The Algyő Turbidite Gas Play in the Makó Trough, Pannonian Basin, Hungary

Authors: G. Bada, E. Dombrádi, A. Horányi, G. Molnár (Falcon-TXM Oil and Gas Exploration Ltd., Hungary, Budapest), Orsolya Sztanó (Falcon-TXM Oil and Gas Exploration Ltd, Hungary, Budapest, Eötvös Loránd University, Hungary, Budapest), Mikhil Shevelev (NIS Gazpromneft & Pannon Naftagas Kft., Hungary, Budapest)

Key words: gas sand, seismic attributes, turbidite, Miocene, Pannonian basin.

The Algyő gas play in the Makó Trough, Pannonian basin, in south-eastern part of Hungary represents a Miocene petroleum system where turbiditic sandstone reservoirs are charged from the underlying mature lacustrine dark shales as source rocks and sealed by the overlying uniform slope shales. Recognition of stratigraphic traps within various types of turbidites was based on high-resolution 3D seismic geomorphology, mapping of numerous seismic attributes and AVO analysis. The presence of a series of 10-50 m thick, gas bearing slope detached sandy lobes and turbidite channels is validated by the Kútvölgy-1 well drilled in the summer of 2013.

References
1. Brczi I., Phillips R.L., Process and depositional environments within
Neogene deltaic-lacustrine sediments, Pannonian Basin, Southeast
Hungary. Geophysical Transactions, 1985, V. 31, pp. 55-74.
2. Horvth F., Royden L., Mechanism for formation of the intra-
Carpathian basins: a review, Earth Evolution Science, 1981, V. 1,
pp. 307-316.
3. Horvth F., Cloetingh S., Stress-induced late-stage subsidence anomalies
in the Pannonian basin, Tectonophysics, 1996, V. 266, pp. 287-300.
4. Horvth F., Tari G., IBS Pannonian basin project: a review of the main
results and their bearings on hydrocarbon exploration, In: Durand, B.,
Jolivet, L., Horvth, F., Sranne, M., (Eds.), The Mediterranean basins:
Tertiary extension within the Alpine orogen. Geological Society London
Special Publications, 1999, V. 156, pp. 195-213.
5. Magyar I., Geary D.H., Mller P., Paleogeographic evolution of the
Late Miocene Lake Pannon in Central Europe. Palaeogeography,
Palaeoclimatology, Palaeoecology, 1999, V. 147, pp. 151-167.
6. Magyar I., Fogarasi A., Vakarcs G., Buk L., Tari G.C., The largest hydrocarbon field discovered to date in Hungary: Algy. In: Golonka, J.,
Picha, F.J., (Eds.), The Carpathians and their foreland: geology and hydrocarbon
resources, AAPG Memoir, 2006, V. 84, pp. 619-632.
7. Magyar I., Radivojevi D., Sztan O., Synak R., Ujszszi K., Pcsik M.,
Shelf-margin progradation across the Pannonian basin in the Late
Miocene and Early Pliocene. Global and Planetary Change, 2013,
V. 103, pp. 168-173.
8. Partyka G., Gridley J., Lopez J., Interpretational applications of spectral
decomposition in reservoir characterization. The Leading Edge,
1999, V. 18, 353-360.
9. Sztan O., Szafin P., Magyar I., Hornyi A., Bada G., Hughes D.W.,
Hoyer D.L., Wallis R.J., Aggradation and progradation controlled
clinothems and deep-water sand delivery model in the Neogene Lake
Pannon, Mak Trough, Pannonian Basin, SE Hungary, Global and Planetary
Change, 2013, V. 103, pp. 149-167.
10. Tari G., Dvnyi P., Dunkl I., Horvth F., Lenkey L., Stefanescu M.,
Szafin P., Tth T., Lithospheric structure of the Pannonian basin derived
from seismic, gravity and geothermal data, In: Durand, B., Jolivet,
L., Horvth, F., Sranne, M., (Eds.), The Mediterranean basins: Tertiary
extension within the Alpine orogeny, Geological Society London Special
Publications, 1999, V. 156, pp. 215-250.
11. Young R.A., LoPiccolo R., A comprehensive AVO classification, The Leading Edge, 2003, V. 22(10), pp. 1,030-1,037.

Key words: gas sand, seismic attributes, turbidite, Miocene, Pannonian basin.

The Algyő gas play in the Makó Trough, Pannonian basin, in south-eastern part of Hungary represents a Miocene petroleum system where turbiditic sandstone reservoirs are charged from the underlying mature lacustrine dark shales as source rocks and sealed by the overlying uniform slope shales. Recognition of stratigraphic traps within various types of turbidites was based on high-resolution 3D seismic geomorphology, mapping of numerous seismic attributes and AVO analysis. The presence of a series of 10-50 m thick, gas bearing slope detached sandy lobes and turbidite channels is validated by the Kútvölgy-1 well drilled in the summer of 2013.

References
1. Brczi I., Phillips R.L., Process and depositional environments within
Neogene deltaic-lacustrine sediments, Pannonian Basin, Southeast
Hungary. Geophysical Transactions, 1985, V. 31, pp. 55-74.
2. Horvth F., Royden L., Mechanism for formation of the intra-
Carpathian basins: a review, Earth Evolution Science, 1981, V. 1,
pp. 307-316.
3. Horvth F., Cloetingh S., Stress-induced late-stage subsidence anomalies
in the Pannonian basin, Tectonophysics, 1996, V. 266, pp. 287-300.
4. Horvth F., Tari G., IBS Pannonian basin project: a review of the main
results and their bearings on hydrocarbon exploration, In: Durand, B.,
Jolivet, L., Horvth, F., Sranne, M., (Eds.), The Mediterranean basins:
Tertiary extension within the Alpine orogen. Geological Society London
Special Publications, 1999, V. 156, pp. 195-213.
5. Magyar I., Geary D.H., Mller P., Paleogeographic evolution of the
Late Miocene Lake Pannon in Central Europe. Palaeogeography,
Palaeoclimatology, Palaeoecology, 1999, V. 147, pp. 151-167.
6. Magyar I., Fogarasi A., Vakarcs G., Buk L., Tari G.C., The largest hydrocarbon field discovered to date in Hungary: Algy. In: Golonka, J.,
Picha, F.J., (Eds.), The Carpathians and their foreland: geology and hydrocarbon
resources, AAPG Memoir, 2006, V. 84, pp. 619-632.
7. Magyar I., Radivojevi D., Sztan O., Synak R., Ujszszi K., Pcsik M.,
Shelf-margin progradation across the Pannonian basin in the Late
Miocene and Early Pliocene. Global and Planetary Change, 2013,
V. 103, pp. 168-173.
8. Partyka G., Gridley J., Lopez J., Interpretational applications of spectral
decomposition in reservoir characterization. The Leading Edge,
1999, V. 18, 353-360.
9. Sztan O., Szafin P., Magyar I., Hornyi A., Bada G., Hughes D.W.,
Hoyer D.L., Wallis R.J., Aggradation and progradation controlled
clinothems and deep-water sand delivery model in the Neogene Lake
Pannon, Mak Trough, Pannonian Basin, SE Hungary, Global and Planetary
Change, 2013, V. 103, pp. 149-167.
10. Tari G., Dvnyi P., Dunkl I., Horvth F., Lenkey L., Stefanescu M.,
Szafin P., Tth T., Lithospheric structure of the Pannonian basin derived
from seismic, gravity and geothermal data, In: Durand, B., Jolivet,
L., Horvth, F., Sranne, M., (Eds.), The Mediterranean basins: Tertiary
extension within the Alpine orogeny, Geological Society London Special
Publications, 1999, V. 156, pp. 215-250.
11. Young R.A., LoPiccolo R., A comprehensive AVO classification, The Leading Edge, 2003, V. 22(10), pp. 1,030-1,037.
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