Towed Streamer EM

Making discoveries is becoming harder and fewer large fields are being found. Adding resistivity information to seismic can highlight prospective areas that may have been overlooked. PGS’ unique Towed Streamer EM technology enables large volumes of high-density 3D EM data to be acquired with far greater efficiency than before.

PGS can acquire 2D GeoStreamer® seismic simultaneously with high-density EM data from a single vessel, or high-density 3D 'EM only' data over existing or planned 3D seismic. The insight gained from the combined datasets has significant value and a range of applications; from cost-effective regional and near field exploration to reservoir level analysis of drilling hazards, hydrocarbon saturation and production optimization.

Structural interpretation is supplied from the seismic data and resistivity values from the Towed Streamer EM system. Both technologies seek to mitigate risk in the search for and extraction of oil and gas. High-density simultaneous acquisition and integrated data analysis and interpretation represent a step change in the application of EM technology.

Example of a seismically guided inversion from the Barents Sea, Towed Streamer EM and GeoStreamer data acquired simultaneously in 2013Example of a seismically guided inversion from the Barents Sea, Towed Streamer EM and GeoStreamer data acquired simultaneously in 2013

Key Benefits

Save time and capital 

  • Acquisition at same speed as towed streamer seismic (4-5 knots)
  • Unparalleled rate of data acquisition and data density
  • Simultaneous acquisition of EM and 2D GeoStreamer®
  • Can be deployed from virtually any seismic vessel, does not require an EM-dedicated crew
  • Real-time quality control and onboard processing of data

Increase exploration success 

  • Improved resolution and accuracy of inversions
  • Standard shot cycle of 120 seconds (250 m shot spacing)
  • Dense receiver spacing of 72 electrode pairs
  • Improved signal-to-noise ratio
  • Receivers towed through a homogeneous water layer are less sensitive to localized anomalies on the seabed

Integrate to extract maximum value

  • Seismically guided inversion improves resolution and characterization of deeper and more challenging structures
  • High data density and seismically guided inversion can enable more accurate imaging of highly resistive reservoirs including carbonates
  • Estimate hydrocarbon saturation and monitor over time (4D)
  • Estimation of hydrocarbon volume in place