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Evaluation of undeveloped hard coal deposits and estimation of hard coal reserves in the Upper Silesian Coal Basin, Poland

Urych Tomasz, Chećko Jarosław, Rosa Marek, Wątor Anna

Journal of Sustainable Mining

2020

Vol. 19, iss. 4

230--242

The article presents the results of works concerning evaluation of undeveloped deposits in the Upper Silesian Coal Basin and an estimation of hard coal reserves which can be developed by 2050. Evaluation of hard coal deposits was established on criterions choice and their score determination. On the basis of obtained the final score and after consultations with experts in the field of hard coal mining, there were selected three areas of undeveloped deposits with the amount of about 1.99 Gt (billion metric tons) of anticipated economic resources which can extend the coal reserve base located in the direct vicinity of operating hard coal mines. Additionally, one undeveloped coal deposit with estimated resources amounts to about 1.15 Gt was selected as a potential deposit whose resources could be included in the reserves of operating mines, up to the depth of 1,500 metres. Deposit areas were selected and hard coal reserves were estimated with a view to building new coal mines. For Oświęcim-Polanka deposit, there was built a 3D geological model with estimated the amount of 924 Mt (million metric tons) of anticipated economic resources of coal. An example of a deposit development with ventilation, extraction and transport/haulage underground roadways connecting coal seams with the surface are presented. The designed mine working was placed in the 3D geological deposit model which is a useful tool for designing spatial deposit management.

Static 3D model of the Rotliegend deposits - case study from natural gas field area, Fore-Sudetic Monocline, Western Poland

Ząbek G.

Geology, Geophysics and Environment

2012

Vol. 38, no. 4

555--556

The "Z" natural gas field is located in the southern part of the Fore-Sudetic Monocline, in the western part of Poland. Rotliegend sandstones, characterized by good reservoir properties are located in the Polish part of the Southern Permian Basin (Gast et al. 2010). The "Z" gas deposit was discovered in 1978. Reservoir "Z" structure is a regular, oval brachyanticline. The culminations are separated by a shallow depression in which the top of Rotliegend complex is located at depth somewhat less than - 1275 m bsl. Massive type accumulation covers about 25 km and shows a height up to about 105 m (Karnkowski 1999). 3D static modelling was performed using Petrel software from Schlumberger. Typical workflows for modelling of oil and gas reservoirs were applied (e.g. Zakrevsky 2011). Structural model was created by 100 m x 100 m grid increment. Ten proportional layers of reservoir zone were set resulting in model composed of over 1,000,000 cells. The base case model assumed gas/water contact at 1345 m bsl. These models were result of geostatistical simulation based on Kriging technique. The quality and number of the input data used to develop parametric models play a major role. The most important parameters characterizing the reservoir rocks are: porosity, permeability and shale volume (vshale). Average petrophysical parameters based on base case model in the area are: 15% for porosity, 45 mD for permeability and 14% for vshale. Performed structural-parametric models of the Żuchlów gas field can be successfully used for dynamic simulation and reserves estimation.