This study presents simple graphical methods (0 predict itt-situ formation compressibility from production data. The graphical methods are based on the conventional material balance equation for oil reservoirs. The material balance equation is recasted into several straightline formats such that either the intercept or the slope of the straightline yields an estimate of formation compressibility. Also, floe information from the straightline plots can be used to predict oil-in-place.

The new predictive methods were applied to field data from a depletion/compaction drive reservoir. The formation compressibility and oil-in-place values predicted by the proposed methods were compared with those from other sources and methods, resulting in excellent agreement.

The proposed graphical techniques are limited to depletion/compaction drive reservoirs and cannot be applied to reservoirs subject to strong water-drive.

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