Description

VSP (Vertical Seismic Profile) is the main link between time-based surface seismic imaging and depth/based well logs. It provides a high-resolution image of the structure in the vicinity of the instrumented well. One or several seismic sources on the surface are fired and recorded by the downhole receivers (GEOREC) positioned at different depth levels. The downhole receivers allow recording in lower noise conditions as well as recording direct arrivals and recording higher frequencies (->higher resolution) than the equivalent surface tools. GEOREC is a downhole digital receiver designed for seismic acquisition in HP & HT conditions. Each GEOREC single level includes 3 fixed or gimballed geophones. Pressure and temperature gauges, are optionally provided. Each downhole GEOREC level is provided with its own power supply and telemetry. Up to 48 GEOREC levels can be successively connected with a 7 conductors standard cable.