Ultrasonic-to-seismic measurements of shale anisotropy in the North sea well
- and others
An extensive data set was collected in a North sea well for the purposes of characterizing the anisotropic elastic properties of the shales. The data set included extensive VSP (Verticle Seismic Profile) surveys, a full logging suite including DSI (Dipole Shear Sonic Imager), and whole core analysis. A walkway VSP survey collected using Schlumberger`s ASI (Array Seismic Imager) tool, was used to estimate the anisotropic elastic properties of the North Sea shale. DSI waveforms were analyzed for depth continuous compressional and shear wave velocities. The core was analyzed for anisotropic elastic properties at in situ overburden and pore pressures. The measurements were taken at ultrasonic frequencies using transducers with a bandwidth approximately from 100 to 900 kHz. Comparisons were made of the P and S wave velocities determined at ultrasonic frequencies in the lab with the sonic frequency DSI measurements and seismic frequency P and S wave velocities estimated from the rig source VSP. Finally, traveltimes acquired with the walkway VSP survey were inverted for the TI elastic parameters of the North Sea shale and compared with the laboratory estimations.
- OSTI ID:
- 542816
- Report Number(s):
- CONF-951013--
- Country of Publication:
- United States
- Language:
- English
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