Simultaneous long offset (SLO) towed streamer seismic acquisition

Andrew Long; Eddy von Abendorff; Michael Purves; Justin Norris; Alcindo Moritz

doi:10.1071/ASEG2013ab126

ISSN: 2202-0586
E-ISSN:

oa Simultaneous long offset (SLO) towed streamer seismic acquisition
Authors Andrew Long^a, Eddy von Abendorff^b, Michael Purves^c, Justin Norris^d and Alcindo Moritz^e
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^a PGS, Level 4, IBM Centre 1060 Hay Street West Perth, , WA, 6005, Australia, [email protected] ^b PGS, 4 The Heights Brooklands, Weybridge Surrey, , KT13 0NY, UK, [email protected] ^c Ophir Energy Plc, Level 2 464 Hay Street Subiaco, , WA, 6008, Australia, [email protected] ^d Ophir Energy Plc, 50 New Bond Street First Floor London, , W1S 1BJ, UK, [email protected] ^e Petrobras Av. Republica do Chile, 330 - Ed. Ventura/Torre Leste 24th floor 20031-170-Centro Rio de Janeiro, Brazil, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab126
- Published online: 01 Dec 2013

Abstract

An innovative 3D towed streamer project in offshore Gabon used a dual-vessel continuous long offset streamer configuration to acquire 0-12 km offsets with ten dual- sensor streamers. Streamer control for the 6 km streamers was robust and avoided operational complications or logistical penalties. Simultaneous shooting maximized inline shot density for long record lengths, thus capturing unaliased deep target reflections from rugose base-salt and sub-salt horizons. Survey design benefited from prior 2D survey experiences with a variety of broadband source and streamer technologies, and the use of 2D streamers as long as 12 km. 3D illumination modelling further suggested that offsets as long as 16 km could be expected to yield useful base-salt and sub-salt reflections.

Wavefield separation processing yielded full receiver- side deghosting onboard, followed by an inversion-based separation of simultaneous shots onshore. The ultra-long 12 km offsets combined with strong amplitudes of deghosted low frequencies have yielded encouraging sub- salt and pre-salt imaging.

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2013-12-01

2026-01-14

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References

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Article Type: Research Article

Keyword(s): dual- sensor streamer; Gabon; illumination; long offsets; pre-salt; simultaneous shooting; sub- salt; wavefield separation

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