Patent ID: 6791899
Filing Date: 2004-09-14
Classification: G01V

Abstract:
In a system with a logging tool having a dipole transmitter pair and a plurality of dipole receiver pairs spaced apart from the dipole transmitter pair and from each other, and where the orientation of each dipole transmitter is known, and where each of the plurality of dipole receiver pairs has one dipole receiver axially parallel with one of the dipole transmitters and another dipole receiver axially parallel with another of the dipole transmitters, a method of determining a velocity of a fast and slow shear wave polarizations in an anisotropic earth formation comprising:transmitting acoustic signals with the dipole transmitters; receiving the acoustic signals as composite signals with the plurality of dipole receiver pairs; decomposing the composite signals into a plurality of decomposed signals; estimating a source signal for each of the plurality of decomposed signals to create a plurality of estimated source signals; and determining the acoustic velocity of the fast and slow polarized shear waves by comparison of the plurality of estimated source signals.