First Published: First Break, November 2025, by Eric Mueller, Martin Widmaier and Julien Oukili (TGS).
Introduction
Multi-azimuth (MAZ) multi-sensor towed streamer seismic data are an efficient and competitive means to providing significantly improved imaging of South Viking Graben (SVG) margin flanks
and graben centres. Flexible survey design and acquisition efficiency combined with modern processing and velocity model-building workflows create a step up in data quality to image potential new plays in the otherwise mature North Sea rift system.
An example of heavily faulted interval with mud diapirs of various sizes and low velocity infills. The left images show velocity and stack overlays. Some imprint of the main azimuth of the NAZ data is visible in the ‘1 Azimuth’ simulation, where only the largest velocity anomalies are recovered, but even so with limited dynamic range.
Data quality and MAZ illumination allow imaging of Upper Jurassic lateral successions of fault scarp graben edges, details of terrace floor gravity flow deposits, terrace incisions and basin floor fans extending out on the graben centre at current burial depths greater than 4000 m.
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