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- Volume 18, Issue 4, 2000
First Break - Volume 18, Issue 4, 2000
Volume 18, Issue 4, 2000
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3D visualisation of AVO anomalies
Authors A. Canning, A. Litvin and L. EastwoodAnat Canning, Alex Litvin and Lucy Eastwood of geoscience software and services company Paradigm Geophysical make the case for multi-attribute visualization techniques in the analysis of large AVO data sets claiming faster detection of hydrocarbon anomalies. AVO inversion of 3D data leads to generation of multiple volume attributes. In the case of Shuey-Hilterman formulation Intercept and Gradient volumes are generated. In the case of Aki-Richards formulation the inversion process generates P and S wave reflectivity volumes. In addition to these primary attributes a number of secondary attributes are generated (For example: Constrained gradient, pseudo-Poisson reflectivity, Fluid factor etc.). For confident identification of AVO anomalies the interpreter has to work simultaneously with these multiple 3D attribute volumes. This is an inherent difference between the interpretation of conventional seismic cubes and the interpretation of 3D AVO data. In this paper we will present two approaches to combined visualisation of 3D AVO attributes generated by the application of Shuey-Hilterman inversion scheme to the 3D pre-stack time migrated data set from the North Sea. The first approach uses multi-attribute volume visualisation of AVO attributes. The second approach uses cross-plot based volume visualisation.
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How TGS-NOPEC has proved the exception to the rule
By A. McBarnetWhile most seismic survey companies were bent on survival, 'spec' survey specialist TGS-NOPEC has continued to prosper in a depressed market. Andrew McBarnet asked CEO Hank Hamilton for some nonexclusive answers on the secret of the company's success Things have really worked out at TGS-NOPEC Geophysical Company, the US-Norwegian alliance formed in June 1998 to grow a mutual interest in providing non-exclusive marine seismic data and associated products to the oil and gas industry. After all, how many oil service companies can claim to have had a good year in 1999? TGS-NOPEC's pre-tax profit for year-end 1999 was NOK†193.1 million, less than the NOK†273.9 recorded in 1998 but still healthy. Even more remarkable, in the last quarter of 1999, pre-funding of the company's trademark non-exclusive surveys was running at an enviable 82%. No marine seismic contractor can boast figures like that. Hank Hamilton, CEO of TGS-NOPEC, attributes the company's success to 'being focused and being able to generate new projects and pre-funding.' He agrees that it has also had a lot to do with being lean during the downturn. 'We are not in the same boat as the major seismic contractors. We only have a staff of 150, mainly technical, and our structure and philosophy is different. Most contractors have fixed assets - steel and equipment to keep busy. Any drop in the demand side means a lot of strife, with cuts in staff and assets, which all detract from running the business. In our case, we had to tighten our belts, but not with a lot of pain, and we were able to keep our focus.'
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Seismic penetration problem in the Wadi Field, Sirte Basin, Libya
Authors I.M. Uheida and N. R. GoultyAnalysis of an existing dataset justifies the choice of revised aqcuisition parameters in a poor-data area.
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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)