Abstract：Physical model experiment reveals that fluid saturation the characteristic of fluid in pores，seismic wave frequency and the ratio of vertical size to lateral size of a pore all cause great influence on seismic wave attenuation. With the aid of a research on heating activation of viscoelastic relaxation，we analyse how seismic wave attenuates in fluid-saturated sandstone. Having analysed some relaxation characteristics of feldspathic sandstone plates which were saturated respectively by water，crude oil and oil-water mixture，we found that the main reason why relaxation peak exists is the phase boundary relaxation at interface between fluid and pore within feldspathic sandstone. Fluid-saturated porous rock can be described by using generalized Voigt three-parameter model and Cole-Cole distribution. The relaxation peak usually widens because there exists stack phenomenon of multiple relaxations in fluid-saturated porous rock. Experiment led to the conclusion:the relaxation peak of oil-water saturated sandstone is wide，the distribution width of crude-saturated sandstone is little bigger than that of pump-oil saturated sandstone，and the relaxation peak of water-saturated sandstone is narrow.
席道瑛, 程经毅, 席军. 饱和砂岩滞弹性弛豫热激活过程机理探讨[J]. 石油地球物理勘探, 1998, 33(3): 348-354.
Xi Daoying, Cheng Jingyi, Xi Jun . Research on the heating activation mechanism of viscoelastic relaxation in fluid-saturated sandstone. OGP, 1998, 33(3): 348-354.
