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@article{1411375,
author = {Jirman, Petr and Geršlová, Eva and Kalvoda, Jiří and Melichar, Rostislav},
article_number = {2},
doi = {http://dx.doi.org/10.1111/jpg.12699},
keywords = {basin modelling; vitrinite reflectance; maturity reversal; Rheno-Hercynian Zone; Variscan belt; Czech Republic; thermal maturity; Palaeozoic},
language = {eng},
issn = {0141-6421},
journal = {Journal of Petroleum Geology},
title = {2D Basin Modelling in the Eastern Variscan Fold Belt (Czech Republic): Influence of Thrusting on Patterns of Thermal Maturation},
url = {http://onlinelibrary.wiley.com/doi/10.1111/jpg.12699/full},
volume = {41},
year = {2018}
}
TY - JOUR
ID - 1411375
AU - Jirman, Petr - Geršlová, Eva - Kalvoda, Jiří - Melichar, Rostislav
PY - 2018
TI - 2D Basin Modelling in the Eastern Variscan Fold Belt (Czech Republic): Influence of Thrusting on Patterns of Thermal Maturation
JF - Journal of Petroleum Geology
VL - 41
IS - 2
SP - 175-188
EP - 175-188
PB - Wiley (John Wiley & Sons, Inc.)
SN - 01416421
KW - basin modelling
KW - vitrinite reflectance
KW - maturity reversal
KW - Rheno-Hercynian Zone
KW - Variscan belt
KW - Czech Republic
KW - thermal maturity
KW - Palaeozoic
UR - http://onlinelibrary.wiley.com/doi/10.1111/jpg.12699/full
L2 - http://onlinelibrary.wiley.com/doi/10.1111/jpg.12699/full
N2 - This study evaluates the geothermal history of Palaeozoic sedimentary rocks from the easternmost part of the Variscan external zone in the NE Czech Republic. The objective was to investigate the geothermal history of pre-Variscan Palaeozoic carbonates in the study area, and to assess its relationship with that of the overlying Variscan flysch. In the study area, the Palaeozoic succession occurs at the surface or is overlain by Miocene sediments of the Carpathian Foredeep. Palaeozoic nappes and the main Variscan overthrust have been documented in the subsurface at the deep Potštát-1borehole. Vitrinite reflectance measurements on 38 samples from the Potštát-1 well and 19 samples from nearby surface outcrops and shallow boreholes were available. A 2D thermal model was created using PetroMod and the thermal maturity evolution was modelled by EASY%Ro. The thermal model was constructed based on interpretations of two NW-SE seismic profiles (lines 5/83 and 5/84) oriented perpendicular to the main Variscan thrusts. The results were calibrated using measured vitrinite reflectance and were adjusted with 1D models from three shallow boreholes. At the Potštát-1 borehole, modelled maximum palaeo-temperatures of the Variscan flysch (Moravice Formation) ranged from 310°C at a depth of 7.3 km (the top of the preserved succession) to 395°C at the base of the succession, resulting in thermal maturities of >4%Rr. Peak maturation occurred prior to the end of Variscan thrusting. Modelling suggests that the basal heat flow for these thrust units reached a maximum value of 63 mW/m2 at 325 Ma. In addition, the modelling suggests that the maturity of the Palaeozoic carbonates was controlled by the thickness of the overlying Variscan flysch nappes. Maximum palaeo-temperatures for the Palaeozoic carbonates ranged from 265°C at the top of the interval (at a depth of 7.1 km) to 290°C at the base, resulting in a maturity of 3.8 to >4%Rr which is within the dry gas window. The study suggests that basal heat flows in the original (pre-thrust) Early Carboniferous sedimentary basin were slightly higher than those in the post-thrust location for the Variscan flysch nappes. This should be taken into account when evaluating the petroleum system in the South Moravian oil province (SW Czech Republic) where a complete sedimentary sequence has not been preserved.
ER -
JIRMAN, Petr, Eva GERŠLOVÁ, Jiří KALVODA a Rostislav MELICHAR. 2D Basin Modelling in the Eastern Variscan Fold Belt (Czech Republic): Influence of Thrusting on Patterns of Thermal Maturation. \textit{Journal of Petroleum Geology}. Wiley (John Wiley \&{} Sons, Inc.), roč.~41, č.~2, s.~175-188. ISSN~0141-6421. doi:10.1111/jpg.12699. 2018.
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