Applied Geophysics

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Property identification of anomalous seismic bodies by GMES techniques, a case history
Applied Geophysics - Tập 2 - Trang 135-139 - 2005
Yunxiang Liu, Weibin Sun, Dechun Li, Xiaofang Xu
What are the anomalous seismic reflection bodies at depths of over 6000 m? Are they reefs or igneous rock? This is a difficult problem for seismic techniques, but the GMES technique can handle it. The GMES technique is a joint exploration technique combining gravity, magnetic, electrical, and seismic techniques. The specific procedure is to conduct a 2D interface-constrained CEMP inversion using 2...... hiện toàn bộ
Irregular surface seismic forward modeling by a body-fitted rotated–staggered-grid finite-difference method
Applied Geophysics - Tập 15 Số 3 - Trang 420-431 - 2018
Cheng, Jing-Wang, Fan, Na, Zhang, You-Yuan, Lü, Xiao-Chun
Finite-difference (FD) methods are widely used in seismic forward modeling owing to their computational efficiency but are not readily applicable to irregular topographies. Thus, several FD methods based on the transformation to curvilinear coordinates using body-fitted grids have been proposed, e.g., stand staggered grid (SSG) with interpolation, nonstaggered grid, rotated staggered grid (RSG), a...... hiện toàn bộ
A three-dimensional transient electromagnetic data inversion method based on a time—frequency transformation
Applied Geophysics - Tập 17 - Trang 361-376 - 2021
Yun-Jian Yang, Xu-Ben Wang, Xue-Jun Liu, Xiao-Li Mi, Lifeng Mao
Herein, a three-dimensional (3D) inversion method in the frequency domain based on a time–frequency transformation was developed to improve the efficiency of the 3D inversion of transient electromagnetic (TEM) data. The Fourier transform related to the electromagnetic response in the frequency and time domains becomes a sine or cosine transform under the excitation of downward-step current. We est...... hiện toàn bộ
An analysis of seismic scattering attenuation in a random elastic medium
Applied Geophysics - Tập 8 - Trang 344-354 - 2011
Jiong Liu, Xiu-Cheng Wei, Yu-Xin Ji, Tian-Sheng Chen, Chun-Yuan Liu, Chun-Tao Zhang, Ming-Gang Dai
Seismic attenuation has been an interesting topic of research, for it reflects the inherent media characteristics in which seismic waves propagate. There are many factors that cause seismic wave attenuation, such as geometry attenuation caused by energy dissipating during propagation, friction attenuation by relative sliding among rock grains, and scattering attenuation by rock heterogeneity. In t...... hiện toàn bộ
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
Least-squares reverse time migration method using the factorization of the Hessian matrix
Applied Geophysics - Tập 18 Số 1 - Trang 94-100 - 2021
Xuewen Sun, Houhua Teng, Ling Ren, Weiqi Wang, Zhenchun Li
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
Seismic data reconstruction based on CS and Fourier theory
Applied Geophysics - Tập 10 - Trang 170-180 - 2013
Hua Zhang, Xiao-Hong Chen, Xin-Min Wu
Traditional seismic data sampling follows the Nyquist sampling theorem. In this paper, we introduce the theory of compressive sensing (CS), breaking through the limitations of the traditional Nyquist sampling theorem, rendering the coherent aliases of regular undersampling into harmless incoherent random noise using random undersampling, and effectively turning the reconstruction problem into a mu...... hiện toàn bộ
Full tensor gravity gradiometry data inversion: Performance analysis of parallel computing algorithms
Applied Geophysics - Tập 12 - Trang 292-302 - 2015
Zhen-Long Hou, Xiao-Hui Wei, Da-Nian Huang, Xu Sun
We apply reweighted inversion focusing to full tensor gravity gradiometry data using message-passing interface (MPI) and compute unified device architecture (CUDA) parallel computing algorithms, and then combine MPI with CUDA to formulate a hybrid algorithm. Parallel computing performance metrics are introduced to analyze and compare the performance of the algorithms. We summarize the rules for th...... hiện toàn bộ
Tổng số: 705   
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