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Hellenic Petroleum: 100% (operator)
Block 10 is located in the offshore Western Peloponnese, specifically within the Kyparissiakos Gulf, lying between Strofades islets and Peloponnese.
The hydrocarbon shows in the area attracted the interest of oil companies and the Hellenic Government in 1938 and several shallow wells were drilled before the 2nd World War. During the next years, several seismic campaigns of poor quality were acquired, as well as geological and geophysical studies. The old legacy seismic data have a rather dense coverage to the east, but most of the lines lie outside the borders of the block. Within the block exists a very sparse network of legacy seismic lines that were acquired between 1979-1982.
Western Greece belongs to the Alpine orogenic system. In particular its southern branch includes the Apennines, the Southern Alps, the Dinarides, the Hellenides and the Taurides, delineating the northern margin of the East Mediterranean. This mountainous chain was formed as result of the closure of the Tethys Ocean due to the collision between the Eurasian continent in the north, with African (Apulian) plate in the south. Collision began in Late Cretaceous–Early Eocene times and continued throughout the Tertiary with westward prograding intercontinental deformation. The result of the Alpine orogenesis in the Tertiary was the so-called ‘External Hellenides’, representing a west verging fold-and-thrust belt consisting of NNW-SSE striking thrust sheets.
The Ionian zone is characterized by the predominance of pelagic facies for an extended time period; in particular from Middle Jurassic to early Miocene. Moreover, the Ionian zone changed its paleogeographic character from neritic to pelagic at the end of Early Jurassic, contrary to the neighbor isopic zones such pre-Apulian and Gavrovo, which remained shallow platforms during Mesozoic. The nature of the sediments below the evaporites remains unknown so far.
Several oil and gas fields have been discovered in Albania, which belong to the same fold-and-thrust belt having the same geological characteristics. The presence of a working petroleum system in Western Greece is proven by the discovery of West Katakolo oilfield, situated very close to the block area.