Complex Depth Imaging using Reverse Time Migration for an Integrated High-Density Pointsource and Receiver Survey Onshore U.A.E. – A Case Study | SLB

Complex Depth Imaging using Reverse Time Migration for an Integrated High-Density Pointsource and Receiver Survey Onshore U.A.E. – A Case Study

Published: 09/23/2013

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Schlumberger Oilfield Services

We present the results of an integrated acquisition, processing and imaging survey in an area of complex near surface and thrust belt geology onshore Sharjah, UAE. High productivity point-source point-receiver data with full azimuth geometry was acquired. Steep dips and strong velocity heterogeneity cause complex wave propagation, and require advanced prestack depth migration (PSDM) to resolve. Key elements of the PSDM workflow are outlined, with an emphasis on those stages closely linked to the advantages of the full azimuth long offset acquisition geometry. The results of the final TTI Reverse Time Migration (RTM) depth images show the expected improvement over timedomain equivalents. Accurate velocity model building remains the key challenge, and requires a combination of data conditioning, careful interpretative input, and a velocity updating methodology that takes full advantage of the rich azimuth acquisition geometry.

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