Four sand pack samples provide P-wave velocity and attenuation (1/Q) measurements across a spectrum of water saturation states, from dry to fully saturated. Data were collected in a 4.5-meter acoustic pulse tube at the National Oceanography Centre between March 2022 and January 2023, under 10 MPa effective pressure. The experiment, funded by NERC and led by Hanif Sutiyoso, fills a gap in sonic frequency (1-20 kHz) measurements for sediment analysis.
Use Cases
- Model the relationship between P-wave velocity and water saturation state across four samples to calibrate rock physics models.
- Analyze attenuation (1/Q) trends from dry to full saturation to understand seismic energy loss in partially saturated sediments.
- Compare measured sonic frequency (10 kHz) P-wave data to field well-logging data for direct subsurface interpretation.
- Use the complex velocity data derived from nonlinear inversion to validate theoretical wave propagation models in saturated granular media.
Strengths
- Measurements cover a complete spectrum of saturation states, not just a single value, for four distinct samples.
- Data were collected under controlled laboratory conditions at 10 MPa effective pressure, simulating subsurface stress.
- Sonic frequency range (1-20 kHz, centered at 10 kHz) is directly comparable to field sonic well-logging tools.
Limitations
- Sample size is limited to four sand pack samples (A to D), restricting statistical generalization.
Provenance
- Source
- National Oceanography Centre (NOC), Southampton; British Geological Survey (BGS).
- Collection Method
- Acoustic pulse tube measurements with time-domain data transformed via FFT and deconvolution, using nonlinear inversion to determine complex velocity and attenuation.
- Time Range
- March 2022 to January 2023.
- Freshness
- Data collection concluded in January 2023.
- Geography
- Laboratory data from the United Kingdom; samples are not geographically specific.