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Reflection Seismic Imaging Using Smart DAS Upholes
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
We invent and test a new system to acquire seismic data using continuous fiber-optic DAS cable deployed in a grid of shallow vertical holes. This system allows simultaneous land near-surface characterization and subsurface imaging in a cost-efficient manner. With smart DAS upholes we achieve perfect calibration of near-surface complexities and record cleaner seismic data. Connecting multiple upholes with a single fiber enables efficient acquisition of seismic surveys with buried vertical arrays, which can provide images of the deeper subsurface similar to surface seismic, but with improved structural control, since they bypass most of the near-surface complexities. We have performed successful 2D field testing of such a system on one of the onshore fields in Saudi Arabia. The new system can deliver an on-demand standalone survey that simultaneously characterizes the near surface, performs deep reflection imaging of oil and gas targets for exploration, and can be used for development or reservoir monitoring. Such a system is long overdue for land regions that have complex near-surface conditions.