Very High Resolution 3D Seismic Imaging of a Complex Shelf Structure in the Adriatic Sea

Marsset, Bruno; Thomas, Y.; Thereau, Estelle; Didailler, Stéphane; Marsset, Tania; Cochonat, Pierre; Cattaneo, Antonio

doi:10.1007/978-94-010-0093-2_49

Cited by 1 publication

(5 citation statements)

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“…The 3D acquisition system developed by IFREMER (Marsset, 2001;Marsset et al, 2002) is capable of being dimensioned in a dynamic way for optimal coverage of geotechnical and geological sites of small extent (2 km by 1 km) in water depths up to 200 m, penetration up to 100 m and a vertical target resolution of decimetric scale. Detailed methodology and technical aspects of the 3D seismic approach are provided in Marsset (2001), Marsset et al (2002Marsset et al ( , 2003a. The TRIAD 3D seismic data set was collected in August 2001 using a sparker source (metric resolution) and four streamers (six seismic traces, 2 m apart) with a 5-m spacing between streamers (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The processed 3D block consists in a cube of 1827Â395 elementary (2Â2 m) cells, each cell extending through depth at a 20-cm sampling interval. Additional information on acquisition and processing can be found in Marsset (2001), Marsset et al (2002Marsset et al ( , 2003a. In-line and cross-line seismic sections as well as depth slices or cubes have been extracted from the 3D block for interpretation (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…doi:10.1016/j.margeo.2004.10.002 (Gardner et al, 1999;Faugères et al, 2002;Lee et al, 2002). For this purpose, a small area was selected for a Very High Resolution (VHR) 3D seismic survey (Marsset et al, 2003a). The survey was conducted in an area covering a surface of 800Â3600 m at a water depth of 50-70 m (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…(a) In-line profile; (b) slice showing absence of gas within U3, which seems to play the role of a gas-tight layer at this resolution; (c) slice showing alignments of gas pockets within U2, thus evidencing weak lines along which gas concentrated preferentially; (d) slice showing that U1 is partially affected by gas, making it difficult to distinguish the internal geometry and the seismic facies in profiles (modified fromMarsset et al, 2003a).…”

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confidence: 97%

“…Schematic view of the VHR3D acquisition layout and of the 3D data cube (modified fromMarsset et al, 2003a).…”

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confidence: 99%

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Analysis of Holocene sedimentary features on the Adriatic shelf from 3D very high resolution seismic data (Triad survey)

Marsset

Thomas

et al. 2004

Marine Geology

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Very High Resolution (VHR) 3D seismic data were collected on the Adriatic shelf offshore the city of Ortona in order to define the small-scale geometric complexity of late Holocene deposits. Three groups of units are distinguished from the bottom up: (1) units U1 to U3 forming the Transgressive System Tract (TST); (2) units U4 and U5 representing the condensed interval deposited on the Maximum flooding surface (MFS) and the basal unit of the High stand System Tract (HST); and (3) U6 to U10 forming the progradational units of the HST. The muddy HST deposits show seafloor and subsurface sedimentary features over up to 40% of its extent on the Adriatic shelf. In the area offshore Ortona, the HST shows shore-parallel undulations in water depth of ca. 30-70 m and mud reliefs in water depth of ca. 70-110 m. The mud reliefs are subcircular in plan view and occur in swarms, perpendicular to the regional contour, that are connected to each other by shore-parallel junctions. The genesis of these features is interpreted as a combination of two different mechanisms: (1) sediment deformation in relation with the condensed section; and (2) depositional process related to shore-parallel currents interacting with topographic irregularities. The evolution of the HST sedimentary pattern is closely related to a bkey unitQ (U5) that influences both the seaward transition from linear to complex features and the stacking pattern. D

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%