Reservoir Monitoring of SAGD using Repeated Dual-Well 3D VSP Measurements. A Case Study after 10 months of Production

Two 3D VSP surveys have been acquired over Statoil and PTTEP's Leismer Demonstration Area in the Canadian Athabasca Oil Sands region, aiming at monitoring parts of the reservoir during steam assisted gravity drainage. Within the framework of a Statoil-Schlumberger cross-well collaboration project, careful survey planning, accurate acquisition setup and thorough time-lapse processing have provided seismic data with clearly visible production-induced differences, after only 10 months of production.