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- Volume 18, Issue 5, 2000
First Break - Volume 18, Issue 5, 2000
Volume 18, Issue 5, 2000
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3D design symposium
Authors K. Hornmann, G.J.O. Vermeer, M. Lansley, J. A. Musser, M. Galbraith, J. Meunier, E.R. Gillot and D. MonkFor the workshop '3D Seismic surveys: design, tests and experience' held at the 61st EAGE Conference on 5 June 1999, five specialists in the design of 3D surveys were invited to recommend survey design parameters, based on a common case study. Participants were Mike Galbraith (Seismic Image Software), Malcolm Lansley (Western Geophysical), Julien Meunier (CGG), David Monk (Apache Corporation) and Jim Musser (Gren Mountain Geophysics). Their recommendations are reproduced in the articles following the introductory paper.
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Improved satellite transmission speeds challenge conventional wisdom on processing marine seismic data
By A. McBarnetWestern Geophysical is trialling satellite data transfer technology originating from NASA space operations. If successful, it could alter the current model for data transmission and processing for marine seismic survey data. Andrew McBarnet reports. Along with just about everyone in the E&P industry, Apollo astronaut Bill Anders will be an interested observer when Western Patriot, one of Western Geophysical's latest 3D seismic acquisition vessels, tries out the first SeismicStar terminal developed by SpaceData International (SDI). SeismicStar is billed as the world's fastest commercial satellite data transmission system, and a successful test on board the Western Patriot could foreshadow a change in the way all seismic contractors and their oil industry customers expect marine seismic data to be managed and processed in the future. Anders was one of the first shareholders in SDI, a privately held company created to commercialise the NASA space programís telecommunication assets. According to president Jay Gnowles, the company immediately recognized the possible applications of the technology in the marine seismic market and have spent the best part of two years developing a suitable system. But he admits that changing the status quo will not be easy given the current investments in onboard processing. 'The game will be to convince oil company customers in particular that the SeismicStar technology can be justified,' Gnowles says. The attraction of the SeismicStar is that it claims to have overcome the limitations of existing high speed satellite data transfer systems and can transmit uncompressed files of seismic acquisition data at previously unrealized speeds. For example, SDI believes that under a 10-streamer configuration with dual air gun sources and 240 channels per cable, Western Patriot might generate some 165 Gbytes of raw seismic data daily. With SeismicStar this could be immediately transferred from anywhere in the world in 81 minutes at a rate of 311 Mbps to Westernís processing centre in Houston without any compromise to the quality of the data. SDI adds that systems are in design which will halve this transmission time.
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Will Schlumberger's Q system provide the cue to a revolution in seismic acquisition
By A. McBarnetSchlumberger has launched Q-Land, the first component of what it hopes will be a revolution in seismic data acquisition and processing. Andrew McBarnet reviews the evidence so far. Can it justify the hype? That's the question that the exploration industry will be asking now that Schlumberger Oilfield Services has unveiled Q-Land, the first component of what is claimed to be a revolutionary seismic acquisition and processing system. CEO Euan Baird was on hand for the official launch of the system in March at the Bahrain Geo 2000 exhibition which suggests that the company itself believes it is onto something significant with its new Q-Land technology. Visitors to Glasgow EAGE 2000 will be able to judge for themselves later this month. In the meantime we know that QLand in Schlumbergerís mind represents quality and a quantum leap in seismic imaging technology, which represents a platform for continuous improvements spanning not just land but marine and borehole applications. The company says that the Q-Land revolution, as opposed to evolution, arose as a result of scientists and engineers returning to first principles to overcome limitations in current practice. They came up with the Q-Land system which records single sensors rather than grouped arrays of sensors as found in conventional systems and offers a real time 30†000 channel acquisition capability (at 2†ms sample rate), a stunning increase on the maximum number of channels currently being used. In summary, Q-Land is designed to provide enhanced imaging quality and resolution to improve selection of targets and well locations, reduce acquisition time, offer proof to verify booking of reserves and ultimately assist production and reserve management. Mario Ruscev, president Schlumberger Reservoir Evaluation Seismic, said the Q system would 'prove particularly beneficial to any client whose prospect has complex logistics, a poor signal-to-noise ration, groundroll contamination, statics problems or elevation variations,' adding that specific applications included 3D multicomponent seismic, high resolution imaging and avoiding potential drilling hazards. The system was qualified in 1999 and is now operational in the Middle East.
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First Break annual review of companies serving the geoscience industry
Feature of some of the main companies active in the geoscience area of the E&P industry, including exhibitors at the 62nd EAGE Conference and Technical Exhibition being held in Glasgow, Scotland. This annual reference guide is based on information supplied by the companies listed.
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Multiple suppression on a polar shelf - a case study in the Weddell Sea, Antarctica
Authors E. Schmidt and W. JokatDuring the past decade, the Antarctic continental shelf has been the subject of intensive seismic investigations with regard to its glacial history. In most marine seismic data from this area, high amplitude multiple reflections are a major problem. They are generated at the water bottom (a particularly high impedance interface) and account for a large fraction or even the majority of the recorded amplitude. Unusually well-compacted and flat-lying sediments in the near-surface give rise to a high seismic reflection coefficient at the seafloor. This overcompaction of the polar shelf sediments is evident from the high seismic velocities ranging from 2.0 to 2.6 km/s in the upper 150 m of the subsurface and is due to former ice load. At least since Eocene times, repeated glacial cooling has resulted in episodic expansions of the Antarctic ice sheet, and large grounded ice bodies have covered the Antarctic shelf out to the shelf edge during glacial periods.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)