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The Pinedale Anticline in Wyoming, USA, has become an area of significant interest since the recent success of several gas wells completed in its tight sandstone reservoirs. Production from these reservoirs is now possible using new stimulation techniques that were developed in neighboring Jonah field. The best production rates appear to come from reservoirs enhanced by natural fractures. Therefore, a new technique that detects open natural fractures in the reservoir could help the success of future wells.
This new technique, AVAZ, uses azimuthal variations in the amplitudes of seismic data, at long shot/receiver offsets, to identify fractures. A modification of this technique has been used on a portion of Veritas’ multi-client 3D survey over the Pinedale anticline to identify the presence of these fractures in the interwell region. Results of this analysis were compared to what is already known about fractures in the reservoirs of the Pinedale anticline.
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