Heterogeneity effects in thermal borehole measurements in the Chicxulub impact crater

Helmut Wilhelm, Yuri Popov, Hans Burkhardt, Jan Šafanda, Vladimir Čermák, Philipp Heidinger, Dimitri Korobkov, Raisa Romushkevich, Sibylle Mayr

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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 a 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 m-2 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 density can be interpreted as thermal noise.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalJournal of Geophysics and Engineering
Volume2
Issue number4
DOIs
Publication statusPublished - 5 Dec 2005
Externally publishedYes

Keywords

  • Heat flow
  • Heterogeneous media
  • Scale dependence
  • Temperature logging
  • Thermal conductivity

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