Using GPR and High Frequency Seismic to Locate Under Water Buried Pipes

Barsottelli-Botelho, M.A.; Mesquita, L.

doi:10.3997/2214-4609.201413812

Cited by 3 publications

(2 citation statements)

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“…Thus, multi-parameter Earth models can be estimated with increasing resolution and reliability (Huang to 32 ms), frequency-modulated source-waveform (Gutowski et al, 2002;Schock & LeBlanc, 1990) and a temporally short (<1 ms) impulsive source-waveform (McGee, 1995;Verbeek & McGee, 1995), respectively. These systems are far inferior to multichannel and multi-streamer systems in terms of inversion and imaging quality (Hite & Fontana, 2007;Landais et al, 2014;Moldoveanu et al, 2020), but they may be the best option in busy areas such as harbours (Barsottelli-Botelho & Mesquita, 2015) or sensitive protected areas, such as marine reserves (Gordon et al, 2003), lagoons (Zecchin et al, 2008) or even archeological sites (Müller et al, 2009). Bull et al (1998) modelled the seafloor reflectivity to detect a wreck using the polarity of uncorrelated Chirp data.…”

Section: Introductionmentioning

confidence: 99%

A workflow for processing mono‐channel Chirp and Boomer surveys

Vesnaver

Baradello

2023

Geophysical Prospecting

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Acquiring seismic data with multichannel, multiple‐streamer and even multi‐componentsystems at sea provides excellent images of the Earth. However, the cost and complexity of operations prevent their use in busy areas such as ports or in sensitive environments such as lagoons. In the latter cases, mono‐channel Chirp or Boomer systems are the most viable instruments for marine surveys. The lack of multiple offsets prevents the use of standard tools for amplitude‐versus‐offset and velocity analysis, which are necessary for the lithological characterization of rocks, especially for the shallow sediments in offshore engineering. In this paper, we present a few recent techniques that exploit the traveltime and amplitude of multiple reflections to compensate for the offset limitation, including a new algorithm for the joint tomographic inversion of direct arrivals, primaries and multiples. We have developed a cost‐effective workflow for mono‐channel surveys based on a data‐driven, physically consistent philosophy that attempts to approximately extract lithological parameters, such as P velocity, anelastic absorption, acoustic impedance and even density. We applied the proposed workflow to a real field experiment and obtained a semi‐quantitative estimate for shallow sediments that can be used by offshore engineers.

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Section: Introductionmentioning

confidence: 99%

A workflow for processing mono‐channel Chirp and Boomer surveys

Vesnaver

Baradello

2023

Geophysical Prospecting

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“…Advanced processing techniques such as full-waveform imaging can provide not only the above parameters, but also anisotropy (Alkhalifah 2014, Owusu et al 2016, Huang et al 2020 and anelastic absorption (Askan et al 2007, Komatitsch et al 2016, Vesnaver and Lin 2019. However, this information relies on multichannel recording systems that are expensive and difficult to manage in busy areas such as harbors (Maurenbrecher andWever 1998, Barsottelli-Botelho andMesquita 2015) or sensitive environments such as shallow lagoons or marine protected areas (Richardson et al 1998, Gordon et al 2003, Baradello and Carcione 2008, Tosi et al 2009, or even in archeological applications (Quinn et al 1997, Plets et al 2008, Kim et al 2016). In the latter cases, small boats with a short streamer are appropriate, using only one source and one receiver spaced a few meters apart (Gutowski et al 2002, Müller et al 2002.…”

Section: Introductionmentioning

confidence: 99%

Sea floor characterization by multiples’ amplitude in monochannel surveys

Vesnaver

Baradello

2023

Preprint

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Lithological characterization of the seafloor is key information for offshore engineering, especially when it comes to pier and platform design. Drilling and coring can be used for local sampling, but continuous profiles or even areal coverage are far preferable. High-resolution seismic profiles are successfully used when ports are not too busy, but otherwise single-channel systems must be used. We show in this paper that even these simpler systems can be used to estimate parameters such as the acoustic impedance of shallow sediments directly beneath the seafloor. We exploit the amplitude decay of the multiple reflections between the seafloor and the surface, which does not depend on the source energy. If the offset between source and receiver is not too small, we can estimate the shallow P velocity and, via the acoustic impedance, also the rock density.

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Sea Floor Characterization by Multiples’ Amplitudes in Monochannel Surveys

Vesnaver,

Baradello

2023

JMSE

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The lithological characterization of the seafloor is key information for offshore engineering, especially when it comes to pier and platform design. Undetected shallow gas pockets may cause the collapse of heavy platforms for hydrocarbon production. Unconsolidated sediments are not ideal for the basement of wind farms for electric power production. Drilling and coring can be used for local sampling, but continuous profiles or even areal coverage are far more preferable. High-resolution seismic profiles are successfully used when ports are not too busy, but otherwise, single-channel systems must be used. We show in this paper that even these simpler systems can be used to estimate parameters such as the acoustic impedance of shallow sediments directly beneath the seafloor. We exploit the amplitude decay of the multiple reflections between the seafloor and the surface, which does not depend on the source energy. If the offset between source and receiver is not too small, we can estimate the shallow P velocity and, via acoustic impedance, also the rock density.

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Using GPR and High Frequency Seismic to Locate Under Water Buried Pipes

Cited by 3 publications

References 0 publications

A workflow for processing mono‐channel Chirp and Boomer surveys

A workflow for processing mono‐channel Chirp and Boomer surveys

Sea floor characterization by multiples’ amplitude in monochannel surveys

Sea Floor Characterization by Multiples’ Amplitudes in Monochannel Surveys

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