Method for determining acoustic velocity of earth formations by

Details Method for determining acoustic velocity of earth formations by Method for determining acoustic velocity of earth formations by

1996-11-19

1998-04-14

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 25, 367 32, G01V 140, G01V 136

Patent

active

057401241

ABSTRACT:
A method of determining the acoustic propagation velocities of earth formations using signals generated by an acoustic array well logging instrument. The method includes generating a model of the acoustic velocities including a value of velocity for each propagation mode for which the velocity is to be determined Acoustic waveforms are synthesized for a plurality of receiver locations on the acoustic logging instrument by using the values of the acoustic velocities in the model. A difference is determined between the synthesized waveforms and measured waveforms generated by acoustic energy detected at corresponding receiver locations on the acoustic logging instrument. The model is adjusted and the waveforms are resynthesized until the difference is determined to be at a minimum. The step of adjusting the model is performed by very fast simulated annealing.

REFERENCES:
patent: 4698793 (1987-10-01), Wu
patent: 5197038 (1993-03-01), Chang et al.
patent: 5541890 (1996-07-01), Tang
patent: 5570321 (1996-10-01), Bernitsas
Landa et al, "Reference velocity model estimation from prestack waveforms: Coherency optimization by simulated annealing", Geophysics, V.54, #8, pp. 984-990, Aug. 1989.

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