A 3D model of the thermal field within the Polish Carpathians and the Carpathian Foredeep (S Poland)

Abstract

Nu mer i cal 3D para met ric mod els of tem per a ture and ther mal gra di ent dis tri bu tion within the Pol ish Carpathians and the Carpathian Foredeep are con structed for the in ter val be tween ground level and the 160°C iso therm. The model con struc tion was pre ceded by de tailed anal y sis of over 500 ther mal logs from the area in ves ti gated and its clos est vi cin ity. This anal y sis showed that the ver ti cal changes in tem per a ture and ther mal gra di ent have a non-lin ear char ac ter with no reg u lar pat tern in the dis tri bu tion of the pa ram e ters mod elled, so a 3D mod el ing ap proach was cho sen as the most ap pro pri ate method for their quan ti ta tive de scrip tion. Fur ther more, stan dard iza tion of the ther mal logs was rec og nized as man da tory so the in flu ence of drill ing pro cess would be elim i nated. Among a broad ar ray of meth ods and their pre con di tions dis cussed, the Kukkonen-Szewczyk method was se lected for the data col lected in the study area. Mod el ing re sults show a close re la tionship be tween ther mal gra di ent, li thol ogy and petrophysical rock prop er ties as well as a cor re la tion be tween the dis tri bu tion of pos i tive ther mal anom a lies and yield of hy dro car bon ac cu mu la tions within the Carpathian Foredeep. The ac cu racy of the model has been as sessed as ~10%. The model was then used for dis cus sion of hy dro car bon gen er a tion and pre dic tion of for ma tion tem per a ture.

Subsalt Rotliegend Sediments—A New Challenge for Geothermal Systems in Poland

“…In the K-1 well the thermal logging was performed in the perturbed conditions in several runs. The logs were combined into a composite, standardized to the quasi-equilibrium conditions with the application of method described by Kudrewicz [119], and calibrated by DST results. The standardized composite log was then used for determination of the thermal gradient log, which was computed by a differentiation of the thermal log.…”