The Largest Hydrocarbon Field Discovered to Date in Hungary: Algyo
Published:January 01, 2006
Imre Magyar, Attila Fogarasi, Gábor Vakarcs, László Bukó, Gábor C. Tari, 2006. "The Largest Hydrocarbon Field Discovered to Date in Hungary: Algyo", The Carpathians and Their Foreland: Geology and Hydrocarbon Resources, Jan Golonka, Frank J. Picha
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The Algyo field is currently one of the largest oil- and gas-producing fields in the Pannonian Basin, Central Europe. Located in the southern part of Hungary, it was discovered in 1965, and it has produced 31 million t of oil and 70 billion m3 (2.47 tcf) of gas. Today, it provides more than half of Hungary's oil production and also holds the largest reserves. The areal extent of the field is about 80 km2 (31 mi2), and it comprises several dozens of sandstone reservoir beds with 5-30 m (16-100 ft) of gross thickness each. The reservoir sands as well as the probable source rocks were deposited in Lake Pannon and in adjacent deltaic and fluvial environments during the late Miocene and earliest Pliocene. Lake Pannon was a huge, long-lived, brackish lake, similar to the modern Caspian Sea. The hydrocarbon traps formed in a compaction anticline above a northwest–southeast-trending metamorphic core complex. A recently shot three-dimensional seismic survey was a milestone for further development and opened new ways for exploration effort, including the use of direct hydrocarbon indicators, to find additional satellite fields in the vicinity of this significant field. Complex interpretation of all available data and using sequence stratigraphy and its chronostratigraphical framework have been tremendously improving our understanding of the mechanisms controlling the reservoir characteristics, facies development, and the oil- and gas-trapping mechanism.
Copyright ©2006. The American Association of Petroleum Geologists.
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The Carpathians and Their Foreland: Geology and Hydrocarbon Resources
This volume of 30 chapters authored by 107 geologists and geophysicists from Austria, Czech Republic, Hungary, Poland, Romania, Slovakia, Ukraine, United Kingdom, and the USA provides a comprehensive and understandable account of geology and hydrocarbon resources of the entire Carpathian system from northeastern Austria to southern Romania, including the Neogene foredeep, the foreland platform both in front and beneath the thrust belt, the Carpathian thrust belt, and the late and post orogenic intermontane basins. Principal chapters on regional geology are supplemented by thematic contributions on geodynamic reconstructions, regional geophysical investigations, hydrocarbon systems, and case studies of major oil and gas fields. To date, close to 7 billion barrels of oil and more than 53 trillion cubic feet of natural gas have been produced from the entire Carpathian system. Additional new reserves may be found, especially at deeper structural levels below the Neogene foredeep and the thin-skinned Carpathian thrust belt. Seventeen chapters of Memoir 84 have been printed in full. The remaining chapters have been printed as abstracts only, with the full paper for all 30 chapters as .pdf files on the CD-ROM in the back of this publication. The publication is intended as a source of information to schools, governmental and private institutions, oil companies, and potential investors.