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- Volume 27, Issue 2, 2009
First Break - Volume 27, Issue 2, 2009
Volume 27, Issue 2, 2009
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Technologies from foothills seismic imaging: replacements or complements?
Authors R. Vestrum and J. GittinsRob Vestrum and Jon Gittins challenge the assumption that the latest seismic imaging technology is always superior to older tried and tested methods, taking exploration in the Canadian foothills as an example.
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Arctic near surface challenges: the point receiver solution to coherent noise and statics
Authors C. Strobbia, A. Glushchenko, A. Laake, P. Vermeer, T.J. Papworth and Y. JiClaudio Strobbia, Anna Glushchenko, Andreas Laake, Peter Vermeer, Stuart Papworth and Ying Ji provide a case study illustrating the benefits of single sensor seismic acquisition and processing to overcome the complexities presented by the arctic near surface.
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Cableless system meets challenge of acquiring seismic to define subtle fractures in complex shale
Authors D. Chitwood, J. Tinnin, C. Hollis and F. HernandezDon Chitwood, John Tinnin, Cara Hollis and Fernando Hernandez provide a detailed description of a cableless land seismic operation carried out by ION Geophysical over Durham Ranch, a remote and environmentally sensitive area of northwestern Colorado.
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Southern Mediterranean offshore basins still offer promise of oil and gas riches
More LessMohamed Zine and James Veron of IHS provide this brief on the main areas of interest for offshore hydrocarbons exploration in the southern area of the Mediterranean Sea bordered mainly by North African countries.
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Seismic evaluation of reservoir quality and gas reserves of DHI-supported deep water systems in the offshore Nile Delta
Authors M. Galbiati, M. Fervari and G. CavannaMauro Galbiati, Massimo Fervari and Giorgio Cavanna (Eni Exploration and Production) offer some insights into techniques designed to resolve the challenge of accurately evaluating seismically thin reservoirs encountered in the offshore Nile Delta.
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Offshore Malta licence in the Central Mediterranean Sea offers hope of hydrocarbon potential
Authors L. Lipparini, D. Scrocca, P. Marsili and S. MorandiL. Lipparini, D. Scrocca, P. Marsili and S. Morandi discuss the prospects for hydrocarbons discovery in a little explored area offshore Malta, adjacent to Libyan waters.
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From mud to shale: rock stiffening by micro-quartz cementation
Authors B. Thyberg, J. Jahren, T. Winje, K. Bjørlykke and J.I. FaleideFor the first time, direct petrographic evidence of fine-grained (1–3 μm) crystals of pore-filling quartz cement in mudstones is documented. The cathodoluminescence responses of the micro-quartz give a clear indication of an authigenic origin. The detection of micro-quartz cement in drill-bit cutting samples at depths around and deeper than 2500 m (80–85°C ) of Upper Cretaceous mudstones in the northern North Sea suggests that most of the silica released during mudstone diagenesis is not exported to adjacent sandstones but precipitated locally. The locally precipitated micro-quartz has most likely been sourced by silica released from the dissolution of smectite, resulting in precipitation of illite (and possibly chlorite) during progressive burial. The continuous nucleation–precipitation process, which takes place in the chemical compaction regime close to and above 80–85°C, explains why the micro-quartz crystals are found as isolated grains, short chains, and small nests/clusters of micro-quartz embedded in the fine-grained matrix. The interconnected micro-quartz networks (skeletons) and aggregates probably increase the mudstone stiffness significantly, as indicated by an abrupt increase in P-wave velocity close to 2500 m (80–85°C).
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Data example and modelling study of P-wave azimuthal anisotropy potentially caused by isotropic velocity heterogeneity
By E. JennerAzimuthal variation in traveltimes is increasingly being used as a tool for reservoir characterization and fracture detection. One issue in interpreting the results of azimuthal normal moveout (NMO) analyses is to determine whether the apparent observed anisotropy is due to intrinsic azimuthal anisotropy or, in reality, is primarily caused by lateral velocity variations. A field data example is presented where lateral heterogeneity is suspected as the main cause of an observed azimuthal NMO anomaly. Modelling studies of isotropic media containing lateral velocity variations were performed to investigate the possibility that the observed anomaly in the field data could be caused solely by isotropic lateral velocity variation. In both the modelled and field data, the patterns observed in the apparent velocity anisotropy are very distinctive with obvious correlations between ellipse parameters (fast and slow velocities and azimuth of the fast velocity) and the structure of the lateral velocity variation. The inverted RMS and interval NMO ellipses also show a very high degree of correlation both spatially and temporally, extending below the heterogeneous layer.
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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)