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Testing the quality of geophone plants for 3-C land acquisition

Testing the quality of geophone plants for 3-C land acquisition. Henry C. Bland, Malcolm B. Bertram, Eric V. Gallant. Conventional surface-mount case. Elevated plants cause cases to sway from side-to-side. Resonant frequencies for vertical geophones in different soils. Location. Location.

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Testing the quality of geophone plants for 3-C land acquisition

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  1. Testing the quality of geophone plants for 3-C land acquisition Henry C. Bland, Malcolm B. Bertram, Eric V. Gallant

  2. Conventional surface-mount case

  3. Elevated plants cause cases to sway from side-to-side

  4. Resonant frequencies for vertical geophones in different soils Location Location Resonant frequency Hz Resonant frequency Hz West Texas 400 400 Friendswood clay Friendswood clay 432 432 Friendswood topsoil Friendswood topsoil 222 222 EPR grounds EPR grounds 305 305 Plowed Houston garden Plowed Houston garden 110 110 Houston lawn near garden 275 275 C.E. Krohn, 1984, Geophone Ground Coupling: Geophysics

  5. 3-C Geophone case styles Oyo Geospace PC-3D Oyo Geospace Seismic Nail I/O Vectorseis

  6. How does geophone plant-depth affect geophone sway?

  7. Retort stand and support grill Geophone Under test Sand Box Experimental apparatus Glass tube Steel ball 3/16” runway

  8. Impulsive Ping Geophone `

  9. On ground 1 cm above ground 2 cm above ground

  10. On ground 1 cm above ground 2 cm above ground

  11. Transmission test

  12. Sourcegeophone Receivergeophone ER ES CS CR x(f) y(f) S ping Geophone coupling transfer function .

  13. y(f) minus x(f) Divide by 2 equals

  14. Conclusions • Geophones must be completely planted loose soils for 3-C • Elevated plants resonate in the data band • Ping technique useful for finding geophone/ground resonances • Possible method for measuring coupling?

  15. Acknowledgements • Oyo Geospace Canada • CREWES Sponsors

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