Applied Geophysics

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Reduction of distortion and improvement of efficiency for gridding of scattered gravity and magnetic data
Applied Geophysics - Tập 9 - Trang 378-390 - 2012
Chen Zhang, Chang-Li Yao, Yong-Mao Xie, Yuan-Man Zheng, Hu-Liang Guan, Dong-Ming Hong
This paper presents a reasonable gridding-parameters extraction method for setting the optimal interpolation nodes in the gridding of scattered observed data. The method can extract optimized gridding parameters based on the distribution of features in raw data. Modeling analysis proves that distortion caused by gridding can be greatly reduced when using such parameters. We also present some impro...... hiện toàn bộ
Velocity dispersion and fluid substitution in sandstone under partially saturated conditions
Applied Geophysics - Tập 15 - Trang 188-196 - 2018
Xiao-Yi Ma, Shang-Xu Wang, Jian-Guo Zhao, Han-Jun Yin, Li-Ming Zhao
The elastic moduli of four sandstone samples are measured at seismic (2−2000 Hz) and ultrasonic (1 MHz) frequencies and water- and glycerin-saturated conditions. We observe that the high-permeability samples under partially water-saturated conditions and the low-permeability samples under partially glycerin-saturated conditions show little dispersion at low frequencies (2−2000 Hz). However, the hi...... hiện toàn bộ
Amplitude-preserving plane-wave prestack time migration for AVO analysis
Applied Geophysics - Tập 5 - Trang 212-218 - 2008
Di Wang, Xiaodong Zheng, Jiubing Cheng, Huazhong Wang, Zaitian Ma
To support amplitude variation with offset (AVO) analysis in complex structure areas, we introduce an amplitude-preserving plane-wave prestack time migration approach based on the double-square-root wave equation in media with little lateral velocity variation. In its implementation, a data mapping algorithm is used to obtain offset-plane-wave data sets from the common-midpoint gathers followed by...... hiện toàn bộ
Forward modeling of marine DC resistivity method for a layered anisotropic earth
Applied Geophysics - Tập 13 - Trang 279-287 - 2016
Chang-Chun Yin, Ping Zhang, Jing Cai
Since the ocean bottom is a sedimentary environment wherein stratification is well developed, the use of an anisotropic model is best for studying its geology. Beginning with Maxwell’s equations for an anisotropic model, we introduce scalar potentials based on the divergence-free characteristic of the electric and magnetic (EM) fields. We then continue the EM fields down into the deep earth and up...... hiện toàn bộ
Research on fault recognition method combining 3D Res-UNet and knowledge distillation
Applied Geophysics - Tập 18 Số 2 - Trang 199-212 - 2021
Jing Wang, Junhua Zhang, Jialiang Zhang, Fengming Lu, Rui-Gang Meng, Zuoqian Wang
An improved convolution perfectly matched layer for elastic second-order wave equation
Applied Geophysics - Tập 18 - Trang 317-330 - 2022
Ling-Yun Yang, Guo-Chen Wu, Qing-Yang Li, Zhan-Yuan Liang
A convolution perfectly matched layer (CPML) can efficiently absorb boundary reflection in numerical simulation. However, the CPML is suitable for the first-order elastic wave equation and is difficult to apply directly to the second-order elastic wave equation. In view of this, based on the first-order CPML absorbing boundary condition, we propose a new CPML (NCPML) boundary which can be directly...... hiện toàn bộ
Tomographic velocity inversion for ADCIGs in areas with a rugged surface
Applied Geophysics - Tập 9 - Trang 313-318 - 2012
Kai Zhang, Zhen-Chun Li, Tong-Sheng Zeng, Ning Qin, Yun-Xia Yao
Pre-stack depth migration velocity analysis is one of the key techniques influencing image quality. As for areas with a rugged surface and complex subsurface, conventional prestack depth migration velocity analysis corrects the rugged surface to a known datum or designed surface velocity model on which to perform migration and update the velocity. We propose a rugged surface tomographic velocity i...... hiện toàn bộ
Acoustic impedance inversion of zero-offset VSP data
Applied Geophysics - Tập 6 - Trang 150-158 - 2009
Jing Wang, Yang Liu, Zhe Sun, Hong Tian, Hua Su, Qianhua Zhao, Yingyu Liu
Highly precise acoustic impedance inversion is a key technology for pre-drilling prediction by VSP data. In this paper, based on the facts that VSP data has high resolution, high signal to noise ratio, and the downgoing and upgoing waves can be accurately separated, we propose a method of predicting the impedance below the borehole in front of the bit using VSP data. First, the method of nonlinear...... hiện toàn bộ
Topographic effects on long offset transient electromagnetic response
Applied Geophysics - Tập 8 - Trang 277-284 - 2011
Xin-Gong Tang, Wen-Bao Hu, Liang-Jun Yan
The forward modeling procedure used in this article is formulated with the volume integral equation based on the tensor Green’s function. The electromagnetic components responses are first calculated in the frequency domain and then transformed to the time domain by digital filtering. The valley and hill topography with a layered earth is stimulated by a horizontal electric dipole (HED) transmitte...... hiện toàn bộ
Deformation mechanism and treatment technology research of coal pillars in acute inclined goafs under expressway
Applied Geophysics - - Trang 1-15 - 2023
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 g...... hiện toàn bộ
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