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Petroleum Potential of the Neogene Within the Pannonian Basin, Hungary

BARDOCZ, B., and J. KOKAI, Hungarian Oil and Gas Trust, Budapest, Hungary, I. KONCZ, Hungarian Hydrocarbon Institute, Budapest, Hungary, K. MOLNAR, G. POGACSAS,* and A. SZALAY, Geophysical Exploration Company, Budapest, Hungary

In the upper Miocene-Pliocene post-rift phase of the evolution of the Pannonian basin, several interconnected interior sags developed accompanying the thermal cooling of the lithosphere.

In the Hungarian part of these interior sags, commercial scale oil and gas production began in 1937. More than 6500 wells were drilled, equivalent to a total of 13 million m combined footage.

In the last few years, several areas in the Pannonian basin were subjected to more detailed and modern exploration than in previous years. Both up-to-date seismic reflection profiling and detailed sedimentological and geochemical analysis guided the drilling of several deep (more than 4000 m) holes. Using results from these key deep wells, seismic-stratigraphic and seismotectonic interpretations were made concerning the evolution of subbasins in the Pannonian basin. Results of these studies indicate that beneath the relatively well-known 3-5 km thick, largely upper Miocene-Pliocene sedimentary fill in the interion sags, several early and Middle Miocene subbasins are present, and that many of these subbasins are wrench-fault controlled. Beneath the Tertiary sedimentary fill, the Mesozo c-Paleozoic basement structure is overthrusted. Potential source rocks are present in the basement (Kossen marl, Veszprem marl, Mecsek black shale). Geochemical modeling of source rock maturation indicates that the Paleozoic-Mesozoic rocks reached the oil window in the Neogene, and these add to the already known Neogene-age hydrocarbon resource potential of the Pannonian basin. Furthermore, seismic-stratigraphic interpretations revealed the characteristics of prodelta-delta plain sequences in the Neogene fill, that also have source rocks associated with them.

The presentation, using seismic profiles and paleogeographic maps, will introduce and discuss the Neogene structural-stratigraphic evolution of the Pannonian Basin in regard to source rocks reservoirs, seals, and traps. Modeling generation and migration of hydrocarbons was used to rank the seismically identified structural and stratigraphic prospects.

Using these new approaches and models, new exploration targets have emerged in the Pannonian basin that may be explored for many more years.


AAPG Search and Discovery Article #91007© 1991 AAPG International Conference, London, England, September 29-October 2, 1991 (2009)