Joint Imaging Of 3D Fiber Optic Das Vsp And Obn To Solve Shallow Gas Cloud Problem In Bokor Field Malaysia
M.F. Abdul Rahim, A.R. Ghazali and M.D. Davis
Event name: EAGE Conference on Reservoir Geoscience 2018
Session: Session 10: VSP and DAS
Publication date: 03 December 2018
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In this paper we implement a Joint Imaging of the 3D fiber optic DAS VSP and OBN to improve imaging below gas cloud to enable better reservoir characterization. This survey simultaneously acquired 3D seabed nodal seismic and 3D Distributed Acoustic Sensing (DAS) Vertical Seismic Profiles (VSP) using fiber optic in three adjacent deviated offshore production wells. Production was not suspended during the VSP acquisition, so the resulting data was contaminated with production “noise” which varies with depth and over time. From the joint imaging results, better delineation of faults and reflector continuity can be seen in areas previously effected by the shallow gas cloud. The VSP data has a higher bandwidth at reservoir level compared to the OBN dataset. This could be attributed to the undershooting below the gas cloud and proximity of the VSP receivers to the reservoir.