Petrology of the metamorphic basement of the Tisza Block at the Jánoshalma High, S Hungary

Zachar, Judit; Tóth, Tivadar M.

doi:10.1556/ageol.47.2004.4.3

Cited by 10 publications

(24 citation statements)

References 14 publications

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“…Although the KIHA-NE area has never been studied in detail petrologically, there are better-known neighboring metamorphic uplifts. Information concerning the petrologically well-known Jánoshalma High (JH) to the SW (Zachar and M. Tóth 2004;Zachar et al 2007) and the Tázlár (T) area to the NE may be used for comparing results of the entire, relatively small region of the metamorphic basement ( Fig. 1).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Variscan crystalline formations; 8. Unknown basement According to Zachar and M. Tóth (2004) JH is a uniform orthogneiss block with the presence of numerous amphibolite and eclogite enclaves of diverse metamorphic evolutions. Zachar et al (2007) consider that these enclaves are in fact various xenoliths of the original igneous (granitoid) body and represent rock pieces of the mélange zone of an ancient subduction-accretionary complex.…”

Section: Geologic Settingmentioning

confidence: 99%

“…The only eclogite xenolith is characterized by a T ~ 710±10 °C and P ~ 2.6±0.75 GPa peak followed by retrogression during decompression (Zachar et al 2007). The original granitoid intrusion indicates a peraluminous composition and syn-collision origin (Zachar and M. Tóth 2004).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Previous studies of numerous hard rock reservoirs in the Pannonian Basin (Zachar and M. Tóth 2001;Schubert and M. Tóth 2002;M. Tóth et al 2002;Zachar and M. Tóth 2004;M. Tóth and Zachar 2006;Zachar et al 2007) nevertheless pointed out that diverse rock types tend to show significantly different fracture characteristics and therefore reservoir behavior.…”

Section: Introductionmentioning

confidence: 99%

“…There are four basic lithological units in the area. In the lowest structural position orthogneiss is common, which according to its petrographic features is assumed to be identical to the orthogneiss body of the adjacent Jánoshalma (JH) basement high (metamorphic peak temperature T < 580 °C according to Zachar and M. Tóth 2004). The next rock unit upward is the highly mylonitized variety of the orthogneiss with textural features suggesting deformation in an extensional stress regime.…”

mentioning

confidence: 99%

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Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Nagy¹,

Tóth²

2012

Central European Geology

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The Kiskunhalas-NE (KIHA-NE) fractured hydrocarbon reservoir is part of the structurally rather complex crystalline basement of the Great Hungarian Plain. In the course of petrologic and thermometric examinations various rock types of the investigated area have been classified and characterized. There are four basic lithological units in the area. In the lowest structural position orthogneiss is common, which according to its petrographic features is assumed to be identical to the orthogneiss body of the adjacent Jánoshalma (JH) basement high (metamorphic peak temperature T < 580 °C according to Zachar and M. Tóth 2004). The next rock unit upward is the highly mylonitized variety of the orthogneiss with textural features suggesting deformation in an extensional stress regime. In the higher section of the mylonite zone graphitic gneiss mylonite is characteristic, with a peak metamorphic T of 410±45 °C. The lithology in the shallowest position of the area is a graphitic carbonate phyllite, with a T of 375 ± 15 °C. Estimation of the deformation temperature for both mylonitic rocks results in approximately T def~ 455 °C. All data together suggest that between the top (graphitic carbonate phyllite) and the bottom (orthogneiss) of the ideal rock column there is about 200°C peak metamorphic temperature deviation. The two extreme metamorphic blocks probably became juxtaposed along an extensional fault zone in the basement at approximately 15 km depth.

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Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Nagy¹,

Tóth²

2012

Central European Geology

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Integrated core study of a fractured metamorphic HC-reservoir; Kiskunhalas-NE, Pannonian Basin

et al. 2013

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The petrologic interpretation of the coexisting lithologies in the KIHA-NE metamorphic block suggests that two of the four rock units may have a significant role in the migration and/or storage of hydrocarbons. The strongly sheared mylonite samples exhibit remarkable fracture systems with clear evidence of one-time oil migration. In the course of the integrated core study, in addition to the petrological methods, 3D CT scans and destructive and non-destructive rock mechanical treatments were fulfilled on representative samples and evaluated. On the basis of the results we can state that the petrologically different rock types have remarkably different brittle behaviours. The orthogneiss mylonite is characterised by moderate anisotropy and fracture tendency. However, the fractal dimension and cumulative fracture length values do not suggest the formation of complicated and connected fracture systems. High anisotropy and a large and possibly communicating fracture system characterise the graphitic gneiss mylonite, achieved by a much lower work investment than for any other rock type.

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Lithology identification using open-hole well-log data in the metamorphic Kiskunhalas-NE hydrocarbon reservoir, South Hungary

Fiser-Nagy

Varga-Tóth²,

Tóth

2014

Acta Geod Geophys

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Petrology of the metamorphic basement of the Tisza Block at the Jánoshalma High, S Hungary

Cited by 10 publications

References 14 publications

Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Petrology and tectonic evolution of the Kiskunhalas-NE fractured hydrocarbon reservoir, South Hungary

Integrated core study of a fractured metamorphic HC-reservoir; Kiskunhalas-NE, Pannonian Basin

Lithology identification using open-hole well-log data in the metamorphic Kiskunhalas-NE hydrocarbon reservoir, South Hungary

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