A rock physics analysis project was conducted to better understand the flat spot seismic response observed in the Vøring basin, Norwegian Sea, Norway. Flat spots could be considered as the best direct hydrocarbon indicator (DHI), however understanding their existent characteristics on the wells and circumstances under which they have a recognizable expression on the seismic data, could help to reduce risk for the exploration efforts currently being undertaken in this area. This study included a complete rock physics analysis and detailed prestack forward modeling to understand the effect of fluid, porosity and seismic resolution variations on fluid contact seismic reflections. From the modeling we generated a complete catalog of the expected fluid contact responses for various scenarios. To fully understand the specific characteristics of flat spots in this area, more than looking for standard responses such as flatness, associate “bright spot”, positive amplitude and tuning effects at the ends of the contact, we need to model fluid thickness, rock properties and seismic vertical resolution. This is mandatory for DHI prospect evaluation in the studied area.


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