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Effect Of Structure On Wide Azimuth Acquisition And Processing
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 11th International Congress of the Brazilian Geophysical Society, Aug 2009, cp-195-00144
Abstract
This model study shows that narrow azimuth acquisition may be adequate for structures which are oriented dip to the acquisition direction but strike components are not well imaged. Wide azimuth acquisition with sufficient cross line offset gives improved results compared to narrow azimuth acquisition for both dip and strike components since this method is actually “directionless”. Also, 3D SRME on narrow azimuth data shot dip gives a good image but narrow azimuth strike data does not yield a comparable uplift from 3D SRME. The application of 3D SRME to wide azimuth data shot either dip or strike yields a very good image which is superior to any of the results without 3D SRME. Results from the datasets with the multiples suppressed shows that dip components are well imaged with narrow azimuth acquisition but strike components may not be. Even if one suppresses all the multiples, wide azimuth is needed to image the strike components of the structure. Ray trace illumination maps can be used to determine the shadow zones in the model and help determine the width and direction of wide azimuth acquisition required to minimize these shadow zones. Finally, a real data comparison of NAZ versus WAZ acquisition and processing shows that the observations seen in the model data are also confirmed in the real data.