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- Volume 32, Issue 1, 2014
First Break - Volume 32, Issue 1, 2014
Volume 32, Issue 1, 2014
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A high frequency vibroseis tool
By Z. WeiZhouhong Wei demonstrates how a newly designed small vibrator can output measured ground force at a wide frequency range.
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High-density 3D point receiver seismic acquisition and processing – a case study from the Sichuan Basin, China
More LessFusen Xiao, Jinli Yang, Bo Liang, Meng Zhang, Rong Li, Fang Li, Hongping Xiao, Xue Lei, Qinglin Liu and Thomas Heesom present the planning, acquisition, processing and results from a full-azimuth high-density point-source, point-receiver broadband seismic survey over part of the Gongshanmiao structure in the Sichuan Basin, southwest China.
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Current cabled and cable-free seismic acquisition systems each have their own advantages and disadvantages – is it possible to combine the two?
By R. EllisRobin Ellis discusses a new architecture that breaks the current paradigm in an attempt to offer the best of both worlds.
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A cable-free land seismic system that acquires data in real time
By D. CriceDoug Crice explains the design details of a cable-free seismic acquisition system that retrieves data in real time and demonstrates its effectiveness on a recent survey in Kurdistan using 7500 channels - believed to be a world record for real-time wireless data acquisition.
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A petrographic coded correlation between interface conductivity and other pore space properties
Authors N. Gegenhuber, M. Ochabauer and C. PreuerElectrical conductivity is an important property in geoscience and petroleum engineering. It gives not only information about the porosity and water saturation, but also about interfacial conductivity and about specific internal surface of the pore space. Archie’s equation correlates the electrical resistivity of a water-saturated rock sample and the resistivity of the pore water. A more detailed investigation with brine of different salinities results in the observation of interface conductivity, which is correlated to a specific internal surface. Measurements with increasing salinity of the brine were carried out on different samples: sandstone, carbonate and magmatic rocks. Additionally, permeability and effective porosity were determined. The resulting true formation factor and interfacial conductivity were then correlated with porosity and permeability. Analysis of data allows the application of the interface term as a measure of specific internal surface. For the interpretation of results, the simple capillary model a semi-empirical equation is used and delivers permeability as function of porosity, formation factor and interface conductivity. Determined permeability out of the calculations is compared with measured permeability. The developed equation which is dependent on the porosity, interface conductivity, formation factor and covers additionally the lithology influence can be used for a permeability calculation with a reasonable fit.
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Reconstruction of water encroachment history in 4D in a brown field using a time-lapse pulsed neutron capture log – A case study
Authors D. Ghosh, B. Al-Enezi and D. Al-MatarThe objective of this paper is to illustrate the use of pulsed neutron capture log in reconstruction of water encroachment history in time and space in a brown field. Time-lapse pulsed neutron logs tracked the movement of oil-water contact in wells through time. This data from multiple wells was used to reconstruct the oil-water contact surfaces at different times for the area studied. The study resulted in a remaining oil column height map for the area and also predicted future water movement patterns. The remaining reserves at different times were calculated using a static model and these fluid contact surfaces. Estimated production between these time surfaces as computed from the static model matched well with the recorded actual production giving credence to the study.
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The role of near topography and building effects in vertical gravity gradients approximation
Authors P. Zahorec, J. Papčo, M. Mikolaj, R. Pašteka and V. SzalaiováThe gravitational effect of the topography and near-building structures and their contribution on the vertical gradient of gravity (VGG) was studied. The strong impact of near topography on the VGG values was found in the case of the mountainous areas – deviations of up to 88% of normal value were obtained by means of relative gravity measurements in selected parts of Slovakia. Newly developed software and a high-quality detailed digital terrain model of Slovakia was used for the evaluation of the topographical effect. The gravitational effect of near-building structures was estimated by means of simple 3D bodies approximation, i.e., rectangular or polygonal prisms. A very specific non-linear behaviour of VGG is demonstrated on model examples. A relatively good agreement between the measured and calculated (predicted) VGG values was achieved for a set of selected 32 real measurement points. The application of estimated (predicted) values of the VGG instead of the normal ones can lead to a quality improvement of global and local gravimetric reference networks, as well as prospecting VGG measurements.
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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)