Abstract
New seismic data and the completion of the K-1 petroleum exploratory well, located close to the axial zone of the Mogilno-Łódź Trough (Polish Lowlands) delivered new insight into local structural, tectonic, facial and thermal variability of this geological unit. In this paper, the two variants of 3D models (SMV1 and SMV2) of Permian-Mesozoic strata are presented for the salt pillow related Kłecko Anticline, while resources assessment was confined to the Rotliegend Enhanced Geothermal System (EGS) type reservoir, that is divided into Playa, Eolian and Fluvial facies-based complexes. Using very conservative assumptions on the methods of the EGS reservoir development, authors assessed that heat in place and technical potential for eolian sandstones are about 386 PJ and ca. 2814 kW, respectively, and for Fluvial 367 PJ and ca. 2850 kW in relation to the volume of 1 km3 at depths of about 5000 m b.s.l. The authors recommend for the further development of the Eolian complex because of its low shale content, influencing the high susceptibility to fracking. The presented research is the first Polish local resources assessment for an EGS reservoir in sedimentary Rotliegend, within thermal anomaly below the salt pillow, which is one of over 100 salt structures mapped in Poland.
Highlights
Geothermal research started in the Polish Lowland over 40 years ago and has resulted in the discovery of two low-temperature prospecting reservoirs: Lower Cretaceous andLower Jurassic located within Mogilno-Łódź Trough, Szczecin Trough and Warsaw Trough.Based on these results, six geothermal district heating (GeoDH) projects, in various stages of development, have been located
Based on methods described in previous sections, thermal gradient, thermal conductivity, and radiogenic heat production logs for the entire drilled interval were calculated, which allowed for the heat flux estimation
Results approximated by the structural model in the variant 1 (SMV1) models reflect mainly random variability, conditioned with probability density curves of the parameters in Zechstein deposits. They are modified by input from wells located in the southern part of the Fore-Sudetic Monocline (FSM) and in the MogilnoŁódź Trough (MLT)
Summary
Lower Jurassic located within Mogilno-Łódź Trough, Szczecin Trough and Warsaw Trough Based on these results, six geothermal district heating (GeoDH) projects, in various stages of development, have been located. The site favorable for EGS system, located at MLT, north-east of Poznań, Poland was investigated. In this area, Lower Permian sandstones, claystones and mudstones representing Playa, Eolian and Fluvial facies associations being possible target EGS reservoirs were examined. In 2019, in the study area, the K-1 well was drilled as an oil and gas exploratory well It identified a Zechstein salt pillow and provided valuable information on the geology and physical rock properties of Mesozoic and Permian strata.
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