Characterization of the Pore Space of the Carboniferous Gas-bearing Deposits in the P-29 Well (Western Poland)

The paper presents results of mercury injection capillary pressure, nuclear magnetic resonance and gas permeability measurements on samples of Carboniferous sandstones and mudstones from the P-29 well. The well is located in the Variscan zone, in the northern part of the Fore-Sudetic Monocline (western Poland) which represents a prospective area for the occurrence of unconventional hydrocarbon resources. Results of the applied laboratory methods allowed detailed analysis of the pore space geometry and estimation of a number of petrophysical parameters for the analysed Carboniferous rocks. The measurement results build up a picture of rocks with porous type of reservoir space, characterized by the high proportion of micropores and relatively low effective porosity. The insignificant value of permeability (not exceeding 0.1 mD), in combination with the subcapillary nature of the pore space and the large proportion of closed pores, allowed the authors to categorize the analysed samples as potential reservoir rocks for tight gas.