PETROPHYSICS OF THE COOPER BASIN, SOUTH AUSTRALIA

Abstract

In the Cooper Basin lithologic types can be recognised and related to logging tool response. Empirical relationships between log readings and porosity and permeability can be developed locally by comparing log readings with core data. Water saturation/porosity relationships are found to be convergently hyperbolic. The effects of clay minerals upon water saturation determination show that only in the low porosity range is correction for clay necessary.

A plot of Sw versus Sxo allows prediction of probable test results and has been confirmed by actual Cooper Basin well tests.

An attempt to relate clay content to permeability has been successful in estimating tentative upper limits of permeability. Computer applications to log interpretation are utilized in achieving petrophysical parameters.