--> Abstract: Stratigraphic Analysis of Seismic and Well Log Data from Carpathian Foredeep Basin--Preliminary Results, by P. Krzywiec; #91012 (1992).

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ABSTRACT: Stratigraphic Analysis of Seismic and Well Log Data from Carpathian Foredeep Basin--Preliminary Results

KRZYWIEC, PIOTR, Jagiellonian University, Krakow, Poland

The Carpathian Foredeep developed during Miocene and migrated toward the north and east together with advancing margin of the Carpathians. It was filled with clastic sediments derived from uplifted orogen. The Middle Badenian salinity crisis resulted in the temporary withdrawal of the sea and deposition of salt and anhydrite.

The study area lies in front of the Carpathian thrust. The main goal of the presented study was to interpret available seismic sections in terms of seismic and sequence stratigraphy. Some additional information was obtained from cores, outcrops and, especially, well log data. On their basis, lithology correlations were completed.

Detailed analysis of 20 time-sections indicated one major angular unconformity, development of which was related to regional post-Middle Badenian transgression. Four seismic facies and two subfacies were distinguished with three downlap surfaces of local extent. Major seismic reflection pattern is prograding oblique (parallel) clinoform. Moreover, seismic data indicate strong tectonic influence of the overthrusting Carpathians. It resulted in the development of strongly folded Miocene sediments in front of overthrust nappes and detachment structures. In some places, basement was involved in these deformations.

All sediments under investigation have been interpreted as deposited in distal parts of prograding, fluvial-dominated delta (delta front and prodelta). Tectonic events led to the development of the local basin characterized by parallel reflections. This basin was controlled by synsedimentary growing diapir structure. Regression during Early Sarmatian resulted in major shift of the shoreline. This regression is evidenced by small scale prograding clinoforms detected on some seismic sections.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)