Combining Turning Ray and Reflection Tomography - the Whittle Case

M-36 COMBINING TURNING RAY AND REFLECTION TOMOGRAPHY – THE WHITTLE CASE Abstract 1 Over the last decade 3D pre stack depth migration has become the standard tool for imaging structures with rapid lateral velocity changes. The main challenge in getting a good seismic image is the construction of an accurate depth - interval velocity model. This paper presents a case where it was necessary to combine both turning ray tomography and the more commonly used reflection tomography to create the velocity model to migrate the data successfully. The Whittle structure in UKCS Block 42/28b is a complicated structure with strong