Elemental logging with a germanium spectrometer in the Continental Deep Drilling Project

A gamma-ray spectrometer based on a germanium detector is used to obtain elemental concentration logs in three zones of the German Continental Deep Drilling Project pilot hole, with a primary goal of obtaining logs of elements that could not be obtained by commercial logging measurements. Delayed activation measurements provide elemental logs of Na, Mg, Mn, and V. The accuracy of the elemental concentrations is confirmed through comparisons with laboratory XRF (X-ray fluorescence) elemental analyses of cuttings and core samples from the well. These logging measurements provide reliable elemental concentrations that can contribute to the detailed analysis of rock mineral composition