Oil from Wyoming's Manderson Field is produced from a complex fracture system with possible significant lateral connectivity. It is therefore important to obtain as much information as possible about the nature of the fractures within the reservoir, especially between the wells.

This paper describes how amplitude variation with offset and azimuth (AVAZ) analysis of 3-D seismic data was used to determine fracture strike and density at (and around) wells in the field. The results show that this technique compares favorably with other methods of determining fracture strike and density and also provides important information about fracturing between wells.

Manderson Field,...

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