terms:secondary_porosity_index
SPI. An estimate of the secondary porosity, calculated from sonic log values in conjunction with either density or neutron log values, or porosity resulting from a crossplot of density and neutron porosities. If fD is the porosity calculated from a density (or neutron) log and fS is the porosity calculated from a sonic log, SPI is sometimes defined as (fD – fS) or (fcrossplot – fS)
terms/secondary_porosity_index.txt · Last modified: 2023/11/22 08:42 by 127.0.0.1