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Keywords: low 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-2021-3583516
... on the quality of the data. Moving coil geophones, especially when used as a single sensor and at low frequency, introduce perturbations in the signal. We conclude that accelerometers are the better choice for single sensor broadband surveys. Which sensor for land nodal seismic: recording acceleration...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3584204
... A seismic vibrator’s ability to produce force at very low frequencies is severely limited by the fact that reaction mass acceleration is necessarily low at low frequencies. Manufacturers incrementally increase reaction mass size and stroke to improve low frequency output, but they reach...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3584163
... be processed with tools and methods that preserve and enhance the entire bandwidth with special consideration of the very low frequencies. Validation of those processes then needs to be made by careful and efficient quality control measures. In this paper we discuss methods of land seismic data processing...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3585845
... depending on Simultaneous source seismic surveys with dense 3D source the ranges of dither values and low frequencies to be grids provide excellent shot separation and amplitude separated. preservation, however, less dense ocean-bottom sensor and towed-streamer surveys present more of a separation...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594214
... A new pneumatic seismic source with a resonance frequency of 2.8 Hz has been built and tested during an OBN sea trial in the Gulf of Mexico. Data from the new source demonstrates that low frequency refracted signal can be recorded for offsets up to at least 45 km. The low frequency signal from...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594523
... Current emphasis on low frequencies increases the incentive to deal with seismic vibrator limitations (Ollivrin and Tellier, 2019). New servovalve technology improves seismic vibrator signal quality, especially at very low frequencies, such as 0.1 to 6 Hz. Third-generation pressure feedback...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581183
... Broadening the bandwidth of seismic data to a lower frequency can be very beneficial for seismic exploration. Conventional vibroseis are constrained, both mechanically and hydraulically, and as a result can transmit only limited force into the ground at low frequencies. Low-dwell vibroseis...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428087
... on extrapolated FWI (EFWI) by proposing to synthesize the low frequencies of multi-component elastic seismic records, and use those ”artificial” low frequencies to seed the frequency sweep of elastic FWI. By leveraging deep learning technologies, we separately train two neural networks to extrapolate the low...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3428270
... The absence of low frequencies in seismic data is a major roadblock to the inversion of low wavenumbers with full waveform inversion. We propose to use a recurrent convolutional neural network to denoise existing low frequencies and generate artificial ones from high frequency seismic data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3417492
...Low-frequency extrapolation using higher-frequency multi-channel prediction filters Stephen K Chiu*, In-Depth Geophysical Summary machine learning techniques led to a better understanding to the physics of the solution. We present a practical and effective method to extrapolate low frequencies...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427086
...Self-supervised learning for low frequency extension of seismic data Meixia Wang*, Sheng Xu, and Hongbo Zhou, Equinor US Operations Summary Traditional marine seismic datasets are acquired with towed streamer acquisition. The sea surface generates ghost effects Conventional towed streamer data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427285
...), AVO attributes (Ross and Kinman, 1995) and of quantify the noise, are oftentimes overlooked. Moreover, con- academic interest for the potential to observe non-linear wave tinuous time series facilitates access to low frequencies of the behavior. We show that multiscale analysis allows to char...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214978
... ABSTRACT Extending the seismic signal frequency towards the low frequencies has become almost standard on Vibroseis seismic projects, owing to the benefits it provides in terms of vertical resolution, signal penetration, inversion workflow results or ease of interpretation. However...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214929
... secondary source seg international exposition reservoir characterization dataset upstream oil & gas algorithm hybrid-radon transform workflow strong coherent noise receiver domain low frequency nonuniform vibroseis source frequency land vibroseis data ground roll Campman , X...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216260
... include a change in the coda, a strong amplitude loss at low frequencies, a moderate increase at high frequencies, and the appearance of a spectral notch. To explain these, rather than appealing to linear elastic wave theory coupled with rather contrived levels of added heterogeneity, we point out...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216761
... of WAZ data when using this data driven approach to update the salt model. Presentation Date: Tuesday, September 17, 2019 Session Start Time: 8:30 AM Presentation Time: 10:35 AM Location: 302B Presentation Type: Oral salt model model building upstream oil & gas low frequency...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-W6-01
... ratio. The benefits of including PS and SS data in addition to PP data for seismic reservoir characterization through elastic inversion are illustrated on a synthetic dataset. information inversion ss data amplitude only low frequency traveltime inversion result upstream oil & gas...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3197987
... ABSTRACT Computational low frequency extrapolation is in principle the most direct way to address the cycle skipping problem in full waveform inversion (FWI). We propose a method of extrapolated full waveform inversion (EFWI), where FWI is allowed to make use of data augmented by increasing...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3208563
... shear waves with different velocity can be found and they are irrelevant to the source directions. Moreover, an empirical formula to approximately estimate the low frequency fast and slow flexural wave velocity and the equivalent anisotropy magnitude is developed. The formula is tested to conform its...

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