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Keywords: frequency
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Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594656
... around the underground coal mine roadway, we use 3D finite-difference simulations. Modelling confirmed that the roadway mode in the horizontal plane in the center of the seam and for higher frequencies strives to the fundamental mode of the Rayleigh tunnel surface wave in the coal layer. Therefore, the S...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3578786
... The theory of calculus shows that the wavelet is stretched after integration, the effective frequency moves to low frequency, and the wavelet is compressed after differentiation. With the increase of differential order, the dominant frequency and effective frequency shift to high frequency...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594545
... between two neighboring frequency peaks. Therefore, with only one geophone near the HSR, we propose one robust HST speed estimating method by computing an auto-correlation function of the received signal’s amplitude spectrum. The advantage of the proposed method is its robustness, low computation cost...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594666
... Time-domain inversion employs frequencies from a finite frequency-band wavelet to propagate seismic waves via a numerical approach. However, the classical time-domain FWI has been confined by the magnitude distribution of each frequency in a wavelet, resulting in an apparent “wavelet effect...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594558
... at the boundary. This requirement translates into a vanishing relative motion of the fluid with respect to the solid-frame, i.e., filtration field, at the contact. Nevertheless, our analysis shows that for the Biot theory, in the low-frequency regime, a non-zero, although insignificantly small, filtration field...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594526
... is frequency domain, has been proposed to attenuate ground to decompose the input data into eigenimages with SVD, roll. The key concept is to construct a noise model from where a few eigenimages that correspond to the largest eigenimages and remove it from input data. The main task is eigenvalues are selected...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594814
... Local seismic attributes play an important role in seismic processing and interpretation. In this abstract, we present an efficient method for estimating local seismic attributes, including local frequency and local spectrum, using streaming computation. In our proposed approach, the local...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594792
... Zealand. decision tree learning applied geoscience machine learning upstream oil & gas artificial intelligence seismic data reservoir characterization frequency prediction random forest green line new zealand random forest prediction acoustic impedance subsurface property...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580872
... different lithofacies to one single class and balancing the predictions accordingly with the class frequencies. The second was related to the contest metric. It did not consider the imbalanced classes. In fact, the most sampled classes, like the shale, which corresponded to 62% of the observations, were...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580742
... recordings in the North Sea. We describe a vibrator tow depth optimization approach based on the minimum achievable frequency and sweep length and design low- and high-frequency sweeps covering the 3– 125 Hz band. upstream oil & gas stealth test exploration geophysicist 10 spectrum frequency...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580563
... the prediction to the vicinity of the actual multiples in terms of both frequency and slope. This abstract introduces a preconditioning method via 2D matched filtering in the curvelet domain, which matches the predicted multiple model with the true multiple in space, frequency and local slope. Synthetic and real...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580913
...-Cheng’s, and self-consistent scheme. The results obtained with different methods are compared and applicability of each method for calculating the effective properties of fractured rocks is discussed. Specifically, it is shown that the Eshelby-Cheng method cannot be applied for the low-frequency fluid...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581021
... circular shot OBN acquisition. In our implementation of FWI in the frequency domain, we explore three strategies to partition the range of frequencies to achieve an optimal inversion, and conclude that a partition into four sequential sets of frequencies provides the best cost/benefit solution. We find...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580679
..., a data example from offshore Malaysia will be shown. The acoustic signals generated by the seismic vessel have been estimated from recorded hydrophone data. This estimation is limited to frequencies above 30 Hz since non-acoustic noise dominates over the weak acoustic signals generated by the vessel...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581815
... under the constraint into Wheeler domain. Seismic data is unfolded in the of log sequence. First of all, seismic data is converted into frequency domain to generate the time-frequency feature relative impedance. Upon completion of seismic reflection chart. Both the Wheeler chart and the time-frequency...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581846
... Land seismic data are challenging for reliable seismic imaging. Even after extensive processing, desired reflections may remain weak. We present a new approach combining the seismic time-frequency masking with the minimum statistic approach to extract weak reflections from noisy data. Initial...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581364
... by our method is the outermost wave field component in the spherical wave field ensures that, if the chosen angular frequency, min , synthesized by the two-way wave. This wave field corresponds to the minimum frequency of the seismic data component can be described more accurately with our bandwidth...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3595017
... resonance in the pipe which radiates energy back to the surface. Accordingly, we performed several experiments with different sources and sensors placed inside and outside of the pipe, and compare their frequency spectra with theoretical acoustic modes. The test results confirmed that the acoustic modes...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3595028
... frequency applied geoscience microseismic data reservoir characterization sichuan basin chengdu university exploration geophysicist 10 reservoir geomechanics azimuth value microseismic event histogram fracture in-situ stress azimuth upstream oil & gas curvature horizontal...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3582997
... frequency extraction application gas sand applied geoscience order term amplitude gas saturation reservoir characterization frequency band geophysics saturation interface upstream oil & gas frequency-dependent avo exploration geophysicist 10 thin-bed mapping douglas foster...

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