Petrophysical Investigations of Shale Gas Formations in Poland Jarzyna J A*, Krakowska-Madejska P I, Puskarczyk E and Wawrzyniak-Guz K AGH University of Science and Technology, Faculty of Geology Geophysics and Environmental Protection, Department of Geophysics, Poland Introduction Unconventional hydrocarbon deposits (shale oil and gas, tight gas, coal-bed-methane- CBM and gas hydrates) are very important components of the natural energy resources. They are under detailed investigations in many countries all over the world and intensity of the research works depends on economy state in the hydrocarbon prospecting industry and politics, which nowadays is mostly oriented to renewable energy resources. Poland, with relatively low resources of hydrocarbon, is extremely interested in detailed recognition of the Paleozoic shales with gas observed from the primary drillings in the Baltic, Podlasie and Lublin Basins as potential shale gas resources [1-5]. Geological setting The Silurian and Ordovician shale formations in the north-eastern and central-eastern Poland are observed along the margin of the East European Platform. The analysis was focused on two formations in the Baltic Basin: Ordovician Sasino Formation (Sa Fm) and Jantar Member (Ja Mb) of the Silurian Pasłęk Formation as potential resources of unconventional hydrocarbons [1,4,5]. The discussed formations are composed of black, dark gray, and gray- greenish bituminous shales. Average TOC values of Sa Fm and Ja Mb are 3.1 and 3.0 wt.%, respectively. Depth of occurrence is between 2800-3200m. Materials and Methods The Silurian and Ordovician formations are heterogeneous due to geological, sedimentological, mineralogical, geochemical, and petrophysical parameters. Results of well logs suffer additionally from the influence of factors related to the construction of logging devices. So, combining the point type laboratory results and continuous well logging Crimson Publishers Wings to the Research Research Article *Corresponding author: Jadwiga A Jarzyna, AGH University of Science and Technology and Faculty of Geology Geophysics and Environmental Protection, Department of Geophysics, Krakow, Poland Submission: July 06, 2020 Published: August 12, 2020 Volume 5 - Issue 3 How to cite this article: Jarzyna J A, Krakowska-Madejska P I, Puskarczyk E, Wawrzyniak-Guz K. Petrophysical Investigations of Shale Gas Formations in Poland. Aspects Min Miner Sci. 5(3). AMMS. 000611. 2020. DOI: 10.31031/AMMS.2020.05.000611 Copyright@ Jarzyna JA, This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use and redistribution provided that the original author and source are credited. ISSN: 2578-0255 Aspects in Mining & Mineral Science 582 Abstract Results of laboratory experiments and well logging processing and interpretation are described to show the investigation trial realized on the Polish Silurian and Ordovician shale gas deposits in the Baltic Basin, north Poland. Standard and sophisticated laboratory methods of density, porosity, permeability, mineral composition and geochemical parameters measurements on rock samples were performed. Statistical methods were applied to standard, dipole sonic and geochemical well logs to limit the processed data without loss of useful petrophysical information, avoiding redundancy and doing the primary classification. The goal of this specific trial was to build petrophysical model of shale gas rocks taking into account low porosity, very low permeability, TOC equal at least 2 wt.% and organic matter as a kerogen and bitumen, free gas gathered in the rock matrix effective porosity and in secondary porosity. The unique model for the Polish shale gas formations is explained by age, depth of occurrence and mineral composition of the Silurian and Ordovician shales, different from those described in the literature. Keywords: Silurian and Ordovician shale gas formation; Baltic basin; Poland