Broadband Q-Factor Imaging for Geofluid Detection in the Gulf of Trieste (Northern Adriatic Sea)

Vesnaver, Aldo; Böhm, Gualtiero; Busetti, Martina; Cin, Michela Dal; Zgur, F.

doi:10.3389/feart.2021.640194

Cited by 9 publications

(8 citation statements)

References 48 publications

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“…The high-resolution data show the presence of features that are correlated to fluid seeps coming from the sediment below the high reflective horizon of the probable peat layers. The fluids could be either gas and/or water, and their seeps in the north-eastern Adriatic Sea have been previously recognised, e.g., [77][78][79][80][81].…”

Section: Resultsmentioning

confidence: 99%

Geophysical and Geological Views of Potential Water Resources in the North-Eastern Adriatic Sea

et al. 2022

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The increasing demand for freshwater requires the identification of additional and less-conventional water resources. Amongst these, offshore freshwater systems have been investigated in different parts of the world to provide new opportunities to face increasing water requests. Here we focus on the north-eastern Adriatic Sea, where offshore aquifers could be present as a continuation of onshore ones. Geophysical data, in particular offshore seismic data, and onshore and offshore well data, are interpreted and integrated to characterise the hydrogeological setting via the interpretation of seismo-stratigraphic sequences. We focus our attention on two areas located in the proximity of the Tagliamento and Isonzo deltas. Well and seismic data indicate that the Quaternary sediments, that extend from onshore to offshore areas, are the most promising from an offshore freshwater resources point of view, while the several kilometres thick pre-Quaternary carbonate and terrigenous sequences likely host mainly salty waters.

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Section: Resultsmentioning

confidence: 99%

Geophysical and Geological Views of Potential Water Resources in the North-Eastern Adriatic Sea

et al. 2022

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“…This property is well approximated by seismic signals produced by impulsive sources such as air guns, dynamite, and Boomer systems. Practical experience shows that deconvolution also works when enveloped Chirp data are processed [5]. The following theorem proves that enveloped Boomer data, whose original waveform is in a minimum phase, can be deconvolved to obtain stable results.…”

Section: Deconvolutionmentioning

confidence: 91%

“…In contrast, muddy or unconsolidated soils are preferable when it comes to deploying underwater communication cables, so they can be easily covered and better protected from interference by fish and humans [2]. Further applications include offshore engineering [3] and control of coastal erosion [4] and gas plumes' emission [5].…”

Section: Introductionmentioning

confidence: 99%

“…When taking the envelope of the original full-waveform data (either Chirp or Boomer) we lose some information, such as the signal polarity [5]. Some visual help for seismic interpreters, who are used to a bipolar signal, can be obtained by converting the positive-only enveloped signal into a seismic-like wavelet [20], which is better handled by conventional processing tools developed for seismic data.…”

Section: Introductionmentioning

confidence: 99%

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Amplitude Recovery and Deconvolution of Chirp and Boomer Data for Marine Geology and Offshore Engineering

2021

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The processing of Chirp data is limited by the usual recording of the signal envelope, which enhances its immediate visibility but prevents applying methods based on wave equations. This is normally not the case for Boomer data. However, both systems are monochannel instruments, which cannot estimate properly the propagation velocity of the signal in the rocks. In this paper, we present two theorems: the first one links the Chirp or Boomer source spectrum with an expected amplitude decay curve; the second one defines conditions for the deconvolution stability of the enveloped Boomer signal when the full waveform of the source signal is known. In this way, we can jointly process and integrate heterogeneous surveys including both data types. We validated the proposed algorithms by applying them to synthetic and real data. The presented tools can improve the image resolution and the characterization of geological formations in marine surveys by reflectivity anomalies, which are distorted by standard equalization methods.

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“…We aligned this window of events by maximizing the coherence between shifted primaries and their multiples, scaled by a factor that minimized the resulting energy. For more details, we refer the reader to Vesnaver et al (2021).…”

Section: Multiples' Attenuationmentioning

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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Broadband Q-Factor Imaging for Geofluid Detection in the Gulf of Trieste (Northern Adriatic Sea)

Cited by 9 publications

References 48 publications

Geophysical and Geological Views of Potential Water Resources in the North-Eastern Adriatic Sea

Geophysical and Geological Views of Potential Water Resources in the North-Eastern Adriatic Sea

Amplitude Recovery and Deconvolution of Chirp and Boomer Data for Marine Geology and Offshore Engineering

A workflow for processing mono‐channel Chirp and Boomer surveys

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