P070 DEPTH IMAGING AND VELOCITY ANALYSIS – CASE STUDY OF YAMBURG GAS FIELD Summary 1 The aim of this paper is to show the results of a prestack depth migration study and velocity analysis in the Yamburg gas field region. The dome-shaped Yamburg structure is an apparent inversion zone in which seismic reflectors corresponding to Cretaceous sediments lay discordantly on Jurassic-Triassic-Paleozoic sediments. Velocity analysis and PreSDM data confirm that the apparent inversion zone is caused by an isometric velocity anomaly which in its turn is caused by a gas chimney. Introduction The Yamburg supergiant gas field located in the northern


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