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- Volume 19, Issue 6, 2001
First Break - Volume 19, Issue 6, 2001
Volume 19, Issue 6, 2001
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Petroleum Geology developments in E&P
Authors J. Hankla, J. Martin, B. Weaver, X.M. Tang, A. Shaw, K. Hitchen, M.J. Roberts and A. KirkwoodFirst Break takes a look at some aspects of petroleum geology showing its key role in exploration and production operations and increasing emphasis for reservoir performance. Two items on fractures are followed by a study of the 'frontier' Hatton Basin and a multidisciplinary approach to geosteering. The following articles are collected: -'Bringing research and technology to optimize reservoir performance' -'An optimized completion process case history: improving zone selection and stimulation design using Stoneley wave permeability data and forward fracture modelling', by Jim Hankla, Jon Martin, Bob Weaver, Xiao Ming Tang and Andy Shaw -'Is Hatton Bank the new Jeanne d'Arc Basin?', by Ken Hitchen - Real-time geosteering in the Tern Field for optimum multilateral well placement' by M.J. Roberts, A. Kirkwood and J. Bedford
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Integration of seismic, MT and gravity data in a thrust belt interpretation
More LessOne of the main problems in geophysics is how to produce a consistent and reliable model of a given geophysical/geological system, integrating independent data sets with different physical meaning, acquisition scale, resolution power, quality and so on. This situation is frequent in the thrust belt environment, especially when the quality of near vertical reflection seismic data is low: in this case many efforts are made to apply alternative geophysical tools, such as wide angle seismic, magnetotelluric and gravity methods. In this paper we present a possible approach to managing the integration of many data sets to produce a final consistent geophysical model. The real-life case of an exploration survey performed in Southern Italy, in the Southern Apennines, is considered as an example of the approach. This is presented as a series of sequential steps giving a corresponding series of 'partial models' converging into a final geophysical model, but it is much more appropriate to consider the methodology as a circular and iterative process, which is more consistent with an approach to a complex domain.
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Continuous gradient VLF measurements: a new possibility for high resolution mapping of karst structures
Authors F.P. Bosch and I. MüllerThe Centre of Hydrogeology Neuch‚tel (CHYN) investigates and monitors karst aquifers, which are highly vulnerable to contamination. One of our particular research tasks within this scope is the characterization and localization of the 'epikarstic zone' (0-20 m depth) (Mangin 1975; Kiraly 1995). Density, size and aperture of fractures that connect the water reservoir with the surface, are features which characterize the vulnerability of karst aquifers. Very local scale mapping of these types of high-permeability fracture zone over extensive areas is therefore of interest for karst hydrogeology. In order to investigate this zone the very low frequency (VLF, 15-30 kHz) method has been adapted at CHYN for investigation at shallow depths with high lateral resolution. Geophysical surveying using VLF radio signals began in the 1960s as a tool for prospecting conductive minerals (McNeill & Labson 1991; Paal 1965). The CHYN equipment uses VLF and low frequency (LF, 30-300 kHz) radio transmitters, which are located at several positions around the world and are used principally for navigation and submarine communication. Consequently the CHYN has developed a radio frequency-resistivity device (RF-R), also called radio magnetotelluric (RMT, 12-240 kHz), and a continuously measuring radio frequency-electromagnetic (RF-EM, 15-300 kHz) device (Turberg et al. 1994; Turberg & Barker 1996; Stiefelhagen 1998). In fissured limestone with a resistivity of several hundreds of Wm, the penetration depth for these frequencies is about 10-100 m. However, when investigating small structures at very shallow depths (0-10 m) in the epikarstic zone, these devices have limited use due to their excessive penetration depths and their poor horizontal resolution. In this paper we introduce a method that is based on measuring the vertical gradient of the horizontal magnetic field component of VLF radio signals (VLF-EM-vGRAD(Hy)). According to our knowledge, such a technique has not been previously published.
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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)