A technique is developed for distinguishing between gas and water-filled fractures using P-wave data. The method relies upon combining the azimuthal AVO signature for a fractured reservoir with its interval moveout time. A cross-plot of these attributes provides a robust and simple indicator, irrespective of the offset and azimuth distribution at the bin location. The technique is applicable to reservoirs whose production is assisted by the presence of natural fractures, where saturation maps can help to better quantify and assess pathways for flow.
Figures & Tables
Anisotropy 2000: Fractures, Converted Waves, and Case Studies
“This volume contains 25 papers that represent most of the best work in seismic anisotropy in 1998 and 1999. Fracture characterizations and processing of converted waves are the two main topics covered in this volume. They are addressed from both theoretical and practical viewpoints. Also included are papers describing the historical roots of seismic anisotropy.”