Long‐offset depth processing for sub‐basalt imaging in west of Bavla area Cambay Basin, Gujarat, India (original) (raw)
2009, SEG Technical Program Expanded Abstracts 2009
Throughout the world there are vast areas of the earth covered by basalt flow that are under-explored for hydrocarbons due to poor sub-basalt imaging. The very high reflectivity at the top of the basalt and high energy attenuation within the basalt cause the sub-basalt reflections to be very weak and completely masked by different orders of multiple generated above the basalt. In order to attempt to image below the basalt, seismic data with long maximum offset have been acquired. Sub-basalt reflections do become visible on long-offset data in the cone formed between the basalt top (Trap Top) refraction and the refraction from shallow layers as shown in Figure 1. Processing of long-offset data does have challenges associated with it such as mode conversion and anisotropy (both intrinsic as well as long-offset effect). In the present study a model-based noise attenuation technique has been applied to suppress the different kind of noises and VTI anisotropy has been modeled and accounted for in Kirchhoff Pre-Stack Depth Migration imaging. The results are very encouraging.
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