摘要：We present results of laboratory measurements of velocity dispersion in dry and water partially saturated tight gas sandstones at seismic frequencies (2-100Hz) with strain amplitudes lower than <10-6. We also obtained the elastic properties at the ultrasonic frequency range (∼1MHz) using the ultrasonic transmission method. There is no significant dispersion of compressional wave velocity (Vp) observed in the measured dry tight gas sandstone with low porosity (4.6%) and low permeability (0.073mD) from seismic to ultrasonic frequencies. By increasing saturation in the experiment, we found that the measured dispersion of Vp is 5.5% from seismic to ultrasonic frequencies when the saturation is 20%. However, the difference of Vp between dry condition and partial saturation (20%) is 9% at seismic frequencies. We used Berryman's DEM model and Gassmann-Wood's equation to predict the velocities of tight gas sandstones with porous-fractured structures obtained by Micro-CT scan images. The theoretical predictions and our low-frequency results are in good agreement. These direct laboratory measurements on partially saturated tight gas sandstone at both seismic and ultrasound frequencies are relatively few are done, which are of great interest to tight sandstone gas reservoir characterization in low frequency.

卷、期、页：p1936-1940

发表日期：2015-01-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）,国际学术会议论文集

发表期刊名称：77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment

参与作者：魏晛

通讯作者：殷晗钧

第一作者：王尚旭,赵建国,唐跟阳

论文类型：会议论文

论文概要：魏晛,王尚旭,赵建国,唐跟阳,殷晗钧，Direct measurements of wave dispersion at seismic frequencies and Gassmann fluid substitution，77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment，2015，p1936-1940

论文题目：Direct measurements of wave dispersion at seismic frequencies and Gassmann fluid substitution