Diagram showing the generalized range of gamma-ray or SP log responses. It represents an "electrofacies" classification of curve shapes. These responses often are interpreted in terms of rock types and depositional environments. For example, the vertical rock sequence shown in the previous figure would be classed as a funnel-shaped, serrated to smooth shape, and could be representative of deposition of the rocks in a prodelta-to-delta environment. Source of figure is unknown.
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