摘要：Wave-induced fluid flow is considered to be a major source of seismic attenuation and dispersion in porous rocks. From the physical description of partially saturated reservoirs, numerous analytical solutions based on upscaling homogenization theories have been employed to calculate equivalent frequency-dependent poroelastic media. Nevertheless, dispersion and attenuation predictions are often not reasonably consistent with laboratory and field measurements in a broad frequency range, particularly due to influences of biphasic fluids and their distribution, presence of heterogeneities on various length scales, and pore microstructure. We investigate the role of pore microstructure on pressure and fluid saturation dependence of elastic velocities in tight sandstones. Previous work points out that differentiating the impacts of heterogeneities at various scales on dispersion within seismic exploration and sonic frequencies can be very difficult. In practice, this is because fluid-related dispersion mechanisms are impossible to be independent. Thus, it is important for a theoretical and more quantitative analysis of the relative contribution of interrelated energy dissipation processes through a better understanding of combined influences due to the presence of microscopic and mesoscopic heterogeneities. Based on microscopic squirt flow and mesoscopic flow in a partially saturated medium, we develop a poroelastic model that allows evaluating the overall frequency-dependent dispersion via considering a random distribution of fluid heterogeneities as well as the broadly distributed aspect ratio of compliant pores. Experimental validation of the model is accomplished via a comprehensive comparison of predictions with measurements of partially saturated velocities versus pressure and fluid for sandstones with specific pore microstructures.

关键字：acoustics; attenuation; elastics; fluid flow; fluid saturation; pore microstructure; pressure dependence; rock physics; tight sandstone; velocity dispersion

ISSN号：0016-8025

卷、期、页：网络发表

影响因子：0.000000

期刊分区（SCI为中科院分区）：三区

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T2）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：GEOPHYSICAL PROSPECTING

参与作者：李红兵,戴晓峰,孙超,殷晗钧,张家良,施佩东,Zhang, Huiqing,Wei, Pengpeng

第一作者：贺艳晓,王尚旭,唐跟阳,袁三一

论文类型：期刊论文

论文概要：贺艳晓,王尚旭,李红兵,戴晓峰,唐跟阳,孙超,袁三一,殷晗钧,张家良,施佩东,Zhang, Huiqing,Wei, Pengpeng，Laboratory experiments and theoretical study of pressure and fluid influences on acoustic response in tight rocks with pore microstructure，GEOPHYSICAL PROSPECTING，，网络发表

论文题目：Laboratory experiments and theoretical study of pressure and fluid influences on acoustic response in tight rocks with pore microstructure