Abstract: Genetic potential of source menilitic shales in Carpathian Mountains: Comparison of results of thermal decomposition tests and well log data

BACZYNSKI, ANDRZEJ, MARIA CIECHANOWSKA, and JAN KUSMIEREK

The menilitic shales are one of the most frequently encountered rocks in older sediments of Oligocene age in Carpathian allochtonic units. Lithology and thickness of these shales are known in numerous outcrops and wells. High genetic potential of these rocks was well documented in recently published papers. It is worth to note the varying maturity of these rocks as well as content and type of kerogen. To evaluate the range of original TOC content, we selected the one layer of menilitic shale characterized by the low degree of maturity of the organic matter.

Results of thermal decomposition tests carried out using Leco and Rock-Eval method (about 200 rock cuttings and cores were used) enabled the precise evaluation of TOC content. Obtained results were used to calibrate the date of sonic logs and electric logs (CARBOLOG). The combined analysis of thermal decomposition date and well log date obtained using the GEO System allowed for the precise scaling of rock maturity and to see how the lithology influence the maturity of rocks.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria