摘要：Compared to the high porosity and high permeability sandstones with relatively simple pore geometry, the rock skeleton and pore structure of tight sandstones often exhibit heterogeneity at different scales. The velocity of the rock is partly controlled by mineral composition, porosity and fluid type; however, pore microstructure may be more important than other factors, especially for tight sandstones. In this study, we measured the P-wave and S-wave velocities of 3 tight sandstones saturated with water, oil and glycerin under varying confining pressures, using the ultrasonic transmission technique. We focused on the effects of pore structure on the elastic parameters of these tight sandstones. We first used two different methods to calculate the pore aspect ratio spectrum, modeled the velocity data under different saturation conditions with the Gassmann fluid substitution theory, the K-T model and the squirt flow model. The Gassmann fluid substitution theory fails to explain the velocity changes. We find that the K-T model and the squirt flow model considering the pore structure can better explain the velocity variation of the fluid-saturated tight sandstones, but the fitting of the K-T model is better than that of the squirt flow model.
© 2019 SEG

卷、期、页：p3588-3592

发表日期：2020-01-01

收录情况：EI（工程索引）,国际学术会议论文集

发表期刊名称：SEG International Exposition and Annual Meeting 2019

通讯作者：Han, Xu

第一作者：唐跟阳,贺艳晓,董春晖,杨立敏,王尚旭

论文类型：会议论文

论文概要：Han, Xu,唐跟阳,贺艳晓,董春晖,杨立敏,王尚旭，Effect of pore aspect ratio spectrum on ultrasonic velocities of tight sandstones saturated with different fluids，SEG International Exposition and Annual Meeting 2019，2020，p3588-3592

论文题目：Effect of pore aspect ratio spectrum on ultrasonic velocities of tight sandstones saturated with different fluids