This paper presents a broad overview of laboratory methods for measuring thermal properties and petrophysical parameters of carbonate rocks, and analytical methods for interpreting the obtained data. The investigation was conducted on carbonate rock samples from the Kraków region of Poland in the context of shallow geothermal potential assessment. The measurement techniques used included standard macroscopic examinations; petrophysical investigations (porosity, density); analysis of mineral composition thermal conductivity (TC) and specific heat measurements; and advanced investigations with the use of computed tomography (CT). Various mathematical models, such as layer model, geometric mean, and spherical and non-spherical inclusion models, were applied to calculate thermal conductivity based on mineralogy and porosity. The aim of this paper was to indicate the optimal set of laboratory measurements of carbonate rock samples ensuring sufficient characterization of petrophysical and thermal rock properties. This concerns both the parameters directly characterizing the geothermal potential (thermal conductivity) and other petrophysical parameters, e.g., porosity and mineral composition. Determining the quantitative relationship between these parameters can be of key importance in the case of a shortage of archival thermal conductivity data, which, unlike other petrophysical measurements, are not commonly collected. The results clearly show that the best correlations between calculated and measured TC values exist for the subgroup of samples of porosity higher than 4%. TC evaluation based on porosity and mineral composition correlation models gives satisfactory results compared with direct TC measurements. The methods and results can be used to update the existing 3D parametric models and geothermal potential maps, and for the preliminary assessment of geothermal potential in the surrounding area.

SUMMARYDuring development of sedimentary basin, pore space of sandstones undergo transformations related to diagenetic stages. These processes include compaction, cementation, dissolution, replacement and recrystalisation, and become more and more advanced with depth. This interactions amends primary porosity, leading to deterioration of reservoir properties. The paper presents diagenetical changes occurred within deeply buried tight Rotliegend sandstones from Polish part of Southern Permian Basin and its impact on reservoir properties

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The aim of this study is to estimate total gas-in-place volumes for the Lower Paleozoic shale rocks, in part the Baltic Basin of northern part of Poland. For one of the projected horizontal well in Poland, the investigation was carried out. Based on published and literature date the authors built 3D static model which consist structural and parametric data needed for volumetric calculation. The input data include porosity, density, water saturation. The calculations for Polish conditions were compared with production data from North America and China. The analysis were provided for four examples. Based on available data and provided analysis of gas reserves for a single, depending on the fracking results, that the GIIP are changing. The quality and number the input data used to volumetric calculations plays a very big difference on gas resources. Graphics comparison between minimal Canadians and Polish , maximal Chinese (Longmaxi) and USA (Barnett Shale) shows statistical data.

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