Method and apparatus for multipole acoustic logging
This patent describes a logging tool for use in a borehole traversing an earth formation, the tool having a multiple dipole source connected to the tool in a fixed position and orientation to generate shear wave radiation in multiple directions in the formation upon excitation. It comprises: generating shear wave radiation in a first direction; receiving at each detector at least a portion of the generated shear wave in a second and a third direction; generating shear wave radiation in a fourth direction; receiving at each detector at least a portion of the generated shear wave in a fifth and a sixth direction; determining, for each detector, a composite dipole waveform for azimuthal directions based on at least a portion of the received waveforms in the second, third, fifth and sixth directions received at each detector; determining for each azimuthal direction, a shear wave velocity based on the composite dipole waveforms determined for each azimuthal direction; and obtaining the magnitude and direction of formation anisotropy, relative to the position of the logging tool.
- Assignee:
- Schlumberger Technology Corp., New York, NY (USA)
- Patent Number(s):
- US 4951267; A
- Application Number:
- PPN: US s 6-919293
- OSTI ID:
- 6505484
- Resource Relation:
- Patent File Date: 15 Oct 1986
- Country of Publication:
- United States
- Language:
- English
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