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- Volume 31, Issue 6, 2013
First Break - Volume 31, Issue 6, 2013
Volume 31, Issue 6, 2013
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Reserves estimation methods for prospect evaluation with 3D CSEM data
More LessDaniel Baltar and Friedrich Roth, explain how 3D controlled-source electromagnetic data can reduce volumetric uncertainty in the reserves estimates process of prospect evaluation.
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Rock Physics workflow including application of the Xu-Payne multi-porosity model on chalk reservoirs on the western platform, UK North Sea
Authors D.M. Hammond and S.S. PayneD.M. Hammond and S.S. Payne present an application of the new Xu-Payne model, which classifies carbonate rocks as dual porosity systems, to investigate the fluid effects within the chalk play of the Central Graben for quantitative seismic interpretation. The model was calibrated using log data from three wells on the western platform of the UK North Sea.
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Broadband, long-offset, full-azimuth, staggered marine acquisition in the Gulf of Mexico
Authors F. Mandroux, B.S. Ong, C.-O. Ting, S. Mothi, T. Huang and Y. LiFabrice Mandroux, Beng S. Ong, Chu-Ong Ting, Sabaresan Mothi, Tony Huang and Yunfeng Li describe the first use of a staggered vessel configuration in the Gulf of Mexico to improve imaging of challenging geological structures.
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Frontier exploration offshore the Zambezi Delta, Mozambique
Authors M. Uzcategui Salazar, D. Baker, M. Francis, D. Kornpihl and T. WestMarjosbet Uzcategui Salazar, David Baker, Malcolm Francis, Duplo Kornpihl and Tekena West present the results of a study into the hydrocarbon potential of the offshore Zambezi Delta area of Mozambique.
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Improving safety performance in geophysical operations: one major operator’s journey
Authors I.M. Threadgold, T.R. Seaborne, N. Cave and D.J. HarrisonIan M. Threadgold, T. Richard Seaborne, Neil Cave and David J. Harrison describe a 13-year journey by a major oil and gas operator in pursuit of consistent excellence in health, safety, and environmental (HSE) performance across its worldwide geophysical operations.
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Towed streamer EM: the challenges of sensitivity and anisotropy
Authors J. Mattsson, F. Engelmark and C. AndersonJohan Mattsson, Folke Engelmark and Chris Anderson reflect on some of the ongoing issues in the improvement of the newly launched towed streamer EM survey technology.
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Innovation geophysics: a memoir
By H. JamesHuw James provides this personal memoir of some 50 years involved in the development of computer technology for geophysical applications.
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Earth disciplines, cognitive sciences and the epistemology of complexity
More LessIn his new book for EAGE Publications, Paolo Dell’Aversana argues that the geosciences can contribute to illuminate some unsolved problems of epistemology and cognition. Conversely, epistemology and cognitive sciences can inspire approaches and solutions for practical problems in the Earth sciences. Some of the concepts are summarized in this introduction.
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Salt tectonics in the Sivas Basin, Turkey: outstanding seismic analogues from outcrops
Authors J.-C. Ringenbach, J.-F. Salel, C. Kergaravat, C. Ribes, C. Bonnel and J.-P. CallotThe Sivas Basin in Central Anatolia is possibly the world’s finest open-air museum of salt tectonics structures. It is an elongated Oligo-Miocene sag basin that developed in an orogenic context above the Neotethys suture zone. A mid-Oligocene quiet period during convergence of the Arabian and Eurasian plates allowed the deposition of a thick sequence of evaporites. Erosion of the Taurus Mountains shed clastic sediments northwards over the evaporitic basin. Sediments and deformation propagated from the south, forming mini-basins and associated evaporite diapirs and walls. Following this quiet period, compression resumed in the early Miocene, enhancing the formation of gypsum overhangs and allochtonous sheets. The Sivas outcrops expose classic salt tectonics geometries associated with the development of diapirs: halokinetic sedimentary sequences along diapir walls, welds and evaporite sheets or canopies, minibasins, and overturned minibasin wings (overturned edges of minibasins). These exposures are some of the finest field analogues for classical petroleum provinces controlled by salt tectonics such as the Gulf of Mexico and offshore Angola. We illustrate seismic-scale structures and, in the vicinity of the evaporite bodies, interesting analogues for drilled structures where seismic data do not provide an image.
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Evidence of faulting contradicts a quiescent northern Barents Shelf during the Triassic
Authors I. Anell, A. Braathen, S. Olaussen and P.T. OsmundsenIt has generally been considered that the Triassic was a tectonically quiescent period on the northern Barents Shelf. Located on the distal Uralide foreland, sedimentation was dominated by the advance of prograding deltaic systems. The Triassic succession exposed on Edgeøya (east Svalbard) displays two interacting types of growth fault: listric faults that sole out in the Triassic pro-delta/marine shales; and steeper, more planar, normal faults with a deeper-seated origin. In the nearby offshore realm, 2D seismic data suggest a previously undocumented phase of minor extensional movements during the Triassic that renewed activity on deep-rooted faults initiated during the Palaeozoic. The faults strike approximately east–west, onshore and offshore, with most fault throws down to the south. The seismic data in the Upper Triassic sequence also show smallscale offsets, curved reflectors, and a generally more chaotic signature suggestive of syn-sedimentary disruption. The coeval timing and orientation suggest a link between the reactivation of faults that reach the basement and the development of shallow growth faults. Triassic fault activity has previously been documented in the south. Its occurrence in the north, too, suggests a regional, crustal-scale driving force. We speculate that Uralide foreland deformation preferentially reactivated older east–west basement-seated fault zones.
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Tutorial: the seismic response to strong vertical velocity change
By I.F. JonesConventional seismic data processing, whether pre-stack data conditioning or migration, is designed with the theory of P-wave reflected energy in mind for travel paths involving only a single reflection. Hence, any energy propagating with other modes or travel paths is not dealt with appropriately during conventional processing. It is primarily for this reason that we spend so much time pre-conditioning seismic data to meet the assumptions of the subsequent processes such as migration. Here I consider a typical North Sea environment where there are both strong vertical compaction gradients and high velocity contrasts in the layered Chalk Formation. I assess the behaviour of refracted and mode-converted seismic arrivals when subjected to conventional processing in order to explain how they give rise to anomalous events that contaminate migrated common reflection point gathers and images.
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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)