摘要：Reflection coefficient is a significant parameter in seismic exploration and closely related to seismic velocity contrast between different layers. In this paper, the reflection coefficient dispersion at the interface of a cap and a reservoir (saturated with different fluid) is studied. The ultrasonic pulse reflection method is used to measure the waveform of a tight sandstone (acting as a cap layer). Besides, we also recorded the waveforms of an extra conventional sandstone (to simulate reservoir) placed under the cap and saturated with different fluids (gas, water and oil #2/oil #68). With the waveforms of reflections at top and bottom interfaces of the cap both with and without reservoir placed underneath it, a simple ratio is derived and calculated to estimate the dispersion of reflection coefficient. We find the reflection coefficient has no dispersion or weak dispersion when the reservoir is dry; nonetheless, dispersion appears when the sandstone is water and oil-saturated. It is likely that the difference of frequency dependence between dry and water/oil saturation is caused by pore-fluid flow. Furthermore, the whole procedure in this paper for reflection coefficient ratio calculation can detect its dispersion under different conditions (change of pore fluid or reservoir properties) with a uniform standard.
© 2019 SEG

卷、期、页：p3623-3627

发表日期：2020-01-01

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：SEG International Exposition and Annual Meeting 2019

通讯作者：李敏,赵立明,韩旭

第一作者：唐跟阳,董春晖,孙超,王尚旭

论文类型：会议论文

论文概要：李敏,唐跟阳,董春晖,赵立明,孙超,韩旭,王尚旭，The measurement of reflection coefficient dispersion in the ultrasonic frequency range，SEG International Exposition and Annual Meeting 2019，2020，p3623-3627

论文题目：The measurement of reflection coefficient dispersion in the ultrasonic frequency range