Journal of Geophysics and Engineering最新文献_第8页

Estimating model parameters from SP anomaly of sheet-shaped sources using Differential Search and Particle Swarm Optimization Algorithms 基于差分搜索和粒子群优化算法的片状源SP异常模型参数估计

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-05-17 DOI: 10.1093/jge/gxad037

Ş. Özyalın, Petek Sındırgı

{"title":"Estimating model parameters from SP anomaly of sheet-shaped sources using Differential Search and Particle Swarm Optimization Algorithms","authors":"Ş. Özyalın, Petek Sındırgı","doi":"10.1093/jge/gxad037","DOIUrl":"https://doi.org/10.1093/jge/gxad037","url":null,"abstract":"\u0000 In this study, the efficiency of estimating the model parameters of sheet-shaped single and multiple-sources of the self-potential (SP) anomaly using the Differential Search algorithm (DSA) was investigated. First of all, noise-free and noisy synthetic anomalies were calculated for a single sheet-shaped source, and its model parameters were estimated by DSA. The DSA inversion was also done for a model consisting of three inclined sheets. In order to test the effectiveness of the method, the same processes were repeated with a more conventional algorithm, PSO, and the solutions of both methods were compared. The results of synthetic anomaly analyses have shown that DSA can predict the parameters as accurately as PSO. Then, both algorithms were also applied to two field SP anomalies (Surda and Beldih) that have been evaluated by different algorithms in the literature. The source of the Surda anomaly is modelled as one sheet, whereas the source model of the Beldih anomaly is assumed to consist of three sheets. The five model parameters for each model were estimated using both algorithms and it is determined that they are in good agreement with the findings of the previous studies. The contribution of the regional background anomaly to the synthetic and field anomalies was also included and regional coefficients were estimated. Finally, it can be concluded that DSA can solve the source parameters without the need for the initial values required in conventional iterative inversion methods and is an efficient and promising algorithm for determining the parameters of SP sources.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48886527","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}

引用次数: 1

Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai‒Tibet Plateau, NW China 青藏高原东北缘木里多年冻土区天然气水合物的成藏条件与模式

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-05-17 DOI: 10.1093/jge/gxad036

Fagen Pei, Xuben Wang, H. Fang, Dashuang He, Meixing He, B. Du, Peng-hui Zhang, Xiaojiang Wang

{"title":"Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai‒Tibet Plateau, NW China","authors":"Fagen Pei, Xuben Wang, H. Fang, Dashuang He, Meixing He, B. Du, Peng-hui Zhang, Xiaojiang Wang","doi":"10.1093/jge/gxad036","DOIUrl":"https://doi.org/10.1093/jge/gxad036","url":null,"abstract":"The Muli permafrost area is the only midlatitude permafrost area where natural gas hydrates (NGHs) have been drilled. Although a series of achievements has been obtained in studies on NGH accumulation conditions in the permafrost area, related studies on gas hydrate stability zones, gas sources and groundwater are still controversial and need further work. Based on geophysical, geological and geochemical data, this paper systematically elaborates the main NGH accumulation conditions in the Muli area in terms of the pressure‒temperature stability conditions, fault structure, gas composition, gas source, reservoir characteristics, groundwater distribution and topographic characteristics. The results show that the thicknesses of the NGH stability zone range from 491.0 m to 962.7 m. The fault structure can provide a pathway for hydrocarbon gas migration from deep to NGH stability zones, in which thrust faults can prevent the upwards migration of gas by sealing it below the hanging wall block. Rock fractures in the NGH stability zone can not only be gas migration channels but also serve as a reservoir space for NGH accumulation. The hydrocarbon gas of NGHs shows multiple origins and is mainly composed of oil‒associated gas. The formation of frost mounds related to the overpressured gas ejection caused by NGH decomposition may imply the existence of NGHs. Synthetically, similarities and differences in NGH accumulation conditions between the Muli permafrost area and other high‒latitude permafrost areas are proposed, and the “regression” NGH accumulation pattern in the Muli area is constructed. The study results can enrich theoretical knowledge of terrestrial NGH accumulation, and provide scientific guidance for NGH exploration in mid-latitude permafrost areas.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43289555","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}

引用次数: 0

Correction: Seismic profile denoising based on common-reflection-point gathers using convolution neural networks 校正：使用卷积神经网络基于共反射点集的地震剖面去噪

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-05-15 DOI: 10.1093/jge/gxad027

引用次数: 0

CG-DAE: A noise suppression method for two-dimensional transient electromagnetic data based on deep learning CG-DAE:一种基于深度学习的二维瞬变电磁数据噪声抑制方法

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-05-08 DOI: 10.1093/jge/gxad035

Shengbao Yu, Yihan Shen, Yang Zhang

{"title":"CG-DAE: A noise suppression method for two-dimensional transient electromagnetic data based on deep learning","authors":"Shengbao Yu, Yihan Shen, Yang Zhang","doi":"10.1093/jge/gxad035","DOIUrl":"https://doi.org/10.1093/jge/gxad035","url":null,"abstract":"\u0000 The transient electromagnetic method (TEM) is a geophysical exploration method that can efficiently acquire subsurface electrical parameters. For airborne, towed, and other mobile platforms TEM systems, large data volumes, and the traditional one-dimensional denoising method with low efficiency and low signal-to-noise ratio (SNR) of late-time are the main bottlenecks limiting its reliable application. To address this problem, this paper proposes a neural network structure suitable for two-dimensional (2D) TEM data processing. The proposed structure combines a classical convolutional neural network denoising autoencoder with a gated recurrent neural network autoencoder, called the CNN-GRU dual autoencoder (CG-DAE). This method can directly input 2D TEM response data as images into the network for processing, which greatly improves data processing efficiency compared to single-time-channel processing. The simulation experiments verified the effectiveness of CG-DAE. After using CG-DAE denoising, the SNR of the late-time (0.2 ms∼1 ms) signals is improved to nearly 29 dB, the 2D anomaly layer position is clear, and the relative error (RE) between the denoised data and the corresponding clean data is less than 1.41%, while the RE of the late-time signals can be reduced to 3.68%. The proposed method can lay the foundation for fast processing of TEM data based on mobile platforms such as airborne and towed.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43534884","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}

引用次数: 2

A simple method for fast simulation of total reflection waves of single-well imaging with eccentric tools 一种快速模拟偏心工具单井成像全反射波的简单方法

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-04-29 DOI: 10.1093/jge/gxad034

Jiaqi Xu, Hengshan Hu, B. Han

{"title":"A simple method for fast simulation of total reflection waves of single-well imaging with eccentric tools","authors":"Jiaqi Xu, Hengshan Hu, B. Han","doi":"10.1093/jge/gxad034","DOIUrl":"https://doi.org/10.1093/jge/gxad034","url":null,"abstract":"\u0000 In the exploration of unconventional oil and gas reservoirs, single-well acoustic imaging has become an important technique to detect geophysical structures around the borehole. In this study, we propose a simple method to calculate the total reflection wavefields of pressure and displacement for single-well imaging (SWI) with eccentric monopole or dipoles. To calculate the pressure at the eccentric site for incident waves with different angles of incidence and azimuth, reciprocity is applied to the radiation from the eccentric monopole source and the far-field forces generating the waves corresponding to the incident waves. Displacement solutions are derived by calculating the gradient of the pressure fields. When considering eccentric monopole or dipole sources for an inclined reflector outside the borehole, reciprocity is again used to derive the total reflection waves, including the same type of waves (P-P/SV-SV/SH- SH) and the converted waves (P- SV/SV-P). The analytical results agree well with the reference solutions of the 3D finite difference time-domain method, illustrating the validation of the method. The analysis shows that the pressure amplitude in the eccentric position is greater than that in the borehole axis, proving that the eccentric monopole can increase the weak amplitude of reflection waves. We also simulate the wavefields for the acoustic imaging model for eccentric monopole and dipoles. The results show that the pressure and displacement wavefields in the eccentric position are sensitive to the azimuth angle of the reflector, proving that SWI with eccentric logging tools is capable of identifying the azimuth angle.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46913867","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}

引用次数: 0

Effects of temperature and pressure on the wave responses of deep carbonate reservoirs 温度和压力对深层碳酸盐岩储层波浪响应的影响

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-04-26 DOI: 10.1093/jge/gxad033

Chuantong Ruan, Fei Li, J. Ba, J. Carcione, Chun-ping Wu

{"title":"Effects of temperature and pressure on the wave responses of deep carbonate reservoirs","authors":"Chuantong Ruan, Fei Li, J. Ba, J. Carcione, Chun-ping Wu","doi":"10.1093/jge/gxad033","DOIUrl":"https://doi.org/10.1093/jge/gxad033","url":null,"abstract":"\u0000 Deep carbonate reservoirs are subject to in-situ conditions of high temperature and high pressure. We consider six water-saturated dolomite specimens from these reservoirs and perform ultrasonic experiments to obtain the P- and S-wave waveforms and velocities at different pressure and temperature conditions. The P-wave attenuation is estimated with the spectral-ratio method. The results show that with the increase of temperature, the velocities slightly decrease and attenuation increases. At effective pressures less than 40 MPa, the P-wave velocities increase sharply with pressure, and then approximately linearly at higher pressures, while attenuation decreases gradually with pressure. The crack porosity as a function of pressure is obtained from the experimental data. The P-wave velocities decrease with this porosity while attenuation has an opposite behaviour. Then, a multiscale poroelasticity model considering micro-, meso- and macro-scale fluid-flow mechanisms is proposed, to analyze the effects of the fluid properties, temperature, and crack content on the wave responses. The model results agree well with the experimental data at different pressures, which provides a theoretical basis for the analysis of broadband wave velocity dispersion and attenuation phenomena of carbonate reservoirs and underground porous media in general.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44859523","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}

引用次数: 0

Hydrogeological spatial modelling: A comparison between frequentist and Bayesian statistics 水文地质空间建模:频率统计与贝叶斯统计的比较

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-04-26 DOI: 10.1093/jge/gxad023

Jason M Romero, Daniel C Salazar, Carlos E. Melo

{"title":"Hydrogeological spatial modelling: A comparison between frequentist and Bayesian statistics","authors":"Jason M Romero, Daniel C Salazar, Carlos E. Melo","doi":"10.1093/jge/gxad023","DOIUrl":"https://doi.org/10.1093/jge/gxad023","url":null,"abstract":"\u0000 In the following research, traditional and modern spatial prediction techniques are applied in the analysis of water quality, evidencing a new approach that allows the modeling of a hydrogeological system in the central area of Boyacá, Colombia. The objective is to determine the quality status of groundwater for human consumption. In the process, spatial predictions were made based on frequent methods (Kriging - Cokriging) and Bayesian methods (R-INLA SPDE) as an alternative to MCMC methods that require a large computational cost. From the application of these methods, a comparison is made by statistical tests that determine the goodness of adjustment of the predictions. The interest is based on the implementation of future more robust, economic and scientific solutions, particularly for hydrogeological data and this way properly manage water resources. Finally, the vulnerability of the aquifers is analyzed with the DRASTIC method, which takes into account the surrounding media of the aquifers through the variables Depth (D), Net Recharge (R), Type of Aquifer (A), Soil (S), Topography (T), Impact of the vadose zone (I) and Hydraulic conductivity (C)","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61719043","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}

引用次数: 0

Goaf area detection using high-precision wavefield imaging method of ground-airborne transient electromagnetics 地空瞬变电磁高精度波场成像法探测采空区

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-04-26 DOI: 10.1093/jge/gxad028

Hang Yang, Wangsheng Cheng, Z. Qi, H. Cao, Xiu Li, N. Sun, Jie Ma

{"title":"Goaf area detection using high-precision wavefield imaging method of ground-airborne transient electromagnetics","authors":"Hang Yang, Wangsheng Cheng, Z. Qi, H. Cao, Xiu Li, N. Sun, Jie Ma","doi":"10.1093/jge/gxad028","DOIUrl":"https://doi.org/10.1093/jge/gxad028","url":null,"abstract":"\u0000 The coal goaf areas are the main cause of accidents involving water intrusion in coal mines. The ground collapse caused by water intrusion in goaf areas pose major threats to further coal mining. As the conventional ground-based transient electromagnetic method is difficult to perform due to the hilly terrain in the Loess Plateau. In this study, a ground-airborne transient electromagnetic method for detecting coal goaf areas on the Loess Plateau was presented. First, a numerical model was built using the geological data of the study area. The TEM responses of the coal goaf area were determined by forward modeling. Then, the high-precision wavefield transformation method was applied to image the forward model. It was found that compared with the apparent resistivity definition method, the results of the high-precision wavefield transformation method more accurately represented the subsurface structures and the volume effect was avoided. Finally, the high-precision time sweep wavefield imaging method was applied to process the field data. The results revealed that the high-precision wavefield imaging method was able to accurately determine the locations of the goaf areas. In addition, the upper and lower interfaces of the strata and the goaf areas were clearly identified.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45500775","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}

引用次数: 1

3D pole-pole responses of buried anisotropic targets and various anisotropic backgrounds in direct-current resistivity survey 直流电阻率测量中埋藏各向异性目标与各向异性背景的三维极-极响应

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-04-18 DOI: 10.1093/jge/gxad030

Fengqun Ma, H. Tan, Wenxin Kong, Depeng Zhu

{"title":"3D pole-pole responses of buried anisotropic targets and various anisotropic backgrounds in direct-current resistivity survey","authors":"Fengqun Ma, H. Tan, Wenxin Kong, Depeng Zhu","doi":"10.1093/jge/gxad030","DOIUrl":"https://doi.org/10.1093/jge/gxad030","url":null,"abstract":"\u0000 Many rocks often have the electrical anisotropy property that produces quite different responses from the electrical isotropic rocks. We applied an advanced modeling method to calculate the apparent resistivity responses over an anisotropic target in a homogenous isotropic backgound and an isotropic target embedded in different anisotropic host rocks. We demonstrated comprehensive modeling experiments to characterize the responses of surface pole-pole surveys to the buried targets in different geological backgrounds, which vary in the principal resistivities and Euler angles of the targets or the host rocks. Our modeling results show that: (1) the location of current injection controls the apparent resistivity images in value and shape; (2) almost circle-contours or more or less elongated contours appear in the apparent resistivity images for the anisotropic targets; (3) the isotropic target embedded in the anisotropic host rock generates some radial patterns from the current injection point; (4) the anisotropy strike angles can be obtained from the symmetry axis of the apparent resistivity contours;.(5) multiple locations of current injections throughout the detection region are necessary for the surface pole-pole survey to avoid misleading data interpretation.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44877540","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}

引用次数: 0

Robust full-waveform inversion based on automatic differentiation and differentiable dynamic time warping 基于自动微分和可微动态时间规整的鲁棒全波形反演

IF 1.4 3区地球科学

Journal of Geophysics and Engineering Pub Date : 2023-04-18 DOI: 10.1093/jge/gxad029

Y. Liu, Jie Tang, Zhengwei Tang, Chengyu Sun

{"title":"Robust full-waveform inversion based on automatic differentiation and differentiable dynamic time warping","authors":"Y. Liu, Jie Tang, Zhengwei Tang, Chengyu Sun","doi":"10.1093/jge/gxad029","DOIUrl":"https://doi.org/10.1093/jge/gxad029","url":null,"abstract":"\u0000 Full waveform inversion is a methodology that determines high-resolution parameters. The widely used L2-norm misfit function has local minima if the low wavenumber components are not accurate. Suffering from cycle skipping problem, the solution of waveform inversion will be trapped in the local minima. Dynamic time warping aims to find an optimal alignment between two signals, which is a more robust measure to avoid cycle-skipping challenges. However, the discontinuity makes the conventional dynamic time warping distance unsuitable for waveform inversion. We introduce a soft dynamic time warping distance as the misfit function, which is differentiable that inverted solution can converge to the accurate global minimum. We compare the convexity of the L2-norm and soft dynamic time warping distance and show that the soft dynamic time warping distance has a wider convexity range with different time shift and amplitudes. It can alleviate the half-wavelength limitation of the conventional L2-norm. We calculate the gradient using the automatic differentiation technique and the minibatch strategy and then analyze the alignment paths of different smooth parameters. A significant smooth parameter γ makes the Soft-DTW distance tending to the L2-norm, which generates new local minima. We recommend a small smooth parameter to ensure the convexity of the Soft-DTW distance. Numerical examples show that the soft dynamic time warping can effectively reconstruct the deep velocity parameters of the BG Compass and Marmousi models with noise robustness and lower dependence on the initial model.","PeriodicalId":54820,"journal":{"name":"Journal of Geophysics and Engineering","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47956570","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}

引用次数: 0