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Multipath imaging into common-reflection-angle volumes at a GOM site

ExxonMobil Upstream Research Company, Houston, USA

Corresponding author: graham.a.winbow{at}exxonmobil.com

This article summarizes a case history of imaging under a GOM salt mass. Our common-reflection-angle migration (CRAM) algorithm is a multipath ray-based imaging method that generates either common-offset or common-reflection-angle volumes. Results from common-reflection-angle volumes imaged with CRAM are compared with full-stack results for Kirchhoff (single path ray-based imaging) and wave-equation migration (WEM). The main conclusion is that, for shallow dip reflectors under steeply dipping salt, signal/noise is significantly improved by splitting the output data into common-reflection-angle volumes. This is efficiently accomplished using CRAM.