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- Volume 26, Issue 11, 2008
First Break - Volume 26, Issue 11, 2008
Volume 26, Issue 11, 2008
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The application of airborne electromagnetics to hydrocarbon exploration
Authors R. Smith, D. McConnell and J. RoweRichard Smith, Doug McConnell and Jeff Rowe provide a reality check on the pros and cons of modern airborne electromagnetic methods for hydrocarbons prospecting using either fixed-wing aircraft or helicopters.
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Establishing the ‘air truth’ from 10 years of airborne gravimeter data
Authors S. Elieff and S. FergusonA commercial airborne gravity meter built by Canadian company Sander Geophysics has now been tested periodically for 10 years over a specially selected repeat line. Stefan Elieff and Stephen Ferguson report on the findings.
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Finland’s national airborne geophysical mapping programme and the ‘3-in-1’ approach
By G. MooreGregory Moore recounts the remarkable achievement of the Geological Survey of Finland (GTK) which between 1972 and 2007 conducted a systematic programme of high-resolution, low-altitude airborne geophysical mapping of the entire country using a ‘3-in-1’ approach. The result is the world’s largest database of high-quality airborne geophysical measurement data and a range of special applications in prospecting, geological mapping, and environmental studies.
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How new research programme is aiming to change Australia's minerals industry future
More LessThe Commonwealth Scientific and Industrial Organization (CSIRO) is Australia’s premier research and development organization. Bob Chamberlain outlines how the organization's Minerals Down Under Flagship programme aims to help transform the country's minerals industry.
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Borehole radar investigations for subsurface characterization
More LessJaana Gustafsson explains the value of borehole radar in various contexts including the construction of pit shafts where additional knowledge of the subsurface conditions can be valuable.
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Geophysical prelude to first exploitation of submarine massive sulphides
By P. KowalczykPeter Kowalczyk of Ocean Floor Geophysics describes the early geophysical detection methods being deployed to initiate the exploitation of potentially sizeable global mineral resources to be found in submarine massive sulphide (SMS) deposits.
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Integrated approach to 3D near surface characterization in desert regions
Authors A. Laake, C. Strobbia and A. CuttsAndreas Laake, Claudio Strobbia and Andrew Cutts build on work previously published in First Break to show the value of an integrated approach including remote sensing data to improve near surface modelling in desert areas typical of North Africa and the Middle East.
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Regional context of expected growth in North Africa’s oil and gas services market
Authors S. Robertson and R. WestwoodResults from ‘The Middle East & North Africa Oilfield Services Market Report 2008-12’, published by energy industry analyst Douglas-Westwood, indicate strong growth in the market over the next five years. In this article Steve Robertson and Rod Westwood give some of the thinking behind this view.
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Normalized amplitude ratios for frequency-domain CSEM in very shallow water
By R. MittetThe standard normalized amplitude ratio commonly used for marine CSEM data does not give a reliable and consistent diagnostic reservoir signature since it may give inconsistent readings in different water depths. This ratio only uses electromagnetic field amplitudes. Here a modification of the normalized amplitude ratio is proposed that includes both the amplitude and the absolute phase of the electromagnetic fields. This ratio behaves consistently at all water depths. In particular, it can be used in very shallow water. Frequency-domain CSEM in water depths of 40 m or less can give anomalous responses that can be detected and interpreted reliably by this simple method. The presence of a reservoir may modify the phase more than the amplitude in such shallow water depths. With the modified normalized amplitude ratio this phase change is transformed to an anomalous amplitude. By combining the up/down decomposition process with the modified normalized amplitude ratio, the sensitivity to subsurface resistors in very shallow water is enhanced.
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Extending reservoir property prediction with pseudo-wells
Authors G. Ayeni, A. Huck and P. de GrootWe discuss a procedure called the ‘Hit Cube’ which assigns spatial positions to stochastically simulated pseudo-wells, i.e., 1D stratigraphic columns with attached well logs, with the aim of quantifying probable reservoir properties and their quality throughout a seismic data volume. We generated two sets of pseudo-wells (‘hit targets’, e.g., gas-filled units; and ‘false hits’, e.g., brine-filled units) using real well data, geological knowledge and Monte Carlo statistics. From these models, we constructed scaled synthetic seismic traces using a composite statistical wavelet extracted from the seismic data. We then matched the models with the real traces throughout the seismic volume. At any given location within the seismic cube, we assume that the rock properties defined in the pseudo-wells are similar to those represented by the seismic data if the similarity between the real and synthetic traces satisfies a predefined hit criterion. Final results of this process are likelihood cubes, which can easily be interpreted or used for further analysis. We have used this technique to correctly predict hydrocarbon presence and distribution within a deltaic sequence containing gas-filled and brine-filled channel sand deposits.
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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)