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Frequency Controllable Envelope Operator and Its Application in Multiscale Full-Waveform Inversion EI Scopus SCIE
期刊论文 | 2019 , 57 (2) , 683-699 | IEEE Transactions on Geoscience and Remote Sensing
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Abstract :

Full-waveform inversion (FWI) attempts to find optimal models of subsurface by using full information of the observed data. One difficulty in conventional FWI is that the misfit function has many local minima because of cycle skipping. Envelope inversion (EI), which uses the envelope operator (EO)-based misfit function, has been proven to be effective in mitigating cycle skipping and recovering long-wavelength velocity model. However, EI ignores the fact that the information within different frequency bands plays different roles in inversion. In this paper, a frequency controllable EO, which can control the frequency components being used to construct envelope, is proposed. We propose a new misfit function and a multiscale FWI method. Using synthetic experiments based on the Marmousi model, we demonstrate that the proposed method is better than EI in mitigating cycle skipping and in building an accurate initial model for conventional FWI to significantly improve its final result. In addition, this method can tolerate a wide range of noise levels. Its effectiveness has also been successfully demonstrated using a field data set. IEEE

Keyword :

Cycle skipping Different frequency Frequency components frequency controllable envelope operator (FCEO) Full informations Full-waveform inversion Multiscale schemes Synthetic experiments

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GB/T 7714 Gao, Zhaoqi , Pan, Zhibin , Gao, Jinghuai et al. Frequency Controllable Envelope Operator and Its Application in Multiscale Full-Waveform Inversion [J]. | IEEE Transactions on Geoscience and Remote Sensing , 2019 , 57 (2) : 683-699 .
MLA Gao, Zhaoqi et al. "Frequency Controllable Envelope Operator and Its Application in Multiscale Full-Waveform Inversion" . | IEEE Transactions on Geoscience and Remote Sensing 57 . 2 (2019) : 683-699 .
APA Gao, Zhaoqi , Pan, Zhibin , Gao, Jinghuai , Wu, Ru-Shan . Frequency Controllable Envelope Operator and Its Application in Multiscale Full-Waveform Inversion . | IEEE Transactions on Geoscience and Remote Sensing , 2019 , 57 (2) , 683-699 .
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MCA-Based Clutter Reduction From Migrated GPR Data of Shallowly Buried Point Target EI Scopus SCIE
期刊论文 | 2019 , 57 (1) , 432-448 | IEEE Transactions on Geoscience and Remote Sensing
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Abstract :

Reducing clutter is an important process in terms of improving the detection of targets when using ground penetrating radar (GPR), especially in the case of overlapping target responses and clutter. We present an alternative scheme to remove clutter from monostatic GPR data by combining migration and morphology component analysis (MCA). A simple phase shift migration is first performed on received B-scan data. In the migrated B-scan, clutter, and useful target responses exhibit different morphologies. The clutter appears to be horizontal stripes and the hyperbolic reflection from the target is refocused into an enhanced point-like shape. Subsequently, an overcomplete dictionary is constructed to discriminatively and sparsely represent each morphology based on the simulated GPR data. In particular, the 2-D undecimated discrete wavelet transform is used for the target component, and the 2-D curvelet atoms are used for the clutter. Then, the MCA technique is exploited to sparsely separate the two different components, which leads to the clutter reduction. The sparse representation of 2-D finite-difference-time-domain-based synthetic GPR data illustrates the validity of the overcomplete dictionary. In this paper, the proposed clutter removal method is tested on a synthetic model of point-like targets and real data from buried landmines. The migration concentrates the refracted signals from landmines to their origins, and the shapes of the landmines can be clearly defined. The results of the clutter reduction suggest that the proposed method is more effective than the method implemented directly on the B-scan data and the traditional mean subtraction. IEEE

Keyword :

Clutter Reduction Component analysis Ground Penetrating Radar migration Over-complete dictionaries Shape Sparse representation

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GB/T 7714 Zhou, Yanhui , Chen, Wenchao . MCA-Based Clutter Reduction From Migrated GPR Data of Shallowly Buried Point Target [J]. | IEEE Transactions on Geoscience and Remote Sensing , 2019 , 57 (1) : 432-448 .
MLA Zhou, Yanhui et al. "MCA-Based Clutter Reduction From Migrated GPR Data of Shallowly Buried Point Target" . | IEEE Transactions on Geoscience and Remote Sensing 57 . 1 (2019) : 432-448 .
APA Zhou, Yanhui , Chen, Wenchao . MCA-Based Clutter Reduction From Migrated GPR Data of Shallowly Buried Point Target . | IEEE Transactions on Geoscience and Remote Sensing , 2019 , 57 (1) , 432-448 .
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On the method of multidimensional Q-factor and velocity inversion with VSP data EI
会议论文 | 2019 , 5123-5128 | Society of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013
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Abstract :

Based on the theory of one-way wave propagation in a 1-D viscoelastic medium, we propose an inversion method to estimate the Q-factor and velocity using the Gauss-Newton method. To speed up the computation, we derive an analytic expression of the Jacobi matrix. As the forward simulation is one of the base steps of the inversion problem, we derived the transfer matrix to simulate the forward model with direct downgoing wave and primary reflection (upgoing wave) of zero-offset VSP data. We give the workflow of both the forward and inversion method, and discuss the optimum initial value determination. Test on synthetic VSP data shows that the proposed method doesn't need a priori information of interfaces positions and can eliminates the influence of upgoing wave at the interfaces. By applying to field VSP data, we obtained Q and velocity curves which have almost the same distribution as that obtained from a known well. It's a powerful tool to predict potential high productivity gas well. © 2013 SEG SEG Houston 2013 Annual Meeting.

Keyword :

Analytic expressions Forward simulation Gauss-Newton methods Inversion problems Priori information Value determination Velocity inversion Visco-elastic mediums

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GB/T 7714 Zhao, Jing , Gao, Jinghuai , Li, Qiang . On the method of multidimensional Q-factor and velocity inversion with VSP data [C] . 2019 : 5123-5128 .
MLA Zhao, Jing et al. "On the method of multidimensional Q-factor and velocity inversion with VSP data" . (2019) : 5123-5128 .
APA Zhao, Jing , Gao, Jinghuai , Li, Qiang . On the method of multidimensional Q-factor and velocity inversion with VSP data . (2019) : 5123-5128 .
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Time-Frequency Analysis of Seismic Data Using a Three Parameters S Transform EI SCIE Scopus
期刊论文 | 2018 , 15 (1) , 142-146 | IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
SCOPUS Cited Count: 2
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Abstract :

The S transform (ST) is one of the most commonly used time-frequency (TF) analysis algorithms and is commonly used in assisting reservoir characterization and hydrocarbon detection. Unfortunately, the TF spectrum obtained by the ST has a low temporal resolution at low frequencies, which lowers its ability in thin beds and channels detection. In this letter, we propose a three parameters ST (TPST) to optimize the TF resolution flexibly. To demonstrate the validity and effectiveness of the TPST, we first apply it to a synthetic data and a synthetic seismic trace and then to a filed data. Synthetic data examples show that this TPST achieves an optimized TF resolution, compared with the standard ST and modified ST with two parameters. Field data experiments illustrate that the TPST is superior to the ST in highlighting the channel edges. The lateral continuity of the frequency slice produced by the TPST is more continuous than that of the ST.

Keyword :

three parameters S transform (TPST) seismic time-frequency (TF) analysis S transform (ST)

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GB/T 7714 Liu, Naihao , Gao, Jinghuai , Zhang, Bo et al. Time-Frequency Analysis of Seismic Data Using a Three Parameters S Transform [J]. | IEEE GEOSCIENCE AND REMOTE SENSING LETTERS , 2018 , 15 (1) : 142-146 .
MLA Liu, Naihao et al. "Time-Frequency Analysis of Seismic Data Using a Three Parameters S Transform" . | IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 15 . 1 (2018) : 142-146 .
APA Liu, Naihao , Gao, Jinghuai , Zhang, Bo , Li, Fangyu , Wang, Qian . Time-Frequency Analysis of Seismic Data Using a Three Parameters S Transform . | IEEE GEOSCIENCE AND REMOTE SENSING LETTERS , 2018 , 15 (1) , 142-146 .
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Variable-Order Finite Difference Scheme for Numerical Simulation in 3-D Poroelastic Media EI SCIE Scopus
期刊论文 | 2018 , 56 (5) , 2991-3001 | IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
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Abstract :

The numerical simulation of wave fields in 3-D poroelastic media can give a better understanding of elastic properties, deformation characteristics of rocks, and interaction with pore fluids. However, the wave equations in 3-D poroelastic media include more equations, and the size of geophysical model for practical reservoir is immense. Therefore, numerical simulation is time consuming. In order to improve the efficiency, we proposed variable-order staggered-grid (SG) finite difference (FD) method to solve 3-D poroelastic wave equations. In this method, different orders of SGFD scheme can be selected for different velocities in a heterogeneous poroelastic model by restricting the dispersion parameters within a tolerable threshold. We derive the dispersion relation, numerical dispersion relation, and stability condition for 3-D poroelastic media using plane wave analysis and SGFD scheme. Based on the numerical dispersion relation of slow P-wave, S-wave, and fast P-wave, we restrict the average of dispersion parameters of the three waves within a given range; the orders of the SGFD scheme can be calculated for different velocities. Dispersion analysis shows that the variable-order SGFD method can maintain the accuracy compared with the fixed-order SGFD method. We use three numerical examples, which include laterally homogeneous model, a simplified overthrust model, and a geophysical model in a desert area in China, to demonstrate the accuracy and efficiency of the proposed method. The numerical results confirm that the variable-order SGFD method can reduce the computation time efficiently and still ensure the accuracy.

Keyword :

finite difference (FD) poroelastic media 3-D variable order dispersion relationship

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GB/T 7714 Zhang, Yijie , Gao, Jinghuai , Peng, Jigen . Variable-Order Finite Difference Scheme for Numerical Simulation in 3-D Poroelastic Media [J]. | IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING , 2018 , 56 (5) : 2991-3001 .
MLA Zhang, Yijie et al. "Variable-Order Finite Difference Scheme for Numerical Simulation in 3-D Poroelastic Media" . | IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 56 . 5 (2018) : 2991-3001 .
APA Zhang, Yijie , Gao, Jinghuai , Peng, Jigen . Variable-Order Finite Difference Scheme for Numerical Simulation in 3-D Poroelastic Media . | IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING , 2018 , 56 (5) , 2991-3001 .
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A frequency-domain seismic blind deconvolution based on Gini correlations SCIE Scopus
期刊论文 | 2018 , 15 (1) | JOURNAL OF GEOPHYSICS AND ENGINEERING
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Abstract :

In reflection seismic processing, the seismic blind deconvolution is a challenging problem, especially when the signal-to-noise ratio (SNR) of the seismic record is low and the length of the seismic record is short. As a solution to this ill-posed inverse problem, we assume that the reflectivity sequence is independent and identically distributed (i.i.d.). To infer the i.i.d. relationships from seismic data, we first introduce the Gini correlations (GCs) to construct a new criterion for the seismic blind deconvolution in the frequency-domain. Due to a unique feature, the GCs are robust in their higher tolerance of the low SNR data and less dependent on record length. Applications of the seismic blind deconvolution based on the GCs show their capacity in estimating the unknown seismic wavelet and the reflectivity sequence, whatever synthetic traces or field data, even with low SNR and short sample record.

Keyword :

inverse filter reflectivity sequence Gini correlations seismic wavelet blind deconvolution

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GB/T 7714 Wang, Zhiguo , Zhang, Bing , Gao, Jinghuai et al. A frequency-domain seismic blind deconvolution based on Gini correlations [J]. | JOURNAL OF GEOPHYSICS AND ENGINEERING , 2018 , 15 (1) .
MLA Wang, Zhiguo et al. "A frequency-domain seismic blind deconvolution based on Gini correlations" . | JOURNAL OF GEOPHYSICS AND ENGINEERING 15 . 1 (2018) .
APA Wang, Zhiguo , Zhang, Bing , Gao, Jinghuai , Liu, Qing Huo . A frequency-domain seismic blind deconvolution based on Gini correlations . | JOURNAL OF GEOPHYSICS AND ENGINEERING , 2018 , 15 (1) .
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Mini-batch optimized full waveform inversion with geological constrained gradient filtering EI SCIE Scopus
期刊论文 | 2018 , 152 , 9-16 | JOURNAL OF APPLIED GEOPHYSICS
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Abstract :

High computation cost and generating solutions without geological sense have hindered the wide application of Full Waveform Inversion (FWI). Source encoding technique is a way to dramatically reduce the cost of FWI but subject to fix-spread acquisition setup requirement and slow convergence for the suppression of cross-talk. Traditionally, gradient regularization or preconditioning is applied to mitigate the ill-posedness. An isotropic smoothing filter applied on gradients generally gives non-geological inversion results, and could also introduce artifacts. In this work, we propose to address both the efficiency and ill-posedness of FWI by a geological constrained mini batch gradient optimization method. The mini batch gradient descent optimization is adopted to reduce the computation time by choosing a subset of entire shots for each iteration. By jointly applying the structure-oriented smoothing to the mini-batch gradient, the inversion converges faster and gives results with more geological meaning. Stylized Marmousi model is used to show the performance of the proposed method on realistic synthetic model. (C) 2018 Elsevier B.V. All rights reserved.

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GB/T 7714 Yang, Hui , Jia, Junxiong , Wu, Bangyu et al. Mini-batch optimized full waveform inversion with geological constrained gradient filtering [J]. | JOURNAL OF APPLIED GEOPHYSICS , 2018 , 152 : 9-16 .
MLA Yang, Hui et al. "Mini-batch optimized full waveform inversion with geological constrained gradient filtering" . | JOURNAL OF APPLIED GEOPHYSICS 152 (2018) : 9-16 .
APA Yang, Hui , Jia, Junxiong , Wu, Bangyu , Gao, Jinghuai . Mini-batch optimized full waveform inversion with geological constrained gradient filtering . | JOURNAL OF APPLIED GEOPHYSICS , 2018 , 152 , 9-16 .
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Frequency-dependent reflections in elastic diffusive-viscous media SCIE Scopus
期刊论文 | 2018 , 15 (5) , 1900-1916 | JOURNAL OF GEOPHYSICS AND ENGINEERING
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Abstract :

Amplitude variation with offset/angle of incidence (AVO/AVA) analysis is essential for hydrocarbon detection and reservoir characterization. Frequency-dependent AVO analysis plays an important role in seismic interpretation especially for the low-frequency seismic anomalies related to hydrocarbon reservoir. The diffusive-viscous model is used to explain these anomalies, but it does not consider the shear effects of rocks. In this work, we firstly extend the diffusiveviscous model to elastic case based on the mechanisms in a macroscopic porous medium. The elastic diffusive-viscous model describes attenuation of compressional and shear waves in a fluid-saturated medium and it reduces to the classic elastic wave equation in a special case. Then, we investigate the properties of reflection/transmission coefficients at an interface between two different elastic diffusive-viscous media. The reflection/transmission coefficients not only relate to the parameters of the media but also depend on the frequency. Two examples are given to analyze the dependence of the reflection/transmission coefficients on the frequency and incident angle at interfaces between gas-saturated sandstone and brine-saturated shale and between brinesaturated shale and oil-saturated sandstone. The results show that the magnitudes and phase angles of the reflection/transmission coefficients are significantly dependent on the frequency at lower frequency (<20 Hz). Finally, we apply the frequency-dependent reflection/transmission coefficients to the extended reflectivity method to model the propagation of the elastic diffusiveviscous wave in a layered medium. The modeling results show that the diffusive-viscous wave has strong amplitude attenuation and phase shift compared with those of elastic wave when the wave propagates across fluid-saturated layers.

Keyword :

attenuation wave propagation reflection/transmission coefficient frequency-dependent

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GB/T 7714 Zhao, Haixia , Gao, Jinghuai , Peng, Jigen . Frequency-dependent reflections in elastic diffusive-viscous media [J]. | JOURNAL OF GEOPHYSICS AND ENGINEERING , 2018 , 15 (5) : 1900-1916 .
MLA Zhao, Haixia et al. "Frequency-dependent reflections in elastic diffusive-viscous media" . | JOURNAL OF GEOPHYSICS AND ENGINEERING 15 . 5 (2018) : 1900-1916 .
APA Zhao, Haixia , Gao, Jinghuai , Peng, Jigen . Frequency-dependent reflections in elastic diffusive-viscous media . | JOURNAL OF GEOPHYSICS AND ENGINEERING , 2018 , 15 (5) , 1900-1916 .
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Seismic attenuation estimation using the modified log spectral ratio method EI Scopus SCIE
期刊论文 | 2018 , 159 , 386-394 | Journal of Applied Geophysics
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The quality factor Q is one of the key parameters in designing an inverse Q filter to improve seismic time resolution and used a direct hydrocarbon indicator. In this paper, we propose a modified log spectral ratio (MLSR) method to estimate the quality factor from seismic CMP gathers. Our workflow assumes that the source wavelet can be simulated by a mixed phase wavelet (MPW). We first deduce a modified log spectral ratio (MLSR) method to estimate the quality factor from seismic CMP gathers. We next obtain the quality factor by comparing the ratio of log spectral of different offsets within the same CMP gather. To demonstrate the effectiveness and robustness of the proposed method, we first apply it to synthetic gathers and then a real seismic data to estimate the quality factor Q. Both applications illustrate that the Q quality factor estimated using our method is superior to that obtained from the selected comparing methods. © 2018

Keyword :

CMP gathers Mixed phase Pre-stack Quality factors Spectral ratios

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GB/T 7714 Liu, Naihao , Zhang, Bo , Gao, Jinghuai et al. Seismic attenuation estimation using the modified log spectral ratio method [J]. | Journal of Applied Geophysics , 2018 , 159 : 386-394 .
MLA Liu, Naihao et al. "Seismic attenuation estimation using the modified log spectral ratio method" . | Journal of Applied Geophysics 159 (2018) : 386-394 .
APA Liu, Naihao , Zhang, Bo , Gao, Jinghuai , Gao, Zhaoqi , Li, Shengjun . Seismic attenuation estimation using the modified log spectral ratio method . | Journal of Applied Geophysics , 2018 , 159 , 386-394 .
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Properties of seismic absorption induced reflections EI SCIE Scopus
期刊论文 | 2018 , 152 , 118-128 | JOURNAL OF APPLIED GEOPHYSICS
SCOPUS Cited Count: 1
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Abstract :

Seismic reflections at an interface are often regarded as the variation of the acoustic impedance (product of seismic velocity and density) in a medium. In fact, they can also be generated due to the difference in absorption of the seismic energy. In this paper, we investigate the properties of such reflections. Based on the diffusive-viscous wave equation and elastic diffusive-viscous wave equation, we investigate the dependency of the reflection coefficients on frequency, and their variations with incident angles. Numerical results at a boundary due to absorption contrasts are compared with those resulted from acoustic impedance variation. It is found that, the reflection coefficients resulted from absorption depend significantly on the frequency especially at lower frequencies, but vary very slowly at small incident angles. At the higher frequencies, the reflection coefficients of diffusive-viscous wave and elastic diffusive-viscous wave are close to those of acoustic and elastic cases, respectively. On the other hand, the reflections caused by acoustic impedance variation are independent of frequency but vary distinctly with incident angles before the critical angle. We also investigate the difference between the seismograms generated in the two different media. The numerical results show that the amplitudes of these reflected waves are attenuated and their phases are shifted. However, the reflections obtained by acoustic impedance contrast, show no significant amplitude attenuation and phase shift. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Absorption Numerical modeling Frequency-dependent Seismic reflections Acoustic impedance

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GB/T 7714 Zhao, Haixia , Gao, Jinghuai , Peng, Jigen . Properties of seismic absorption induced reflections [J]. | JOURNAL OF APPLIED GEOPHYSICS , 2018 , 152 : 118-128 .
MLA Zhao, Haixia et al. "Properties of seismic absorption induced reflections" . | JOURNAL OF APPLIED GEOPHYSICS 152 (2018) : 118-128 .
APA Zhao, Haixia , Gao, Jinghuai , Peng, Jigen . Properties of seismic absorption induced reflections . | JOURNAL OF APPLIED GEOPHYSICS , 2018 , 152 , 118-128 .
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