Use of F-overlays to evaluate air-drilled Devonian shale wells simplifies recognition of subtle variations in log response between productive and nonproductive intervals. Combinations of F-curve overlays, called F-pairs, are plotted on a logarithmic grid and normalized in an interval thought to be unfractured. Anomalous response behavior becomes useful in choosing fractured intervals.

Keywords:
interpretation, hydrocarbon, formation factor, unconventional gas recovery symposium, log analysis, crossplot porosity, shale, induction log, upstream oil & gas, porosity
Subjects:
Hydraulic Fracturing, Reservoir Characterization, Formation Evaluation & Management, Unconventional and Complex Reservoirs, Open hole/cased hole log analysis, Shale gas
Copyright 1984, Society of Petroleum Engineers of AIME
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