Well log data is always useful regardless of vintage or scaling.  Remember that the well log data is the only continuous depth record of the well bore. The significance being that the recorded depths on the well logs tied to the inferred reservoir characteristics based on the well log measurements provide an analyst with the best first start with respect to the analysis of a given well for hydrocarbon potential.

Don't discard older unscaled neutron and older unscaled gamma data or short normal and long normal resistivity data.  These can be digitized and re-scaled or normalized to behave with amazing consistency as compared to the more modern equivalent well logs. 

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