High-resolution velocity estimation in sonic logging using full-waveform inversion
- Junichi Takekawa (Kyoto University) | Hitoshi Mikada (Kyoto University) | Kazuki Ishikura (Kyoto University, now at Mitsui Oil Exploration Co., Ltd.)
- Document ID
- Society of Exploration Geophysicists
- SEG International Exposition and Annual Meeting, 15-20 September, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Exploration Geophysicists
- Full-waveform inversion, Numerical, Borehole geophysics
- 2 in the last 30 days
- 2 since 2007
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Sonic logging has been widely used for many years to acquire physical properties of hydrocarbon reservoirs. Although sonic logging provides useful information in the subsurface, the resolution of existing methods is restricted to 6 inch defined by neighboring receiver distance of logging tool. However, there are significant needs to gain the resolution higher than the current detection of fluid contact locations as well as their variations in time. In the present study, we introduce full-waveform inversion (FWI) as an alternative technique to estimate P- and S-wave velocities with much higher resolution in sonic logging. Although FWI has been proven to provide seismic velocities with higher resolution than the other conventional seismic reflection methods, the applicability of FWI to sonic logging has not been fully investigated yet. We investigated the effectiveness of FWI using numerical experiments. Our results show that oil-water contact in the formation is visible with the resolution higher than the conventional sonic methods. We conclude that FWI could be applicable to sonic logging as a high-resolution method.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 1:50 PM
Location: Poster Station 4
Presentation Type: Poster
|File Size||1 MB||Number of Pages||5|
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