Method for identifying alteration of earth formations using dipo

Details Method for identifying alteration of earth formations using dipo Method for identifying alteration of earth formations using dipo

1996-05-31

1997-08-05

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 28, 367 30, 367 32, 364422, G01V 140

Patent

active

056549385

ABSTRACT:
A method for detecting alteration of earth formations penetrated by a wellbore. The method includes determining a first arrival velocity of dipole acoustic energy propagated through the earth formations. A first frequency dependent velocity of the dipole acoustic energy is then determined. A first dispersion characteristic is determined from the difference between the first arrival and frequency dependent velocities. The method includes determining a frequency dependent velocity and a first arrival velocity for synthesized waveforms for an unaltered formation. The synthesis uses the first arrival velocity of the dipole acoustic energy as a shear velocity. A second dispersion characteristic, related to a difference between the frequency dependent velocity and the first arrival velocity of the synthesized waveforms is determined. The alteration is detected by finding a difference between the first dispersion characteristic and the second dispersion characteristic. In a preferred embodiment, the frequency dependent velocity includes a peak energy velocity determined by waveform matching the receiver signals.

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Tang et al, 62nd Annu. S&G Int. Mtg, pp. 205-208, Oct. 25, 1992; abst. only herewith.

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