Abstract 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.

Abstract Geological and petrophysical research focused on reservoir properties of Upper Jurassic carbonate deposits was carried out in the central part of the Carpathian foreland, also taking into consideration facies development and diagenetic processes. Petrophysical analyses of porosity, permeability (intergranular and fracture), and capillary pressure measurement were conducted on samples from 28 boreholes. Types and ranges of permeability and porosity were correlated with diagenetic processes (such as karst phenomena) on the basis of extracted lithofacies and regional tectonics. The best petrophysical properties are connected with organogenic buildups of the Upper Jurassic rocks. High values of intergranular permeability only occur on this type of rocks. Dual porosity-fracture permeability and fractures dominate other rocks. The karst phenomena improved storage and filtration properties of rocks.