Wide- and multi-azimuth acquisition: Issues and answers

Three things have become increasingly clear in recent years regarding seismic acquisition. One is that increased data density, whether through sources or sensors, is good. The second is that, especially under complex overburden, some aspects of structure and rock properties appear different depending on shooting direction, and this is not predictable. Thus, wider and more varied azimuths are desirable. The third is that these two things are even better when combined and are not independent of advanced processing schemes, such as wave equation migration and surface-related multiple attenuation. And of course, oil companies want it all fast and at a lower cost. GARDEN BANKS EXAMPLE A clear demonstration of imaging targets under complex overburden with different shooting directions was presented by Bruce ver West in 2001.1 In 2000, Veritas acquired 3D seismic data over a substantial area of 16 offshore blocks in the Garden Banks area of the Gulf of Mexico...

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