Getting the Hydrocarbon Volumes Right - a Quantitative Use of NMR Data in Water Saturation Modelling

摘要

A saturation model which utilises the NMR bound fluid measurement is proposed for the purpose of calculating the volume of hydrocarbons in a reservoir. In this model the water saturation is split into an irreducible water saturation and a capillary bound water saturation. The irreducible water saturation is derived from the volume of bound fluid as determined by the NMR tools, and the capillary bound water sturation whihc is a height dependant quantity, is derived from capillary pressure data or from log saturations in wells penetrating the transition zone.