USE OF ADVANCED DATA PROCESSING TECHNIQUES IN THE IMAGING OF THE COSO GEOTHERMAL FIELD
Conference Proceedings: USE OF ADVANCED DATA PROCESSING TECHNIQUES IN THE IMAGING OF THE COSO GEOTHERMAL FIELD
AbstractDuring December of 1999, approximately 32 miles of seismic data were acquired within the Coso Geothermal Field, Inyo County, California, as part of a detailed seismic investigation undertaken by the US Navy Geothermal Program Office. Data acquisition was designed to make effective use of advanced data processing methods, which include Optim's proprietary nonlinear velocity optimization technique and pre-stack Kirchhoff migration. The nonlinear optimization technique is used to obtain high resolution velocity models. These models are then used in a pre-stack Kirchhoff depth migration to focus the coherent reflections contained in the reflection data and image subsurface structures. Velocity models from the Coso field reveal lateral velocity variations across known faults and discontinuities in the volcanic terrain. Models along east-west seismic lines appear to show that the geothermal producing area has relatively lower velocities (down to depths of 4000 feet) compared to the surrounding area. Pre-stack depth migrations using these velocity models image several coherent reflections in the upper 25,000 feet of the crust. These include a strong reflector at about 20,000 feet, truncations against the Coso Wash fault, and reflectivity within the geothermal producing region. We combine the velocity models from the 2-D lines to construct a 2.5D velocity model of the Coso geothermal field. Analyses of the 2.5D volume allows us to tie together velocity signatures seen along individual 2D lines, and look for features that are characteristic of the geothermal producing region.
- Pullammanappallil, S.; Honjas and W.
- PROCEEDINGS, Twenty-Sixth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 29-31, 2001, 1/1/2001
- Not Provided
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Pullammanappallil, S.; Honjas, W.. 1/1/2001. USE OF ADVANCED DATA PROCESSING TECHNIQUES IN THE IMAGING OF THE COSO GEOTHERMAL FIELD. Proceedings of (!) ; (!) : PROCEEDINGS, Twenty-Sixth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 29-31, 2001.