GeoStreamer X combines multisensor broadband fidelity with rich azimuth illumination. The strategy can upgrade data in any geological regime.
- Cost-effective multi-azimuth data up to five times faster than node acquisition
- Advanced source configurations for optimal near and far offset coverage and reliable AVO analyses
- Long or extra-long offsets for reliable velocity model building
- Streamer spreads and source configurations
- can be tailored for any spatial sampling requirements
- Broadband imaging resolution from the near-surface to the deepest targets
- Lower environmental footprint and reduced risk of area conflicts with fisheries
Meeting Subsurface Imaging and Characterization Challenges
The GeoStreamer X configuration can be applied to new surveys in new areas or to overshoot existing GeoStreamer data for a rapid upgrade. Acquisition design can include wide-tow sources, dense streamers for improved near-offset distribution, and long streamers for accurate velocity model building.
GeoStreamer X can be tailored for geological challenges at any depth. The figure below schematically illustrates how the flexible towing and handling capacity of Ramform vessels creates many survey design possibilities to improve both offset and azimuth sampling with the efficiency benefits of GeoStreamer surveys.
Schematic illustration of the GeoStreamer X concept.
The images below represent a compelling demonstration of enhanced shallow imaging resolution possible without compromising survey efficiency.
A shallow time slice at 200 ms (bottom left) and a cross-section (top left) for legacy data that used standard triple-source separation of 75 m for a 12x75 m streamer configuration. The corresponding time slice and cross-section (right) for GeoStreamer X with a wide-tow source separation of 350 m and a 14x75 m configuration reveals enhanced image resolution and clarity at all depths.
The final figure below is an example where GeoStreamer X data enabled existing fields and known discoveries in the southern Viking Graben to be accurately mapped and new leads and opportunities suitable for near-field exploration have been highlighted. With an improved understanding and characterization of the various reservoir intervals, evidence of additional nearby hydrocarbon potential has been revealed. Several additional wells have been drilled, following the Lille Prinsen discovery, to examine the potential in the deeper stratigraphic intervals such as the Jurassic sandstone and the Permian. In the image below, based on our elastic-attributes extraction on the pre-Cretaceous interval, clear indications of hydrocarbons are visible at the Upper Jurassic and Zechstein levels. These anomalies are of reasonable size and could constitute interesting nearfield exploration targets.
Ultra-far relative impedance map extraction is highly correlated to Vp/Vs at the top Cretaceous over a 16ms window. Blue anomalies match well with the Norwegian Petroleum Directorate (NPD) outline for the Lille Prinsen discovery at this level. A visible anomaly further north-west was tested successfully by a recent appraisal well. Additional opportunities exist to the south of Lille Prinsen, as well as down-flank.
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