摘要：We developed a system to explore the effects of pressure and fluid viscosity on the dispersion and attenuation of fully saturated tight sandstones, especially at seismic frequencies. Calibration of the new system revealed that the system can operate reliably at frequencies of [2-200, 10(6)]Hz. Tight sandstone with a crack-pore microstructure was tested under nitrogen gas (dry), brine, and glycerin saturation. A frequency-dependent effect was not found for the dry case. However, apparent dispersion and attenuation for the undrained/unrelaxed transition was clearly observed for sample under brine or glycerin saturation, the magnitude of which was largely suppressed by increasing effective pressure. The measurement results illustrated that increasing the fluid viscosity or the effective pressure will shift the dispersion curve to the lower frequency range. A simple squirt-flow model with dual-porosity scheme was used to compare with the measurement results. Although the estimated values deviated slightly from the data, the trend fitted the saturated data relatively well, especially at low effective pressures. Therefore, considering the crack-pore microstructure of the tight sandstone, dispersion and attenuation are induced predominantly by the squirt-flow stiffening effect from cracks to pores.

关键字：low-frequency experiments seismic dispersion and attenuation tight sandstone

ISSN号：2169-9313

卷、期、页：卷: 122 期: 11 页: 8925-8942

发表日期：2017-11-01

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）,ESI（基本科学指标数据库）,SCIE（科学引文索引网络版）

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

通讯作者：殷晗钧,赵立明,马宵一

第一作者：赵建国,唐跟阳,王尚旭

论文类型：期刊论文

论文概要：殷晗钧,赵建国,唐跟阳,赵立明,马宵一,王尚旭，Pressure and Fluid Effect on Frequency-Dependent Elastic Moduli in Fully Saturated Tight Sandstone，JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH，2017，卷: 122 期: 11 页: 8925-8942

论文题目：Pressure and Fluid Effect on Frequency-Dependent Elastic Moduli in Fully Saturated Tight Sandstone