Table 1. Inputs Used for the Calculation of Porosity from the NPHI and RHOB log.

name	unit	description	default value
neutron porosity	v/v	reading the neutron porosity log (limestone porosity units)	obligatory
bulk density	g/cm3	reading bulk density log	obligatory
shale volume	v/v	shale volume (considered moistened as this is an effective porosity computation)	obligatory
true formation resistivity	Ohm/m–1	true resistivity log. required for unflushed zone saturation	elective
flushed zone resistivity	Ohm/m–1	micro resistivity log. required for flushed zone saturation	elective
formation water resistivity	Ohm/m–1	water resistivity of the formation	elective
formation temperature	DegF	temperature of the formation	obligatory
general flag	unitless	bad hole flag, no computation is performed where flag = 1	elective