TX 73083.3836, U. S.A., fax OT-972-952-9435. AbstractAn unconventional thin-bed an~ysis based on logs, core and minipem data was needed to calculate the petrophysical properties of a reservoir under development in the Norwegian Sea.More than half of the resenroir section under investigation is composed of heterolithic facies: thinly interbedded sandstone and mudstone layers from one to several centimeters in thickness and of variable quality. By using miniperm measurements with 1-cm spacing on slabbed core, it was possible to resolve the properties of the rock far below the vertical resolution of conventional wireline logs and relate them to the bulk log measurements.