摘要：The variation of the seismic properties with frequency of a brine-saturated sandstone sample with a porosity of 22% was measured using a forced oscillation apparatus. Two pairs of orthogonal biaxial strain gauges were pasted at different locations at the length center of the sample. In the frequency range of 1-300 Hz, using these two pairs of strain gauges, we observed experimentally the same global flow but different local flows (squirt flow). Therefore, the observation of the local flow is influenced by the position of the strain gauges in contrast to the global flow. Indeed, local flow is strongly influenced by the microstructure (structure of the grain contacts and microcracks). In particular, we show that although the sample is homogeneous in terms of porosity and crack density, it is not the case in terms of crack aspect ratio, which may slightly vary along the sample. A 3D diffusion model coupled with a simple squirt model was built to further interpret the data. These results show that the wave-induced fluid flows occur at different scales and controls the dispersion and attenuation of saturated rocks.

关键字：attenuation; dispersion; dual‐ scale fluid‐ flow model; global flow and local flow; low‐ frequency measurement; seismic properties

ISSN号：2169-9313

卷、期、页：卷: 125期: 12

发表日期：2020-12-01

影响因子：3.638600

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,地学领域高质量科技期刊分级目录（国外T1）,SCIE（科学引文索引网络版）

发表期刊名称：JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH

参与作者：Fortin, Jerome,Borgomano, Jan V. M.

通讯作者：孙超

第一作者：唐跟阳,王尚旭

论文类型：期刊论文

论文概要：孙超,唐跟阳,Fortin, Jerome,Borgomano, Jan V. M.,王尚旭，Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements，JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH，2020，卷: 125期: 12

论文题目：Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements