Abstract
Laboratory measurements are described on Permian coals from Wollongong, New South Wales, Australia, related to the dependence of ultrasonic P- and S-wave velocities, attenuation, anisotropy and the dynamic elastic moduli on confining pressure, water saturation, and pore pressure. Five independent stiffness constants are used to represent the elastic anisotropy of the specimens as a function of confining pressure and water saturation. The anisotropy is believed to be controlled mainly by the internal structure of the coals, while the pressure dependence of the constants is controlled mainly by randomly oriented cracks. The results show that dynamic elastic properties are potential indicators of the states of stress and saturation in coal seams, and provide necessary information for computer modeling and interpreting seismic surveys carried out to assist mine development. -from Authors
| Original language | English |
|---|---|
| Pages (from-to) | 30-38 |
| Number of pages | 9 |
| Journal | Geophysics |
| Volume | 58 |
| Issue number | 1 |
| Publication status | Published - 1993 |
Keywords
- WAVE ATTENUATION
- BEREA SANDSTONE
- VELOCITY
- ROCKS
- ANISOTROPY
- DISPERSION
- DRY