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- Volume 3, Issue 5, 1985
First Break - Volume 3, Issue 5, 1985
Volume 3, Issue 5, 1985
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History and present state of the art of geophysics in Hungary
Authors É. Kilényi and Z. SzabóIn Hungary the history of geophysics starts with Loránd Eötvös, born in 1848. After graduating in physics and mathematics at the University of Heidelberg he became a lecturer and later professor of physics at the University of Budapest. Having first studied capillarity Eötvös then turned his attention to gravitation and magnetism. From then onwards for nearly forty years until his death in 1919, he was concerned with these two fields. In his research on the spatial changes in gravitation, he used a special version of Coulomb's torsion balance. He built two different types of torsion balance for carrying out his gravitational investigations: in the first type the masses were at the same level (curvature variometer); in the second type (horizontal variometer, known as the Eötvös torsion balance) the masses were at different levels. The horizontal variometer gives the 'gradient' of gravity which is defined as the rate of change of gravity over a horizontal distance of 1 cm. Eötvös carried out his first field measurements on Ság Hill in Transdanubia in 1891.
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Well log interpretation of metamorphic hydrocarbon-bearing formations
More LessExploration for hydrocarbon reservoirs within fractured and weathered zones of the crystalline basement is of great importance in Hungary. The majority of hydrocarbon reserves found in recent years have come from metamorphic reservoirs in the basement. Metamorphic hydrocarbon-bearing formations are generally characterised by complex lithology, low porosity and a heterogeneous distribution of pore sizes and fractures. The interpretation of well logs from these formations is an especially difficult task because of the above-mentioned properties, yet the required standards of data quality are the same as in the case of sedimentary reservoirs. The interpretation of weil logs to locate reservoir zones and phase boundaries has been made even more difficult because many of the boreholes have been logged with only a few tools. It was therefore necessary to develop a novel method of well log interpretation which could produce useful results even in cases when the selection of well logs had been far from optimal. The low porosity has made it essential that reservoirs are not damaged by cementing in casing before logging. These circumstances and the need to obtain more accurate reservoir characteristics have led to the application of production well logging techniques. The interpretation of production well logging and open hole data has resulted in a better understanding of the nature of reservoirs of metamorphic lithology and poor reservoir characteristics, and in a significant improvement in their exploitability.
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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)