The Garden Banks well described below was drilled to test a seismic amplitude anomaly at 6.1 s two-way time (23 000 ft subsea). The original well found pay and was sidetracked twice for field size delineation. The first sidetrack drilled downdip and established an oil/water contact. The second sidetrack drilled updip to test an adjacent fault block. These three penetrations provide hard data with which to analyze the imaging errors of two prestack time migrations and one prestack depth migration of the prospect area with respect to fault placement and oil/water contact location.

Both prestack time migrations have “high amplitudes”...

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