ABSTRACT

The Atlantis ocean bottom seismic (OBS) node project applied the technology of deep water node seismic acquisition in an effort to achieve high-quality subsalt imaging. As the first large-scale, deep water seismic acquisition survey to obtain data from autonomous nodes, the survey fostered innovations in node manufacturing, node deployment and survey design. Deployment equipment included a back deck designed to minimize human intervention, two remotely operated vehicles (ROVs), specially designed ROV skids and an advanced navigation system. Intensive modeling provided an assessment of optimal node spacing, node layout grid and source offsets. Further considerations of operational and investment costs, geophysical criteria, and processing requirements led to a final survey design of approximately 6 nodes/km2 in a hexagonal sampling pattern, divided into two patches. The Atlantis OBS node project successfully took a complex technology directly from inception to deep water application, bypassing the gradual progression from shallow to deep water implementation that has been standard for most deep water technologies.

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