Jun 7th-DP & Acquisition SIG: Velocity Analysis and Update with 3D DAS-VSP to Improve Borehole/Surface Seismic Images*
Sponsored by Schlumberger
Event Location:
Schlumberger
Q Auditorium
10001 Richmond Avenue
Houston TX 77042 USA
NOTE: You Must Be Logged In to Register
Speaker: Dr. Yingping Li, Borehole Geophysics Lead, Shell E&P
Shell conducted its first dual-well 3D DAS-VSP survey concurrently with an OBS survey in a deep water environment in the Gulf of Mexico in 2012. This survey produced about 40M picks of the first arrival times (FAT) which were used to diagnose and update velocity models for improvement of both borehole and surface seismic images of subsurface structures. We developed a procedure to use the VSP-FAT to diagnose the velocity models derived from surface seismic surveys and monitor the velocity updating process. The method first was used for selecting a suitable initial velocity model. After the travel-time tomography inversion of FAT, this diagnosis approach was applied again to the updated VTI-inversion model to ensure the velocity updating effort is on the right track. We used the Absolute and Relative Misfits (AM & RM) and apparent velocities to quantify the velocity model uncertainties as functions of depth, azimuth, and offset. Both DAS-VSP data at two wells and OBS data were migrated with the initial VTI velocity model and the updated VTI-inversion model. It is found that both borehole and surface seismic images generated with the VTI-inversion model are improved from those obtained with the VTI-initial model, especially for the seismic amplitudes at a target event.
Speaker: Dr. Yingping Li, Borehole Geophysics Lead, Shell E&P
Dr. Yingping Li has worked for Shell Exploration and Production Company since 2005. He is a Senior Staff Geophysicist and Borehole Geophysics Lead, in charge of Shell Marine VSP programs in North and South America. He is also Shell global SME (Subject Matter Expert) for VSP Design and Operation. From 1997-2005, he worked as a geophysicist and then a geosciences advisor at Baker Hughes on various VSP projects around world. He was a post-doctor and then a research scientist at MIT from 1992-1997, working on micro-seismic and earthquake seismology. He obtained his PhD (1992) in Geophysics at New York Stony Brook University, USA. He received an M. S. (1984) in Seismology from Institute of Geophysics, Beijing, China, and B.S. (1982) in Geophysics at University of Science and Technology, China. He is member of AGU, EAGE, and SEG.
Time Schedule:
4:30 PM – sign-in, social time
5:00 PM – start of presentation
6:00 PM - close of meeting
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