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Abstract A new, direct method for the extraction of the fundamental rock properties expressed by Lamé''s parameters, Lamé''s constant (?) and shear rigidity (?), from pre-stack seismic data is proposed. It will be shown that this new method is more stable and less ambiguous than the method currently used to extract these parameters from seismic data.
- South America > Argentina (0.29)
- North America (0.29)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (0.89)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (0.86)
- Geophysics > Seismic Surveying > Seismic Interpretation > Seismic Reservoir Characterization > Amplitude vs Offset (AVO) (0.70)
ABSTRACT Fractures are small cracks that occur when brittle rock is stressed to the point where it breaks. Zones of high stress frequently occur where the rock is bent the most, and therefore in places where seismic migration is most likely to be needed. Consequently, it is often important to be able to integrate seismic fracture analysis with migration. Conventional pre- and post-stack migration methods are incapable of handling azimuthal variations in amplitude. However, they can be modified to do this, and then they can be used in positioning seismic fracture attributes. Some such time-migration methods are tested on a geologically complex data set over the Manderson Field in Wyoming, USA, for which well control for the fractures in the reservoir is available. All these migrations collapse zones of apparently high fracture intensity and move them closer to significant structural features, e.g. faults.
- Geology > Geological Subdiscipline > Geomechanics (0.49)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (0.31)
- North America > United States > Wyoming > Manderson Field (0.99)
- North America > United States > Wyoming > Bighorn Basin > Phosphoria Formation (0.99)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Faults and fracture characterization (0.94)
Summary The Pinedale Anticline in Wyoming, USA, has become an area of significant interest since the recent success of several wells that have produced significant volumes of gas from 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 that have had their permeability enhanced by natural fractures. Therefore, the ability to detect the presence of natural fractures in the reservoir could have a significant positive impact on the success of future wells. A new technique uses azimuthal variations in the amplitudes of seismic data at long shot-receiver offsets to identify the presence of open natural fractures.
- Geology > Geological Subdiscipline (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.91)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (0.81)
- North America > United States > Wyoming > Sand Wash Basin (0.99)
- North America > United States > Wyoming > Manderson Field (0.99)
- North America > United States > Wyoming > Green River Basin > Pinedale Field (0.99)
- (12 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)