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.
Highlights
Unconventional hydrocarbon deposits are very important components of the natural energy resources
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
Summary
Unconventional hydrocarbon deposits (shale oil and gas, tight gas, coal-bed-methaneCBM 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. 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].
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