A36 IMAGING THROUGH GAS USING 2D-3C DATA AND WELL LOGS - CASE STUDY FROM NORTH AFRICA Abstract 1 Shear waves can help imaging through gas-filled sediments. Many offshore examples have been published (Granli et al. 1999; McHugo et al. 1999) whereas onshore case histories are rare. In this project from North Africa onshore converted waves were processed to image complex gas-filled zones. The first phase of the project was performed without available well data. This paper focuses on the two main challenges of this processing project: the noise attenuation process and the improvement of migration models using well velocities. It


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