摘要：We conducted stress-strain oscillation experiments on dry and partially oil-saturated Fontainebleau sandstone samples over the 1-2000 Hz band at different confining pressures to investigate the wave-induced fluid flow (WIFF) at mesoscopic and microscopic scales and their interaction. Three tested rock samples have similar porosity between 6 and 7 per cent and were partially saturated to different degrees with different oils. The measurement results exhibit a single or two attenuation peaks that are affected by the saturation degree, oil viscosity and confining pressure. One peak, exhibited by all samples, shifts to lower frequencies with increasing pressure, and is mainly attributed to grain contact- or microcrack-related squirt flow based on modelling of its characteristics and comparison with other experiment results for sandstones. The other peak is present at smaller frequencies and shifts to higher frequencies as the confining pressure increases, showing an opposite pressure dependence. This contrast is interpreted as the result of fluid flow patterns at different scales. We developed a dual-scale fluid flow model by incorporating the squirt flow effect into the patchy saturation model, which accounts for the interaction of WIFFs at microscopic and mesoscopic scales. This model provides a reasonable interpretation of the measurement results. Our broad-frequency-band measurements give physical evidence of W1FF5 co-existing at two different scales, and combining with modelling results, it suggests that the WIFF mechanisms, related to pore microstructure and fluid distribution, interplay with each other and jointly control seismic attenuation and dispersion at reservoir conditions. These observations and modelling results are useful for quantitative seismic interpretation and reservoir characterization, specifically they have potential applications in time-lapse seismic analysis, fluid prediction and reservoir monitoring.

关键字：Elasticity and anelasticity; Fracture and flow; Acoustic properties; Seismic attenuation; Wave propagation

ISSN号：0956-540X

卷、期、页：卷: 224期: 3页: 1670-1683

发表日期：2021-03-01

影响因子：2.574000

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,地学领域高质量科技期刊分级目录（国外T2）,EI（工程索引）

发表期刊名称：Geophysical Journal International

通讯作者：赵立明

第一作者：唐跟阳,孙超,赵建国,王尚旭

论文类型：期刊论文

论文概要：赵立明,唐跟阳,孙超,赵建国,王尚旭，Dual attenuation peaks revealing mesoscopic and microscopic fluid flow in partially oil-saturated Fontainebleau sandstones，Geophysical Journal International，2021，卷: 224期: 3页: 1670-1683

论文题目：Dual attenuation peaks revealing mesoscopic and microscopic fluid flow in partially oil-saturated Fontainebleau sandstones