HR: 15:00h
AN: U33A-05    [Abstracts]
TI: Heterogenity Effects In Thermal Borehole Measurements In The Chicxulub Impact Crater
AU: Wilhelm, H
EM: helmut.wilhelm@gpi.uni-karlsruhe.de
AF: Geophysical Institute University of Karlsruhe, Karlsruhe, Karlsruhe, Germany
AU: Popov, Y
AF: Moscow State Geological Prospecting University, Moscow, Moscow, Russian Federation
AU: Burkhardt, H
AF: Institute of Applied Geosciences Technical University of Berlin, Berlin, Berlin, Germany
AU: Safanda, J
AF: Geophysical Institute Czech Academy of Sciences, Prague, Prague, Czech Republic
AU: Cermak, V
AF: Geophysical Institute Czech Academy of Sciences, Prague, Prague, Czech Republic
AU: * Heidinger, P
EM: heidinger@gmx.net
AF: Geophysical Institute University of Karlsruhe, Karlsruhe, Karlsruhe, Germany
AU: Korobkov, D
AF: Moscow State Geological Prospecting University, Moscow, Moscow, Russian Federation
AU: Romushkevich, R
AF: Moscow State Geological Prospecting University, Moscow, Moscow, Russian Federation
AU: Mayr, S
AF: Institute of Applied Geosciences Technical University of Berlin, Berlin, Berlin, Germany
AB: Boreholes drilled in impact structures are especially suited for investigations of the influence of heterogeneities on petrophysical properties and thermal field. In the scientific well Yaxcopoil-1 drilled within the frame of the International Continental Deep Drilling Program (ICDP) and as part of the Chicxulub Scientific Drilling Project (CSDP) high resolution temperature measurements and a dense petrophysical profile measured on core samples at ~2.2 m depth intervals were recorded. From the calculated vertical component of the thermal gradient and the thermal conductivity measured on the core samples a mean heat flow density of 70.5 +/-1.9 mW/m2 in the depth interval 400 - 1400 m was determined. On the basis of a simple purely conductive heterogeneous 2D thermal model the effect of the refraction of heat caused by heterogeneities is demonstrated. A statistical investigation shows that if the scales of the heterogeneities influencing the values of the measured thermal conductivity and the calculated thermal gradient are small compared to the length of the borehole the effect of the heterogeneities on the vertical heat flow densitiy can be interpreted as thermal noise. Additionally a local 2D profile was modelled to explain the large scale features of the measured temperature profile.
DE: 0905 Continental structures (8109, 8110)
DE: 0999 General or miscellaneous
DE: 3999 General or miscellaneous
SC: Union [U]
MN: 2007 Joint Assembly