New Depositional Architecture for an Old Giant: The Matzen Field, Austria
Reinhard Fuchs, Walter Hamilton, 2006. "New Depositional Architecture for an Old Giant: The Matzen Field, Austria", The Carpathians and Their Foreland: Geology and Hydrocarbon Resources, Jan Golonka, Frank J. Picha
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Geophysical, sequence-stratigraphic, and petrophysical evaluation of the main oil and gas reservoirs of the Matzen field in the central Vienna basin resulted in a revised field architecture, and provided new insights into middle Miocene (Badenian, Sarmatian) depositional settings. The latest analysis suggests that the reevaluation of this mature field not only allows a better explanation of production history, but has also led to further successful redevelopment activities.
The structural setting of the Vienna basin is the result of subsidence, extension, and a final phase of subsidence. Compressional, transgressional, and extensional events had a strong influence on the basin configuration and sediment distribution. The Matzen field illustrates these pull-apart and piggyback mechanisms clearly. It is an elongated anticline (Matzen anticline), bounded by a pull-apart graben in the north (Matzen fault system), a fault complex in the west (Bockfliess fault system), and another fault zone in the south (Markgraneusiedl fault zone).
Three depositional cycles (Matzen cycles) have been subdivided into some 30 sequences.
The first Matzen cycle culminates with the transgressive Matzen sand, the main producing horizon in the field.
Produced during the Matzen main cycle (second Matzen cycle), marine prograding delta systems of Badenian age contain the main oil reservoirs. The 9th Tortonian horizon is a textbook example of a shelf-slope basin sucession. Within six sublayers, the shelf edge advances some 2 km (1.2 mi) from north to south. Transgressive meandering channel systems of Sarmatian age hold the main gas reservoirs that are partly used as gas storage. The 5th Sarmatian horizon was deposited in a shallow-marine deltaic setting. During a sea level drop, the depocenter shifted southward with simultaneous incision of a widespread channel system into the underlying 6th Sarmatian horizon. The base of the system represents an important sequence boundary. Final isolation of the Vienna basin created brackish conditions.
The third Matzen cycle developed as a thick series of lacustrine prograding delta sequences of the Pannonian (upper Miocene).
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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.