The use of pseudorandom sweeps for vibroseis acquisition

Dean, Tim; Tulett, John; Lane, Darvin

doi:10.3997/1365-2397.35.1.87388

Cited by 7 publications

(3 citation statements)

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“…This concept allows non-uniform sampling and non-patterned shooting and promotes robotized acquisition using autonomous sources and receivers (seismic Besides, in the time dimension, 'various signaturing' is a concept in which every shot in the blended-source array is encoded with its own signature and emits the distinguishable wavefields. See, for example, high fidelity vibratory seismic (HFVS, Allen et al, 1998), independent simultaneous sourcing (ISS, Howe et al, 2008) and pseudo-random sweeping (Dean, 2014;Dean et al, 2017) for land acquisition and popcorn shooting (Abma & Ross, 2013), shot repetition (Wu et al, 2015) and near-orthogonal firing sequences (Mueller et al, 2016) for marine. Sweeping is applicable also for marine by using marine vibrators.…”

Section: Concept and Methodsmentioning

confidence: 99%

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: Concept and method

Ishiyama

2023

Geophysical Prospecting

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We introduce a blended‐acquisition method: temporally signatured and/or modulated and spatially dispersed source array. The former, signatured and dispersed source array, has much less constraints in the encoding with operational flexibility, allowing non‐uniform sampling and non‐patterned shooting both in the space and time dimension. The latter, modulated and dispersed source array, allows straightforward deblending by filtering and physically separating frequency channels in the frequency domain. We demonstrate our method by synthesizing the blended acquisition followed by deblended‐data‐reconstruction processing in order to discuss the virtues. The examples show that this method could make the blended‐acquisition encoding and operations indeed simple and robust; the same is true for the deblending processing.This article is protected by copyright. All rights reserved

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Section: Concept and Methodsmentioning

confidence: 99%

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: Concept and method

Ishiyama

2023

Geophysical Prospecting

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“…It was designed to produce signals at frequencies between 5 and 100 Hz and includes an adaptive, in-line, compensation filter that uses acceleration data at the piston assembly for gain control (along with other controller technology) to reduce sound levels at frequencies outside the desired frequency band [25]. In general, three signal types are possible from MV elements: linear frequency sweeps, logarithmic frequency sweeps [26], and pseudorandom noise (PRN) [27][28][29][30][31].…”

Section: Sources Levels Marine Vibroseis (Mv)mentioning

confidence: 99%

“…Harmonics were added to the synthetic MV signal based on the progression of a damped harmonic oscillator whose amplitude decreased linearly with time and exponentially with harmonic order. For this study, the amplitude of the source waveform of one MV element was set to 5 kPa (zero-to-peak source level (SLPK) [34] of 194 dB re 1 µ Pa m), resulting in an energy source spectral density level (ESSL) [35] In general, three signal types are possible from MV elements: linear frequency sweeps, logarithmic frequency sweeps [26], and pseudorandom noise (PRN) [27][28][29][30][31]. Here, we studied the most common signal type, a linear frequency upsweep, with specifications within the Marine Vibrator Joint Industry Project (MVJIP) guidelines [32,33].…”

Section: Sources Levels Marine Vibroseis (Mv)mentioning

confidence: 99%

A Modeling Comparison of the Potential Effects on Marine Mammals from Sounds Produced by Marine Vibroseis and Air Gun Seismic Sources

Matthews

Ireland²,

Zeddies

et al. 2020

JMSE

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Concerns about the potential environmental impacts of geophysical surveys using air gun sources, coupled with advances in geophysical surveying technology and data processing, are driving research and development of commercially viable alternative technologies such as marine vibroseis (MV). MV systems produce controllable acoustic signals through volume displacement of water using a vibrating plate or shell. MV sources generally produce lower acoustic pressure and reduced bandwidth (spectral content) compared to air gun sources, but to be effective sources for geophysical surveys they typically produce longer duration signals with short inter-signal periods. Few studies have evaluated the potential effects of MV system use on marine fauna. In this desktop study, potential acoustic exposure of marine mammals was estimated for MV and air gun arrays by modeling the source signal, sound propagation, and animal movement in representative survey scenarios. In the scenarios, few marine mammals could be expected to be exposed to potentially injurious sound levels for either source type, but fewer were predicted for MV arrays than air gun arrays. The estimated number of marine mammals exposed to sound levels associated with behavioral disturbance depended on the selection of evaluation criteria. More behavioral disturbance was predicted for MV arrays compared to air gun arrays using a single threshold sound pressure level (SPL), while the opposite result was found when using frequency-weighted sound fields and a multiple-step, probabilistic, threshold function.

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The use of high productivity vibroseis techniques for 2D onshore seismic acquisition

Dean

2024

Exploration Geophysics

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The use of pseudorandom sweeps for vibroseis acquisition

Cited by 7 publications

References 0 publications

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: Concept and method

Blended acquisition with temporally signatured/modulated and spatially dispersed source array: Concept and method

A Modeling Comparison of the Potential Effects on Marine Mammals from Sounds Produced by Marine Vibroseis and Air Gun Seismic Sources

The use of high productivity vibroseis techniques for 2D onshore seismic acquisition

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