Interpretation of pressure test data

A method comprising:

• positioning a downhole apparatus within a wellbore penetrating a subterranean formation;
• operating the downhole apparatus to obtain pressure test data at a plurality of different-depth stations;
• transferring the pressure test data obtained at the plurality of different-depth stations to a processing system comprising a processor and a memory including computer program code;
• and
• operating the processing system to determine a model value of at least one station-specific parameter, at least one station-shared parameter, or a combination thereof, wherein operating the processing system comprises:
• obtaining initial settings of the station-specific parameters, wherein:
• the station-specific parameters are descriptive of wellbore/formation properties each specific to one of the plurality of different-depth stations at which the pressure test data is obtained by the downhole apparatus;
• and
• each wellbore/formation property is:
• a property of the wellbore proximate the corresponding station;
• or
• a property of the subterranean formation proximate the corresponding station;
• obtaining initial settings of the station-shared parameters;
• wherein:
• the station-shared parameters are descriptive of petrophysical properties of each of a plurality of petrophysically unique zones of the subterranean formation;
• and
• the pressure test data at each of the plurality of different-depth stations is influenced by the petrophysical properties of at least two of the zones;
• and
• developing a pressure transient model of the collective zones by performing regression analysis utilizing the pressure test data of each of the plurality of different-depth stations simultaneously, the initial settings of the station-specific parameters, and the initial settings of the station-shared parameters, wherein:
• the pressure transient model is based on the station-specific parameters and the station-shared parameters;
• and
• the regression analysis analytically determines a model value of at least one of the station-specific parameters and the station-shared parameters.