1 / 11

GEOPHYSICAL STUDIES SITE B

GEOPHYSICAL STUDIES SITE B. GEOPHYSICAL STUDIES PROGRESS OSPER PROJECT SITE B. BRUCE SMITH ROBERT BISDORF RAY HUTTON MARK TABACHECK ROBERT HORTON. GEOPHYSICAL METHODS USED. DC RESISTIVITY SOUNDING obtain variation in electrical resistivity as a function

tkunz
Download Presentation

GEOPHYSICAL STUDIES SITE B

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GEOPHYSICAL STUDIES SITE B GEOPHYSICAL STUDIES PROGRESS OSPER PROJECT SITE B BRUCE SMITH ROBERT BISDORF RAY HUTTON MARK TABACHECK ROBERT HORTON

  2. GEOPHYSICAL METHODS USED • DC RESISTIVITY SOUNDING • obtain variation in electrical resistivity as a function • of depth (to about 40 meters) • ELECTROMAGNETIC PROFILING (EM31) • obtain variation in electrical conductivity as a function • of position (mapping lateral variations) 3 to 6 meters • TOTAL FIELD MAGNETICS (not discussed) geologic mapping detect magnetic metallic objects (oil field pipes etc.) • ELECTROMAGNETIC PROFILE (EM34…not discussed) • depth to 40m but very noisy due to metallic pipes

  3. DC RESISTIVITY

  4. B SITE LOCATIONDC RESISTIVITY SOUNDINGS

  5. DC SOUNDINGS SITE B

  6. ELECTRICAL CROSS SECTION SITE B RESISTIVITY (ohm meters) CONDUCTIVITY (millisiemens) ρ = 1000/σ(ms) σ(ms) = 1000/ρ 100 ohm meters = 10 ms

  7. WEATHERED BEDROCK RESISTIVITY SOUNDING SITE B CONDUCTIVITY 1000 100 10

  8. EM31 CONDUCTIVITY SURVEY Vertical dipoles depth ~4.5m Horizontal dipoles depth ~2.25m

  9. EM31 HMD 2.25m depth map

  10. EM31 VMD 4m depth map

  11. EM31 HMD 4m 1960 Photo

More Related