  We describe the observations and preliminary results of the gas-phase
analysis based on two ongoing, wide-field Integral Field Spectroscopy (IFS)
surveys: the PPAK IFS Nearby Galaxies Survey (PINGS), targeting disc galaxies;
and the VIMOS-IFU observations of low-z (Ultra)Luminous Infrared Galaxies
(U-LIRGs), the local counterpart of massive, dusty high-z star-forming
galaxies. We describe how these observations are allowing to discover and
characterise abundance differentials between galactic substructures and
differences depending on the morphologically/dynamically distinct types of
objects, which in turn will allow us to interpret the gas-phase abundances of
analogue high-z systems.
