Some Results of a New Magnetotelluric Survey in the Area of the Polish Outer Carpathians
Michał Stefaniuk, 2006. "Some Results of a New Magnetotelluric Survey in the Area of the Polish Outer Carpathians", The Carpathians and Their Foreland: Geology and Hydrocarbon Resources, Jan Golonka, Frank J. Picha
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In 1998, the Geophysical Exploration Company and the State Geological Institute of Poland started broad-scale magnetotelluric (MT) investigation in the Polish Carpathians. The measurements were made with the use of the MT-1 system designed and produced by Electromagnetic Instruments, Inc., over a frequency range of 300-0.0005 Hz, with remote magnetic reference applied. The results of data interpretation provided new elements in the recognition of the structure of the flysch orogen and its basement and confirmed earlier interpretation of the roof of the high-resistivity horizon.
A considerable resistivity differentiation was observed in the Mesozoic, Paleozoic, and Precambrian formations in the northern part of the cross sections, where the high-resistivity platform-type basement occurs beneath the autochthonous Miocene sediments. The zone of low-resistivity rocks occurs in the Outer Western Carpathians. The great differences in resistivity distribution are observed in the deep basement along the general axis of the flysch orogen in the southern part of the study area. The results along two MT sections and from three detail areas are presented. The general features of the Carpathian basement interpreted from MT sounding data are different for the eastern and the western part of the study area. Low-resistivity complex and overthrust zones are characteristic of the eastern part of the area. The geological identification of the low-resistivity layer is still not clear.
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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.