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- Volume 23, Issue 5, 2005
First Break - Volume 23, Issue 5, 2005
Volume 23, Issue 5, 2005
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Applying microtremor analysis to identify hydrocarbon reservoirs
Authors R. Holzner, P. Eschle, H. Zürcher, M. Lambert, R. Graf, S. Dangel and P.F. MeierR. Holzner, P. Eschle, H. Zürcher, and M. Lambert of Spectraseis, R. Graf of Proseis, and S. Dangel and P. F. Meier of University of Zurich describe an innovative passive technology for identifying the presence of geological structures containing hydrocarbon by analyzing low frequency seismic signals. They illustrate the method with results from a pilot study in Brazil.
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A look at fracture characterization using transmitted shear waves
Authors E.L. Nebrija, B.R. Naini and S. AhmedEd L. Nebrija, Bhoopal R. Naini, Saudi Aramco, and Shabbir Ahmed, Schlumberger explain how the use of transmitted shear waves created an added dimension to seismic characterization of fractures that were suspected of contributing to gas production in a Middle East reservoir.
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Leadership and partnership - imperatives for offshore safety
The safety challenges facing the offshore oil and gas industry were the subject of a three day meeting last month at the International Regulators’ Offshore Safety Forum in London. We publish here the view from the top as expressed in the presentations from the chief executives of E&P at Shell and BP.
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Working safely - a continuous journey
By T. HaywardTony Hayward, BP chief executive, exploration & production, suggested that future improvements in safety will depend on a systematic approach to leadership, process, capability and measurement within a culture in which unsafe behaviour is not tolerated.
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How offshore seismic contractors strive safety to improve safety performance
In recent years safety of seismic operations has been a major priority for the International Association of Geophysical Contractors (IAGC). All the indicators suggest that the policy has paid off in terms of offshore safety performance in the industry, so much so that IAGC recently submitted a case for a 2005 Safety in Seas Award presented by the USA National Ocean Industries Association. It was put forward by the IAGC Marine Step Change Steering Committee based on the work and achievements of the IAGC Marine Step Change Party Chiefs Network. We publish extracts from that submission to illustrate how IAGC and its member companies maintain the focus on offshore safety.
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The Damned Hunchback and oil searches in the Libyan desert
Authors F. di Cesare and F. GuidiFranco di Cesare, with Francesco Guidi, offer this memoir of the desert in which the ghosts of World War II came to haunt an Italian oil exploration group in Libya during the 1960s. Virtually all the accompanying photos were taken by di Cesare.
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Seeing through a glass, darkly: strategies for imaging through basalt
Authors J. Maresh and R.S. WhiteIt is a well known problem that thick sequences of lava flows make it difficult to image structure beneath them using seismic methods. This is of particular relevance to oil companies seeking to explore potentially hydrocarbon-bearing sediments in basins with voluminous magmatism. Such basins abound in many current frontier exploration areas, including the Atlantic margin of NW Europe, the South American and African margins of the South Atlantic and both onshore and offshore India. In this paper we summarise recent measurements of the effective attenuation of layered lava sequences from Vertical Seismic Profiles (VSPs) that have been acquired in boreholes penetrating basalts. We then show theoretical modelling results which suggest that much of the effective seismic attenuation is caused by impedance contrasts and hence scattering at the tops and bases of the multiple thin lava flows from which the basalt section is built. Finally we suggest ways in which marine sources and receivers can be optimised in order to enhance the low-frequency response which is required for imaging through sections of stacked basalt flows.
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Further thoughts on the stacking response in seismic data processing
Authors M. Haney, R. Snieder and J. SheimanIn a recent technical article in First Break, Gausland (2004) made the case that the result of stacking is not limited to the often quoted factor of reduction in noise where n is the fold of a CMP-gather. Through his figures and illustrations, Gausland showed that stacking also acts as a frequency and wavenumber filter. Although the intentions of the article were not to, as Gausland put it, ‘give methods or formulae’ and that a ‘simplified analysis can be made using simulation’ instead of mathematics, we could not help but see a connection between his main points and the method of stationary phase (Born & Wolf, 1980). In this comment, we give our interpretation of Gausland’s results within the language of stationary phase.
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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)