Fracturing, alteration, and permeability: in-situ properties in Hole 735B

D. Goldberg, C. Broglia, K. Becker

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Geophysical logs recorded over 500m in Hole 735B have been analyzed to identify the in-situ properties and the fracture permeability of basement rocks in the Atlantis II Fracture Zone. Although hydroxyl-bearing alteration minerals were found to be most abundant in the upper section of this hole, the highest permeabilities were also measured in this zone by packer tests. This interval corresponds to the presence of several open fractures imaged by the acoustic televiewer and to indications of fluid flow through transmissive fractures in the log responses. These fractures probably formed as a result of normal faulting on the transform side of the uplifted ridge, where Hole 735B was sited in the Atlantis II Fracture Zone, rather than as a direct result of horizontal plate-tectonic motion. -from Authors

Original languageEnglish (US)
Pages (from-to)261-269
Number of pages9
JournalUnknown Journal
StatePublished - Jan 1 1991
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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