Methods for determining formation and borehole parameters via tw

Details Methods for determining formation and borehole parameters via tw Methods for determining formation and borehole parameters via tw

1991-03-06

1992-01-14

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 27, 364422, G01V 140

Patent

active

050816110

ABSTRACT:
Methods are provided for determining the axial and radial slowness of a formation traversed by a borehole via utilization of sonic data obtained from a sonic borehole tool having a plurality of detectors. The methods utilize first arrival time information, ray tracing techniques, and backprojection techniques. The differences between the actually measured first arrival times and the theoretical first arrival times as calculated by ray tracing through an initial slowness model of the formation, are backprojected along the theoretical ray paths of first arrival in order to modify the initial slowness model of a formation. The methods utilized are preferably iterative, such that the modified slowness model is then utilized for additional ray tracing and backprojection. Secondary arrivals may also be utilized to refine slowness determinations made from first arrival information.

REFERENCES:
patent: 4468623 (1984-08-01), Gianzero et al.
patent: 4594691 (1986-06-01), Kimball et al.
patent: 4755944 (1988-07-01), Glass
patent: 4809236 (1985-02-01), Hsu et al.
patent: 4817059 (1989-03-01), Hornby et al.
patent: 4870627 (1989-09-01), Hsu et al.
"Geophysical Imaging with Backprojection and Zeroth Order Phase Approx.," Geophysical Research Letters, vol. 17, #6, May 1990, pp. 673-676.
"Semblance Processing of Borehole Acoustic Array Data" by Kimball and Marzetta, Geophysics, vol. 49, No. 3, Mar. 1984, pp. 274-281.
"Estimating Slowness Dispersion From Arrays of Sonic Logging Waveforms" by Lang et al., Geophysics, vol. 52, No. 4, Apr. 1987, pp. 530-544.

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