

Seismic techniques as applied to hazard surveys are essentially the same as those used for deep exploration, differing primarily in scale. Results suggest that the temporal bandwidth commonly specified for shallow profiling can probably be relaxed when areal data recording methods are applied Routine application would reasonably be expected to reduce drilling costs whilst significantly improving safety. The Short-Offset field technique that we propose for this work can be economically applied to hazard surveys. Commonly, these will remain unnoticed or be dismissed as noise in a vertical seismic profile. Even when 3-D methods have been applied, conventional seismic cross sections are inappropriate for displaying responses resulting from fractures or channels that have a small spatial footprint. In many cases small yet potentially important targets could remain unsampled by the customary grid of 2-D survey lines, or would be virtually uninterpretable without the benefit of 3-D migration. The pictorial quality of intensity-modulated time slice displays is particularly striking. Examples of such images are presented showing features of small physical dimensions, as well as a number of responses that are presumed to represent gas hazards. Job seekers interviewing for the role of a Seismic Interpreter may also reference it in preparation for the interview.Using results obtained from existing 3-D marine seismic surveys acquired with a compact recording geometry we show how true-amplitude migration processing can yield remarkably well-defined images of the shallow geology in plan view.
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