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In this article, equation 14 has an error. The correct equation is given. This is a typographical error that does not affect other equations or the results presented in the paper.
- Geophysics > Borehole Geophysics (0.95)
- Geophysics > Gravity Surveying > Gravity Acquisition (0.44)
- Geophysics > Gravity Surveying > Borehole Gravity Surveying (0.44)
Farfield displacement fields have been derived for an impulsive point force acting on a fluidfilled borehole wall under the assumption that the borehole diameter is small compared to the wavelength involved. The displacements due to an arbitrary source can be computed easily by combining the solutions for the impulsive sources. In general, the borehole source generates not only longitudinal and vertically polarized shear waves, but also horizontally polarized shear waves. This study also indicates that only the axisymmetric motion around the borehole due to normal stress is affected by the fluid in the borehole. In the longwavelength limit, the presence of the fluid does not affect the radiation from tangential sources into the surrounding medium.
These are typographical errors which were corrected in the galley proofs, but which were inadvertently omitted from the printed copy of the paper. They do not affect other equations or the results presented in the paper.
This paper concerns farfield radiation of compressional P and shear S waves into the surrounding medium from a fluidfilled borehole in an infinite medium and tube waves propagating along a borehole, using a lowfrequency approximation. Two kinds of sources are considered: 1 a volume displacement point source acting on the axis of a borehole, and 2 a uniform radial stress source acting on the wall of a borehole. When the tubewave velocity is close to the shearwave velocity, the effect of the borehole fluid on the Pwave radiation pattern and on the Swave radiation pattern is substantial.
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Seismic Processing (0.30)
Gustavus E. (Gus) Archie (1907-1978) was a graduate of the University of Wisconsin with degrees in both mining and electrical engineering. His professional career was spent with Shell Oil Company where, as a scientist, engineer, and administrator, he contributed significantly to the science and technology of the oil industry. Archie is perhaps best known for his contributions to petrophysics. The prototype equation relating rock porosity to various electrical properties of rock bears his name: Archie's equation. He played the key role in identification of producible horizons at the giant Elk City Field in Oklahoma, an episode which dramatically demonstrated for the first time the role that well log measurements could play in identifying pay zones.
- North America > United States > Oklahoma > Washita County (0.29)
- North America > United States > Oklahoma > Beckham County (0.29)
- North America > United States > Oklahoma > Anadarko Basin > Elk City Field > M Formation (0.99)
- North America > United States > Oklahoma > Anadarko Basin > Elk City Field > L Formation (0.99)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)