Laboratory study of fluid viscosity induced ultrasonic velocity   dispersion in reservoir sandstones

doi:10.1007/s11770-010-0235-3

CORC > 北京大学 > 地球与空间科学学院

	Laboratory study of fluid viscosity induced ultrasonic velocity dispersion in reservoir sandstones
	He Tao ; Zou Chang-Chun ; Pei Fa-Gen ; Ren Ke-Ying ; Kong Fan-Da ; Shi Ge
刊名	applied geophysics
	2010
关键词	ultrasonic velocity dispersion fluid viscosity reservoir sandstones in-situ conditions SQUIRT-FLOW WAVE ATTENUATION FREQUENCY RANGE SATURATED ROCKS ELASTIC-WAVES SHEAR MODULUS POROUS ROCKS MODEL CLAY ANISOTROPY
DOI	10.1007/s11770-010-0235-3
英文摘要	Ultrasonic velocities of a set of saturated sandstone samples were measured at simulated in-situ pressures in the laboratory. The samples were obtained from the W formation of the WXS Depression and covered low to nearly high porosity and permeability ranges. The brine and four different density oils were used as pore fluids, which provided a good chance to investigate fluid viscosity-induced velocity dispersion. The analysis of experimental observations of velocity dispersion indicates that (I) the Biot model can explain most of the small discrepancy (about 2 - 3%) between ultrasonic measurements and zero frequency Gassmann predictions for high porosity and permeability samples saturated by all the fluids used in this experiment and is also valid for medium porosity and permeability samples saturated with low viscosity fluids (less than approximately 3 mP center dot S) and (2) the squirt flow mechanism dominates the low to medium porosity and permeability samples when fluid viscosity increases and produces large velocity dispersions as high as about 8%. The microfracture aspect ratios were also estimated for the reservoir sandstones and applied to calculate the characteristic frequency of the squirt flow model, above which the Gassmann' s assumptions are violated and the measured high frequency velocities cannot be directly used for Gassmann's fluid replacement at the exploration seismic frequency band for W formation sandstones.; Geochemistry & Geophysics; SCI(E); 4; ARTICLE; 2; 114-126; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155852]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	He Tao,Zou Chang-Chun,Pei Fa-Gen,et al. Laboratory study of fluid viscosity induced ultrasonic velocity dispersion in reservoir sandstones[J]. applied geophysics,2010.
APA	He Tao,Zou Chang-Chun,Pei Fa-Gen,Ren Ke-Ying,Kong Fan-Da,&Shi Ge.(2010).Laboratory study of fluid viscosity induced ultrasonic velocity dispersion in reservoir sandstones.applied geophysics.
MLA	He Tao,et al."Laboratory study of fluid viscosity induced ultrasonic velocity dispersion in reservoir sandstones".applied geophysics (2010).