Well log-derived estimates of thermal conductivity in crystalline rocks penetrated by the 4-km deep KTB Vorbohrung

Details Well log-derived estimates of thermal conductivity in crystalline rocks penetrated by the 4-km deep KTB Vorbohrung Well log-derived estimates of thermal conductivity in crystalline rocks penetrated by the 4-km deep KTB Vorbohrung

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1155p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 12, p. 1155-1158.

Physics

6

Crystallinity, Earth Crust, Heat Transmission, Rocks, Thermal Conductivity, Comparison, Mineralogy, Physical Properties

Scientific paper

Well log measurements of compressional and shear velocity (Vp, Vs), density, and temperature from the 4 km-deep KTB Vorbohrung (pilot hole) were applied in a phonon conduction model for the thermal conductivity of a crystalline solid. The resulting conductivity estimates were compared with conductivities (kLAB) measured on the nearly continuous core. Previous studies have shown the log-derived conductivity (kLOG) to be within +/- 15 percent of KLAB in isotropic or flat-lying anisotropic crystalline rocks. The section penetrated by the KTB pilot hole includes both predominantly isotropic metabasites and highly anisotropic gneisses with foliation dips ranging from horizontal to vertical. The predictions of the phonon model were accurate within +/- 4 percent in the metabasites but inaccurate by as much as 23 percent in the gneisses. The accuracy of the model in the metabasites confirms the utility of the phonon conduction approach in isotropic or weakly anisotropic rocks, but the discrepancies in the anisotropic gneisses remain unexplained. If the discrepancies can be tied to errors in sonic log Vs measurements, the phonon conduction model may provide a tool for deriving thermal conductivity profiles of the Earth's crust from seismic studies of Vp and Vs.

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