Tuning Rings Deep in the DHI Window
- The DHI character of this 'anomaly' is really weak except for the destructive intersection tuning ring
- There is weak evidence of a constructive adjacent tuning ring from the amplitude map which can also be seen on the seismic profile. Here it also conforms to constructive tuning at the potential contact immediately below. There is also locally a potential flatspot that conforms to this tuning but this is also very weak.
- The soft top intra-reservoir event on the seismic profile shows a narrowing of the reflector or localised hardening that conforms to the potential flatspot. In a strong DHI case the intra-reservoir soft event would be softer updip than downdip of the potential contact but this does not appear to be the case here
- These characteristics as DHIs are hardly compelling though an amplitude extraction from the intra-reservoir event (top left) reveals a sharp destructive intersection tuning ring that closely follows the intra-reservoir contour contortions. The only indicator or this tuning ring on the seismic is the narrowing of the intra-reservoir reflector. This tuning ring is a compelling DHI indicator, particularly as it conforms to the other much weaker indicators
- Faults can have a similar appearance as the destructive intersection tuning ring but tend to be more linear whereas the tuning ring will follow the contour contortions