The quality of seismic reflection results has a direct relation to newer petroleum provinces in the North American continent. An approach is suggested whereby a seismic study of changes of physical characteristics of subsurface reflecting horizons and/or reservoir beds can be attempted. The changes in the quality of deeper reflecting horizons in relation to a persistent shallow or 'control' horizon may be able to add a fourth dimension to present seismic interpretations. It is possible that every record may become important from the viewpoint of evaluating petroleum possibilities and not merely those records 'on structure.'

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