Based on the assumption that diversifiedfluids can be trapped in inclusions present in the rock cements of sedimentary basins, fluid inclusion studies were undertaken in the wells of the Barnówko-Mostno-Buszewo oil and gas field (western Poland). Sampling was conducted in six wells, and most samples studied lie at a depth interval of 3100 to 3150 m. Methods applied in the present study stage comprised: standard petrography, microscopic analysis of fluid inclusions, fluorescence studies and some introductory microthermometric measurements. Three types of fluid inclusions were observed and studied: two-phase aqueous (brine) inclusions (non-fluorescent); two-phase oil inclusions (fluorescent); one-phase methane inclusions (non-fluorescent). These inclusions display either a primary or a secondary character. Their abundance and detailed characteristics differ depending on the type of mineral, well and depth position.
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