The Postle Field

Which seismic techniques have you used that proved effective when experiencing issues detecting a target reservoir?

At the Postle Field in Oklahoma, USA, traditional P-wave seismic was unable to delineate channelized sandbodies. This was associated with sub-seismic resolution, low acoustic impedance contrasts to surrounding shales and high sandstone compressibilities (Fig. 1a).

To counter these challenges, geoscientists utilized two techniques that were successful:

  1. 4-D seismic acquisition before and after CO2 WAG miscible flooding. This technique revealed subtle P-wave amplitude anomalies associated with moving CO2 fronts by increasing the impedance contrast of the sandstone reservoir to surrounding shales.
  2. Shear wave data. This technique made it possible to image fine-scale sandstone reservoirs in some areas and the detection of thinner sands (Fig. 1b).

The Digital Analogue Knowledge System (DAKS™) contains a library of global oil and gas analogues that include seismic imaging. Use these analogues to benchmark your own field, and delve into C&C Reservoirs Reservoir Evaluation Reports to discover best practices from top performing reservoirs that can be applied to your own assets.

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