POSIBILITIES OF QUANTITATIVE EVALUATION OF POLISH SHALE-GAS ROCKS PETROPHYSICAL AND GEOMECHANICAL PARAMETERS BY LABORATORY ANALYTICAL METHODS AND WELL LOGS INTERPRETATION

摘要

The composition of minerals combined with the knowledge about 3D distribution of minerals in the reservoir rock (petrological analysis – detritical grains, cements) and petrophysics translates into its mechanical properties and behavior after application of technologies like hydraulic fracturing - aiming at creating or enhancing the pore connectivity and permeability and therefore enabling the hydrocarbons flow into a well bore. Moreover, the issue regarding resolution improvement is particularly important in the aspect of unconventional hydrocarbon exploration mainly due to reservoir rock revealing micro pore structure. In the paper, comprehensive study of the Polish shale rock formation samples microstructure, combined with mineralogy and its correlation with acoustic velocities measured in frequency domain of MHz, in order to determine and integrate better data input to geomechanical reservoir model was shown. Mercury intrusion, helium pycnometry, argon adsorption are commonly used analytical methods to determine the pore space characteristics in rock samples. Recently FIB/SEM technique, for pore space morphology and its 3D reconstruction, appeared as a method more and more frequently used by leading companies providing geological services. In this work we would like to show integration of nitrogen adsorption method with FIB/SEM data which seems to be powerful tool for shale rock extensive examination. All above mentioned methods should also lead to development of shale rock physical model explaining better well log data for example in terms of X-tended Range Micro Imager (XRMI) results interpretation.