Evidences of Seismic Flysch Anisotropy in the Gulf of Trieste

Picotti, Stefano; Cin, Michela Dal; Böhm, Gualtiero; Busetti, Martina

doi:10.3997/2214-4609.201802637

Cited by 2 publications

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“…The sediments are draped by the prograding Holocene delta front and pro-delta of the Tagliamento and Isonzo rivers, related to the last marine transgression phase. Along the vertical scale of the profiles is reported the approximated correspondent thickness of 0.01 s twt in meters, calculated by using mean P-wave velocity value (obtained through tomographic analysis; [72][73][74][75]) of 1750 m/s for the Quaternary sediments. The seismic images show the presence of fluids within the sedimentary sequence.…”

Section: Methodsmentioning

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: Methodsmentioning

confidence: 99%

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

et al. 2022

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“…In the Mesozoic, an extensional regime generated NE–SW normal and transtensional faults, allowing the aggradation of the Mesozoic–Paleogene Friuli‐Dinaric Carbonate Platform. In the Paleogene, the Dinaric orogeny gradually developed SW, originating the NW–SE‐trending Karst Thrust along the eastern rocky coast and deflecting the carbonate platform E‐ward, where it reaches a depth of about 1.5 km (Busetti et al ., 2010a,b; Dal Cin 2018; Picotti et al ., 2018). During this phase, the foredeep was filled by the Eocene turbiditic flysch, which thins W‐ward and pinches out on the carbonate margin.…”

Section: Application To Real Datamentioning

confidence: 99%

Windowless Q‐factor tomography by the instantaneous frequency

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Böhm

Cance

et al. 2020

Geophysical Prospecting

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The estimation of the Q factor of rocks by seismic surveys is a powerful tool for reservoir characterization, as it helps detecting possible fractures and saturating fluids. Seismic tomography allows building 3D macro-models for the Q factor, using methods as the spectral ratio and the frequency shift. Both these algorithms require windowing the seismic signal accurately in the time domain; however, this process can hardly follow the continuous variations of the wavelet length as a function of offset and propagation effects, and it is biased by the interpreter choice. In this paper, we highlight some drawback of signal windowing in the frequency-shift method, and introduce a tomographic approach to estimate the Q factor using the complex attributes of the seismic trace. We show that such approach is particularly needed when the dispersion is broadening the waveforms of signals with a long wave-path. Our method still requires an interpretative event picking, but no other parameters as the time window length and its possible smoothing options. We validate the new method with synthetic and real data examples, involving the joint tomographic inversion of direct and reflected signals. We show that a calibration of the frequency-shift method is needed to improve the estimation of the absolute Q factor, otherwise only relative contrasts are obtained.

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Evidences of Seismic Flysch Anisotropy in the Gulf of Trieste

Cited by 2 publications

References 0 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

Windowless Q‐factor tomography by the instantaneous frequency

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