Method and apparatus for determining acoustic wave parameters from acoustic well logging waveforms

Patent · Tue Dec 31 04:00:00 EST 1985

OSTI ID:5675392

Parks, T W; Morris, C F

Methods and apparatus are described for estimating parameters, such as slowness and attenuation, of composite acoustic waves obtained in the course of sonic logging of formations traversed by a borehole. Sonic energy is sensed arriving at a plurality of points spaced vertically along the borehole after refraction, reflection and direct transmission through and along the formations. A window is established of predetermined length and moveout and the composite waves are multiplied by the window. A Fourier transform is obtained of the windowed data and the data are simultaneously analyzed to obtain an estimate of the parameters. The procedure is repeated for different window moveouts and index positions along the composite waves. The analysis is performed at each window position and moveout to obtain the best estimate of the parameters.

• Assignee: Schlumberger Tech. Corp.
• Patent Number(s): US 4562557
• OSTI ID: 5675392
• Country of Publication: United States
• Language: English

Related Subjects

440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
DESIGN
EQUIPMENT
FOURIER TRANSFORMATION
INTEGRAL TRANSFORMATIONS
MATHEMATICAL MODELS
PHASE VELOCITY
REFLECTION
REFRACTION
SHEAR
SONIC LOGGING
SOUND WAVES
TIME MEASUREMENT
TRANSFORMATIONS
VELOCITY
WAVE PROPAGATION
WELL LOGGING
WELL LOGGING EQUIPMENT