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Thomas LaFehr

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Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-0859
... observations in rugged topography, modifications to reduction procedures were investigated (e.g., Olivier and Hinze, 1986; LaFehr, 1991a, 1991b; Chapin, 1996a; Li and Götze, 2001) and implemented on a limited basis, but they have not been used generally and have not been employed in preparing national and...
Proceedings Papers

Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-0650
... colorado school correction elevation new york Gravity Corrections for Earth Curvature Thomas R LuFehr, Colorado School of Mines GM3.6 SUMMARY The complete Bouguer reduction includes curvature (Bullard B) corrections. A closed-form formula for the curvamre correction is derived for which the...
Proceedings Papers

Paper presented at the 1988 SEG Annual Meeting, October 30–November 3, 1988
Paper Number: SEG-1988-1247
... modeling imaging tomography cross-borehole seismic data ray borehole absolute deviation Tomographic Modeling of a Cross-Borehole Seismic Data Set Larry R. Lines and Edward D. LaFehr, Amoco Production Co. S 21.7 SUMMARY A cross-borehole seismic survey is used to estimate acoustical velocities...
Journal Articles
Petrophysics - The SPWLA Journal of Formation Evaluation and Reservoir Description 37 (04).
Paper Number: SPWLA-1996-v37n4a4
Published: 01 July 1996
... the rock to be measured directly (LaFehr et al., 1979; Beyers, 1991). This technique leads to a serics of gravity differencc ( A g ) and depth difference (Ah) incasurements that constitute the vertical gradient of grav- ity (AgiAh) between successive stations (Figure 6). The fundamental equation of...
Proceedings Papers

Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-0829
... information from the direct arrivals of crosswell seismic data (Bois et al., 1972; Ivansson, 1985; Peterson et al., 1985; Bregman et al., 1989; Lines and LaFehr, 1989; Lines and Tan. 1990: Stewart. 1990). However, most of current tomographic .techniqu& invblve time-consuming hand-nicking of traveltimes. When...
Proceedings Papers

Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-0034
...) Bregman et al. (19891, Justice et al. (1989), and Lines and LaFehr (1989). In addition to velocity estimation, it is also possible to use borehole gravity meter (BHGM) surveys to estimate densities in the vicinity of the borehole (Lines, et al., 1988). Combined velocity- density interpretations provide...
Journal Articles
Petrophysics - The SPWLA Journal of Formation Evaluation and Reservoir Description 19 (03).
Paper Number: SPWLA-1978-vXIXn3a2
Published: 01 May 1978

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