetic data with
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Seismic inversion and fracture prediction in tilted transversely isotropic media J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-29 Qin Li, Hanlin Wang, Xiaoying Yang, Suibo Ma, Xingye Liu, Jiang Li
The conventional Amplitude variation with offset (AVO) inversion has been mainly developed for the isotropic media and therefore it is generally inapplicable to the anisotropic fractured formations. A set of tilted fractures in isotropic medium can be regarded as a transversely isotropic (TTI) medium. The reflection coefficient equation in TTI media contains many parameters such as anisotropic parameters
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Application of electrical resistivity tomography (ERT) in uranium mining earth dam J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-29 César Augusto Moreira, Leonides Guireli Netto, Pedro Lemos Camarero, Fernanda Barbosa Bertuluci, Marcos Eduardo Hartwig, Reinaldo Domingos
Dams are built to contain water or mining tailings and provide several benefits to society. The safety and stability of these structures are essential since eventual accidents can generate catastrophic damage. The main cause of ruptures is associated with abnormal seepage, which can progress to an internal erosion process. To assess the stability and safety of dams, periodic inspections are carried
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The formation mechanism of the typical hot dry rocks in Hunan Province, China J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-21 Jian Ou, Liangjing Chen, Baojian Zhang, Hua Zhou, Xianchun Tang, Huaqing Bai, Dailei Zhang, Jun Gao
Calculated by using the pipeline model, the burial depths of the 150 and 180°C hot dry rocks (HDRs) are 3.20–3.56 and 3.92–4.36 km in the Reshuiwei geothermal field, respectively, while those in the Huitang geothermal field are 3.13–3.50 and 3.84–4.28 km, respectively. Based on the analysis of the geophysical and terrestrial heat flow data, rock thermal generation rates, and the hydrochemical thermometric
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Gas coal delamination recognition method based on the Fisher discriminant function of trace element characteristics J. Geophys. Eng. (IF 1.4) Pub Date : 2022-11-08 Hui Pan, Wei Zhou, Dezhong Chen, Hongling Zhang, Yunchun Han
Numerous geological factors will affect determining the well bottom position by well depth during the construction of coalbed methane wells, resulting in inaccurate results. By using the trace element characteristics of coal samples to determine the source layer of coal samples, it is possible to avoid making incorrect assumptions. The groove method was used in this study to collect 40 gas coal samples
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Elastic wave pre-stack reverse-time migration based on the second-order P- and S-wave decoupling equation J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-29 Yu Bao, Yong Wang, Guangxiao Deng, Qinghui Mao
The problems of large computation, large storage and low-frequency noises have been the key factors limiting the development of elastic wave pre-stack reverse-time migration (RTM). Most research has centered on the wave equation of first-order velocity stress and using Helmholtz separation to get pure primary and secondary waves. However, the cost is enormous and the amplitude and phase of wavefields
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Comparative study of a novel arithmetic amplitude-phase weighted beamforming method in vector and tensor CSAMT J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-26 Haifeng Fan, Yiming Zhang, Xuhong Wang
Vector controlled-source audio-frequency magnetotellurics (CSAMT) emits electromagnetic waves with a low directivity coefficient using a grounded horizontal electric dipole (HED). During observations in the far-field region (FfR), only a fraction of radiation energy is used. To improve the signal-to-noise ratio (SNR) in the FfR, it is necessary to increase the power of the transmitter or shorten the
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High-resolution time–frequency analysis based on a synchroextracting adaptive S-transform and its application J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-17 Ying Lin, Siyuan Chen, Guangzhi Zhang, Minmin Huang, Baoli Wang
We propose synchroextracting adaptive S-transform (SEAST) by combining the adaptivity provided by the recently introduced ‘Sparse Adaptive S-transform’ (SAST) with the high resolution of synchroextracting spectral decomposition method. Traditional synchroextracting transforms are based on short-time Fourier transforms (STFTs) and their application is limited by having a fixed analysis window size for
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An improved ant-tracking workflow based on divided-frequency data for fracture detection J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-17 Qinghui Xie, Chunduan Zhao, Zhifeng Rui, Shoujun Guan, Wenting Zheng, Hongche Fan
The conventional ant-tracking technique often results in weak transverse continuity or unobvious plane fracture patterns. It also has limited ability to identify small-scale natural fractures. To improve the image quality of fractures, a spectrum decomposition technique has been used in ant-tracking. Although it has achieved good results, it also brings a high workload and judgment difficulty. To solve
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Analysis of singular values in a 3D joint inversion problem of MMT and MCSEM data J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-17 Jéssica Larissa da Silva Pinheiro, Marcos Welby Correa Silva, Ying Rao
Single value decomposition (SVD) is a mathematical method of decomposing a matrix into three other matrices that have very important properties of the original matrix. One of these matrices provides us with the singular values of the original matrix. By analysing these singular values, we can determine whether an inverse problem has an ambiguous solution or whether the solution is stable. With this
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Seismic ambient noise auto-correlation imaging in a CO2 storage area J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-17 Ce Zhao, Yikang Zheng, Yibo Wang, Liang Zhao
Carbon capture and storage is an effective technique for achieving ‘carbon neutrality’. Seismology plays an important role in detecting and monitoring whether CO2 has been safely sealed. However, active seismic surveys are usually incapable of continuous observations. We can extract the body wave and image the subsurface interface directly and continuously via single sensor ambient noise auto-correlation
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Borehole radiation and reception responses for azimuthal shear-wave reflection imaging with an off-centred dipole acoustic tool J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-17 Yanghu Li, Xiaoming Tang, Yuanda Su
Radiation and reception responses of a dipole acoustic logging tool placed eccentrically in borehole fluid are an interesting and important topic in acoustic reflection imaging. Herein, we present a thorough research study on these responses. We treat the wave incidence from the reflector as the radiation from a virtual source and use the cylindrical-wave expansion method to solve both the wave radiation
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Using the multi-component induction logging data to evaluate the geometric parameters of the hydraulic fracture J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-17 Zhengming Kang, Yi Zhang, Binbin Hou, Gang Chen, Xiaolong Hao, Haojie Qin, Wenjuan Qin
Hydraulic fracturing technology can effectively improve the seepage capacity of low-porosity and -permeability reservoirs. Geometric parameters evaluation (height, aperture and length) of hydraulic fracture is essential at different stages of fracturing. This paper presents a new method to evaluate the three parameters of small-scale fractures by multi-component induction logging based on numerical
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Electrical resistivity imaging of an enhanced aquifer recharge site J. Geophys. Eng. (IF 1.4) Pub Date : 2022-10-07 Jon Fields, Tyler Tandy, Todd Halihan, Randall Ross, Doug Beak, Russell Neill, Justin Groves
Enhanced aquifer recharge (EAR) is defined as any engineered structure or enhanced natural feature designed to convey stormwater, surface water or wastewater directly into an aquifer (e.g. aquifer storage and recovery (ASR) wells) or into the vadose zone eventually percolating to an aquifer (e.g. spreading basins, dry well, etc.; USEPA 2021). Identifying the storage and flow capabilities of complex
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Rock physics model for shale gas reservoirs with nanopore adsorption J. Geophys. Eng. (IF 1.4) Pub Date : 2022-09-20 Linjie Yin, Xingyao Yin, Kun Li
Shale gas is primarily concentrated in nanopores extensively distributed in shale. The elastic properties of nanopores are significantly different from those of pores of larger sizes due to surface effects. How nanopores and adsorbed fluids affect the overall elastic properties of rock is rarely studied. Based on a recently developed nano-elasticity theory, a new method for calculating elastic modulus
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Comparisons of five least-squares adaptive matched filtering methods in multiple suppression J. Geophys. Eng. (IF 1.4) Pub Date : 2022-09-20 Zhong-Sheng Wang, Yong-Xin Li, Wu-Que Su, Zhong-Sheng Li, Ji-Feng Zhang
In this paper, we comprehensively compare the application effects of five least-squares adaptive matched filtering methods (the single-channel, the multichannel, the equipoise multichannel, the pseudo multichannel and the equipoise pseudo multichannel) for multiple suppression in three representative datasets with different degrees of orthogonality. By introducing an error function, we can quantitatively
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Seepage visualization and detection of diaphragm wall leakage with electrical potential method: an experimental investigation J. Geophys. Eng. (IF 1.4) Pub Date : 2022-09-20 Junzuo He, Shaoming Liao, Menbo Liu, Zewen Li, Guoqiang Zhao, Junfei Tu
Attributed to the opacity of soil and rock mass, seepage visualization is a thorny problem in the model test around diaphragm wall leakage, which has played an increasingly significant role in deep excavation engineering recently. Enlightened by the geoelectrical field response method, the electrical potential method was proposed in this study. By means of a model experiment, the applicability of the
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Method for assessing the three-dimensional density structure based on gravity gradient inversion and gravity gradient curvature J. Geophys. Eng. (IF 1.4) Pub Date : 2022-09-20 Yu Tian, Huiyou He, Qing Ye, Yong Wang
Compared with gravity data, gravity gradient data can reflect the structural features of density anomalies with higher sensitivity and resolution. Gravity gradient inversion is a common method for interpreting gravity gradient data, but the non-uniqueness of gravity gradient inversion solutions makes it difficult to quickly determine the effectiveness and reliability of the inversion results. To solve
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Improving the 3D facies model with the seismic-derived log volumes: a case study from the Asmari Formation in the Hendijan Field, southwest Iran J. Geophys. Eng. (IF 1.4) Pub Date : 2022-09-20 Aziz Abdolahi, Ali Chehrazi, Hossain Rahimpour-Bonab, Ali Kadkhodaie, Seyedmohsen Seyedali, Ying Rao
The prolific Oligocene-Miocene Asmari Formation is the primary reservoir rock hosting important hydrocarbon resources in Iran and consists of fluvial/deltaic siliciclastic and shallow marine carbonate rocks in the Hendijan Field. Due to the significant facies variability of the formation, the presence and quality of the reservoir pose a significant uncertainty in the characterization of the reservoir
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Augmented deep learning workflow for robust fault prediction over multiple tectonic regimes J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-29 Haidong Chen, Dazhen Tang, Ying Liu, Hongtao Gu, Cunjian Zhou
Over the past decade, deep learning frameworks such as convolutional neural networks (CNNs) have made major research inroads in upstream oil and gas, with applications in seismic processing/imaging, velocity model building, petrophysics, geological seismic interpretation, all the way to development, production and supply chain logistics. CNN fault prediction centers around the idea of image edge detection
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An efficient 3D wave-equation pre-stack time migration for high-density and wide-azimuth data J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-29 Shengtian Zhao, Bo Feng, Xianggong Tang, Xinmin Shang
The sharp increase in data size of the high-density and wide-azimuth seismic acquisition makes seismic processing routines very challenging. To reduce the turn-around time of pre-stack time migration (PSTM) for large-scale field data (terra to petabyte size), we present an efficient wave-equation PSTM that is an approximate version of the double-square-root (DSR) migration for moderate lateral velocity
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Evaluation of membrane quality and entrance pressure of oil-based mud at elevated temperatures J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-29 Shahad Hashem, Talal AL-Bazali, Ali Garrouch, Jalal Owayed
This study fully explored the impact of temperature on the membrane quality of oil-based mud (OBM) using static gravimetric measurements, membrane efficiency and entrance pressure tests. More than 30 shale samples were used to assess the membrane behavior of several OBMs under elevated temperatures. Results suggested that OBM acted as a semi-permeable membrane at low temperatures (25–55˚C) since ion
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A critical investigation of diffuse double layer changes in clay-electrolyte systems at high temperatures J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-29 Talal AL-Bazali
The objective of this work was to explore the impact of temperature on shale swelling and explain it in terms of diffuse double layer mechanics: Debye–Hückel length alterations. This was made possible through the use of a newly developed thermal linear swelling test. Moreover, the combined impact of temperature, dielectric constant of water and ionic strength (ionic concentration) of salt solutions
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Combined multi-branch selective kernel hybrid-pooling skip connection residual network for seismic random noise attenuation J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-20 Meng Zeng, Gulan Zhang, Yong Li, Yiliang Luo, Guanghui Hu, Yanlin Huang, Chenxi Liang
To improve the generalization ability of the single pooling (average or maximum pooling) skip connection residual network (SSN) for seismic random noise attenuation, we present a hybrid-pooling skip connection residual network (HSN). In HSN, the hybrid pooling consists of average and maximum pooling and aims to simultaneously capture the local and global features well, ultimately improving the detail
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TOC estimation of shale oil reservoir by combining nuclear magnetic resonance logging and nuclear physics logging J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-20 Ziyan Feng, Cheng Feng, Yuntao Zhong, Zhijun Qin, Rui Mao, Lei Zhao, Xianghua Zong
The evaluation of source rock properties has become a vital step in logging interpretation. Total organic carbon (TOC) content is the key to estimating the quality and hydrocarbon generation potential of source rocks. In the shale oilfield of the Junggar Basin, the conventional method of calculating the TOC of hydrocarbon source rocks cannot satisfy logging evaluation requirements. This paper predominantly
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Imaging Islamic architecture in the multileveled archaeological settlement of Tell Dibgou, Northeast Nile Delta, Egypt J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-20 Amin Ibrahim, Mahmoud M Senosy, Ali El-Khadragy, Saada Ahmed Saada, Kamal Abdelrahman, Saad S Alarifi, Kevin Mickus
Tell Dibgou, northeastern Nile Delta (Egypt), is a typical type of complex archaeological site that contains ruins from different chronological periods (Pharaonic, Byzantine, Greece-Roman and Islamic), as evidenced by the findings of pottery kilns, pottery shards, fired brick and colored glass. This study aims to image the topmost archaeological layer of Islamic architecture using electrical resistivity
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Seismic reflection waveform inversion based on Gauss–Newton optimization J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-20 Wencai Xu, Guanghui Hu, Binghong He, Zeyuan Du
Owing to the lack of long-offset signals and effective low-frequency components, it is extremely difficult for classical full-waveform inversion (FWI) to obtain the long-wavelength components of medium and deep elastic parameter models. Considering ray theory, reflection traveltime tomography is restricted by resolution, and the reflection waveform inversion (RWI) method of the wave equation, and its
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Joint PP-PS seismic prestack inversion of thin-bed reservoirs J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-20 Chun Yang, Yun Wang
Thin beds are significant targets in seismic exploration of lithological reservoirs. The conventional Amplitude Versus Offset/Angle (AVO/AVA) inversion methods are based on Zoeppritz equations and their approximate formulas under single-interface assumptions, which are not suitable for thin-bed problems. Therefore, AVO/AVA inversion methods for thin-bed reservoirs are needed in high-resolution seismic
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Strong ground-motion prediction equations from induced earthquakes in St. Gallen geothermal field, Switzerland J. Geophys. Eng. (IF 1.4) Pub Date : 2022-08-19 Nitin Sharma, Vincenzo Convertito, Raffaella De Matteis, Paolo Capuano
Ground shaking, whether it is due to natural or induced earthquakes, has always been a matter of concern since it correlates with structural/non-structural damage and can culminate in human anxiety. Industrial activities such as water injection, gas sequestration and waste fluid disposals, promote induced seismicity and consequent ground shaking that can hinder ongoing activities. Therefore, keeping
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Seismic prediction and evaluation techniques for hot dry rock exploration and development J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Guoqiang Fu, Suping Peng, Ruizhen Wang, Jingtao Zhao, Feng Yan, Jingyu Xie, Yi Yang, Xinglong Xie, Yuanyuan Ming, Dan Wang, Jialu Geng, Wangning Qi
Hot dry rock is generally buried deep within the subsurface and exhibits high temperatures, hardness and density, with low porosity and a lack of permeable fluids. It is thus difficult to investigate and poses a high exploration risk. This paper emphasizes the role of seismic exploration in evaluating hot dry rock exploration by exploiting technical advantages, including strong penetration, high resolution
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Optimal design of classic RCD absorption circuit in transient electromagnetic transmitter J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Sheng Zhou, Xiang Zhao, Zhenzhu Xi, Qingxin Qi, He Wang, Xia Long
The classic RCD absorption circuit has been applied to shorten the turn-off time of transmitters. The current way to determine the resistor and capacitor values of the classic RCD circuit is inefficient. In this paper, an intelligent optimization method to design the classic RCD absorption circuit is proposed. First, based on Kirchhoff's law, the working principles of the RCD absorption circuit at
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An ATEM 1D inversion based on K-Means clustering and MLP deep learning J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Mingzhi Shi, Hui Cao
Traditional geophysical inversion methods rely on an assumption of prior knowledge, starting from the establishment of the initial model and ending with the model being modified many times. This iterative process makes the forward modelling results move increasingly closer to the observed data. However, each inversion step requires multiple forward calculations, which consumes considerable time and
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Suppressing the very low-frequency noise by B-spline gating of transient electromagnetic data J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Cong Peng, Kaiguang Zhu, Tianjiao Fan, Yang Yang
Very low-frequency (VLF) communication signals of 15–25 kHz contaminate the transient electromagnetic (TEM) data. The notch filter or Butterworth filter is commonly used to suppress VLF noise in addition to synchronous detection of TEM data such as gating and stacking, while also introducing the TEM signal distortion around the VLF band. We propose a B-spline gating, which suppresses the VLF noise
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An efficient symplectic stereo-modeling method for seismic inversion by using deep learning technique J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Yanjie Zhou, Fan Lu, Xiao Ma, Xueyuan Huang, Chenguang Wang, Xijun He
This paper proposes an efficient symplectic stereo-modeling (SSTEM) method for full waveform inversion (FWI) by using a deep learning technique. To solve the 2D acoustic equation, the SSTEM method uses a third-order optimal symplectic partitioned Runge–Kutta approach as a time-stepping method. An eighth-order stereo-modeling operator is used for spatial discretization. The SSTEM method is then expressed
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Horizon auto-picking with quantitative uncertainty evaluation by using a modified VQ-VAE framework J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Cheng Yuan, Mingjun Su, Changkuan Ni, Xingye Liu, Yunze Xu, Xiangli Cui
In this paper, we propose a novel approach of deep-learning-based seismic horizon auto-picking that introduces a modified vector quantized variational autoencoder (VQ-VAE) framework to improve the accuracy of seismic horizon interpretation and, for the first time, quantitatively evaluate the uncertainty of the auto-picked horizon by exploiting the concept of entropy. Compared with the conventional
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Identifying the carbonate interlayer using the horn response of electromagnetic wave resistivity logging while drilling combined with drilling and mud-logging data during geo-steering J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Cairui Shao, Pangfei Zhang, Jiaqi Ji, Lunjie Chang
The electromagnetic wave propagation resistivity (EWPR) and natural gamma rays (GR) are commonly used in logging while drilling (LWD) to identify the formation interface and for geo-steering. Because the GR logging value of a carbonate reservoir does not change significantly or not change at all, the horn effect of the EWPR is the main basis for identifying the formation interface. However, many factors
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Improving the memory efficiency of RTM using both Nyquist sampling and DCT based on GPU J. Geophys. Eng. (IF 1.4) Pub Date : 2022-07-29 Dawoon Lee, Wookeen Chung
Reverse time migration (RTM) is used to obtain complex structural images of subsurface media. The RTM can be expressed as a zero-lag cross-correlation between the source and receiver wave fields. As imaging conditions can be calculated based on the pre-stored source wavefield and the received wavefield generated during backward modelling, only the source wavefield must be stored in the memory (or disc)