P-wave velocity and attenuation (1/Q) data of water-saturated sand pack (from dry to full saturation) at 10 kilohertz frequency measured using an acoustic pulse tube under 10 MPa effective pressure

The data comprise P-wave velocity and attenuation (1/Q) measurements of water-saturated sand packs (four samples) across saturation levels, from dry to fully saturated. Using an acoustic pulse tube, measurements were recorded in the sonic frequency range (1-20 kHz, centred at 10 kHz) under 10 MPa effective pressure with atmospheric pore pressure. Data were collected in the Pulse Tube Laboratories at the National Oceanography Centre (NOC), Southampton, between March 2022 and January 2023, funded by the Natural Environment Research Council (NERC Grant NE/J020753/1), and primarily collected and analysed by Hanif Sutiyoso (University of Southampton). The experiment aimed to fill gaps in sonic frequency measurements of sediments across saturation states, providing a spectrum of water/gas saturation rather than a single value. This dataset is valuable for researchers analysing saturated sediments and is directly comparable to sonic well-logging field data due to its frequency range. The full dataset has been published at https://doi.org/10.1111/1365-2478.13607. The method involved measuring time series of signal amplitude from four samples (A to D) inside a 4.5 m water-filled acoustic pulse tube, which allows plane wave propagation in the sediment-jacketed samples. Time-domain data were transformed into the frequency domain using Fast Fourier Transform (FFT) and deconvolved with the chirp source signal to obtain the impulse response. Nonlinear inversion was used to minimize an objective function derived from initial time-domain estimates, determining the sample's complex velocity and attenuation (1/Q).

本数据集包含了从干燥状态至完全饱和状态的水饱和砂包的P波速度及衰减（1/Q）测量值，共涉及四个样本。利用声脉冲管，在声频范围内（1-20 kHz，中心频率为10 kHz）以及10 MPa的有效压力和大气孔隙压力下进行了测量。数据收集于国家海洋中心（NOC）南安普顿的脉冲管实验室，时间跨度为2022年3月至2023年1月，由自然环境研究委员会（NERC）资助（项目编号NE/J020753/1），主要由南安普顿大学的Hanif Sutiyoso进行收集和分析。实验旨在填补沉积物饱和状态下声频测量的空白，提供水/气体饱和度的光谱范围而非单一数值。该数据集对于研究饱和沉积物的研究人员而言具有重要价值，由于其频率范围，可直接与声波测井现场数据进行比较。完整的数据集已发表在https://doi.org/10.1111/1365-2478.13607。实验方法涉及对四个样本（A至D）内部4.5米水填充声脉冲管中的信号幅度时间序列进行测量，该装置允许在沉积物夹套样本中实现平面波传播。时域数据通过快速傅里叶变换（FFT）转换至频域，并与线性调频信号源进行反卷积，以获得冲激响应。非线性反演被用于最小化由初始时域估计推导出的目标函数，从而确定样本的复速度和衰减（1/Q）。