Journal
GFF
Volume 139, Issue 4, Pages 276-288Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/11035897.2017.1397053
Keywords
Seismic survey; seismic velocity anomaly; tunnel valley; western Lithuania
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Buried tunnel valleys, developed by glacial meltwater below former continental ice-sheets, are often hardly recognisable during deep land seismic surveys and may act as obstructions in the investigation of deeper geological strata both onshore and offshore. Unique, detailed high-resolution onshore seismic investigations in western Lithuania revealed strong or marked anomalies of seismic velocities within the infilling of a tunnel valley. Such an anomaly produces a pull-up effect of seismic reflections from deeper geological interfaces, which in turn may produce inaccuracies in seismic data interpretation giving false pull-up structures, false faults and even false oil traps. In this paper, a method for improving depth mapping of horizons subject to high-velocity pull-ups in time-domain images is discussed. Using seismic and well-log data, improved geological sections were obtained by properly accounting for seismic velocities of valley-infill (lenses) obtained via well-logs.
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