Workflow for pore pressure and permeability estimation in unconventional formations

Abstract

A method to perform a field operation of an unconventional reservoir is disclosed. The method includes performing a diagnostic fracture injection test (DFIT) of a formation zone in the unconventional reservoir to generate a DFIT dataset, where each log entry include a decline pressure and a time interval that are measured prior to any radial flow regime occurs in the formation zone during the DFIT, analyzing the DFIT dataset at selected time intervals to generate tabulated entries of estimated permeability versus estimated pressure in the tabulated entries, and determining, prior to said any radial flow regime occurs in the formation zone during the DFIT, a true reservoir permeability in the formation zone by extrapolating the tabulated entries of estimated permeability versus estimated pressure.