Abstract

A seismic velocity model is one of the products generated from a seismic imaging project. Recent advances in velocity modeling techniques have significantly improved the quality of seismic velocity data. Yet, the use of seismic velocity to guide geologic interpretations is still limited. This is mainly due to the overwhelming effect of compaction and the low-resolution nature of the seismic velocity model. Geologic boundaries and anomalies are often difficult to visualize from seismic velocity data alone. A new attribute called the trend-match attribute is proposed to reveal changes in velocity compaction trends from seismic velocity. The attribute is computed by comparing seismic velocity data with the regional velocity depth trends defined for different lithofacies using wells. We applied the trend-match attribute on several case studies to facilitate stratigraphic interpretation, horizon mapping, and erosion thickness estimation. Integration of the trend-match attribute volume with migrated seismic images can further constrain the geologic and stratigraphic interpretation at a regional scale.

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