Nodes Provides a Reliable Repeatable and Cost Effective Solution for Reservoir Monitoring

Seabed data acquisition methods offer numerous advantages over towed streamer data. These advantages can lead to improved static and dynamic reservoir characterization. Full vector field data is recorded at the sea floor with improved shallow resolution, signal-to-noise ratio, broad band content and 3D illumination through full azimuth data acquisition. The last ten years the autonomous node technology has demonstrated its capability to improved imaging of complex reservoir structures with both pressure (PP) and in some cases converted shear (PS) data compared to previous OBC survey. The main reasons for these improvements are the stable and consistent measurements achieved by very well coupled nodes to the seabed as well as the full azimuth acquisition with densely sampled shots. Node cost sensitivity studies analyzing different 4C-4D node scenarios show clearly with respect to field size, water depth and node spacing that the node concept are getting radically more cost effective with increased field size and water depth.