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Detecting reservoir fractures and their orientation using multi azimuth walkaway VSPNormal access

Author: Grunde Rønholt
Event name: 9th International Congress of the Brazilian Geophysical Society
Session: VSP, Crosswell & Downhole Migration
Publication date: 11 September 2005
Organisations: SBGf
Language: English
Info: Extended abstract, PDF ( 184.32Kb )

Four walkaway VSP lines were acquired in the Kashagan East 1 well located in the Caspian Sea. Fracture orientations in the reservoir were obtained by acquiring data from multi azimuths and offsets recorded with several 3-component geophones lowered into the carbonate zone. Orientations were detected by interpreting the polarization of the fast and slow shear waves (figure 1) observed in the horizontal geophone component data.

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