3-D seismic data: proportional slices and volume visualization
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Interpreting 3-D seismic data |
| Author | Geoffrey A. Dorn |
| Link | Web page |
| Store | AAPG Store |
Additional refinement to the horizon-slice approach can be made to accommodate situations where there is growth, or differential deposition, in an interval between two interpreted horizons. For such an interval, the reflections between the two interval-bounding horizons are not parallel to either bounding horizon. To some extent, the shape of the reflections in this interval is intermediate between the shapes of the interval bounding horizons. A set of slices between the two bounding horizons, which more closely mimics the shape of the reflections in that interval, is given by
where:
- S = the intermediate surface
- H1 = the shallower horizon
- H2 = the deeper horizon
- R = a fraction that varies between 0 and 1
Definition
The new surface, S, is the shallower horizon time structure plus a fraction of the isochron between the two bounding horizons. Such a slice is called a proportional slice because it is proportionally between the two bounding horizons. In certain environments that exhibit significant growth in the interval, the proportional slice can provide a significantly improved image of the depositional stratigraphy compared to horizon slices in the shape of either bounding horizon.
Creating proportional slices
Horizon slices and proportional slices have been available for a number of years in interactive interpretation systems. Some of the implementations are awkward; creating the proportional slice, in particular, may be a multistep process. Ideally, creating these slices should be a fully interactive process, allowing the interpreter to explore intervals of interest in the 3-D seismic volume for indications of paleodepositional systems.
3-D volume visualization of depositional systems
Advances in pattern recognition and volume seeding have provided tools that allow the interpreter to seed and pick the depositional system as a 3-D body. This allows the interpreter to see the depositional system as a 3-D object within the seismic volume. Visualizing this object in three dimensions provides visual integration of the stratigraphy of the depositional system with the overprint of current structural relief.
See also
External links
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