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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The classical formula for volumetric estimates involving factors for area, sand thickness, porosity, saturation, and recovery is reviewed and the need for modification and amplification of the factors demonstrated. Individual factors are redefined in their new content and methods for their evaluation outlined. Necessity for consideration of both physical and economic effects in the choice of a recovery factor is emphasized. Recovery factors for oils are distinguished from those for gases for co-occurring and produced oil and gas mixtures. Applicability of volumetric reserve estimates to engineering appraisal is discussed and inherent limitations of the procedure set forth.
In conclusion the writers point out that practical accuracy in volumetric estimates of oil and gas reserves is dependent both on the accuracy and completeness of the data available and on the skill and resourcefulness of the engineer or geologist in analyzing and visualizing reservoir conditions and fitting together the fragmentary data into a compatible whole. Similarities with and differences from other fields within his experience should be recognized as well as the practical limitations of the factors involved, their relative importance and relative weight.
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