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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 75 (1991)

Issue: 7. (July)

First Page: 1145

Last Page: 1160

Title: Empirical Prediction of Previous HitPorosityNext Hit and Permeability in Sandstones (1)

Author(s): S. BLOCH (2)


Current efforts to predict Previous HitporosityNext Hit and permeability in sandstones prior to drilling are focused on empirical and process-oriented models. Empirical predictions are based on the correlation between Previous HitporosityNext Hit and permeability and a limited number of parameters obtained from calibration data sets or estimated from appropriate geologic models. Of these parameters, the most important are detrital composition, grain size, sorting, and temperature history or pressure history or both. Despite its limitations, the empirical approach provides accurate predrill predictions of Previous HitreservoirNext Hit quality in many sandstones containing not only primary but also secondary Previous HitporosityNext Hit and permeability. Predictions of the average Previous HitporosityNext Hit and permeability of target sandstones are arbitrarily defined h re as accurate if they fall within +/- 2% Previous HitporosityNext Hit of the mean measured Previous HitporosityNext Hit and within the same order of magnitude as the mean measured permeability in a sample population representing the interval of interest. The effectiveness of the empirical predictive approach is illustrated by case studies from the Taranaki basin (New Zealand) and Yacheng field (People's Republic of China). These studies indicate that empirical predictions are basin specific or even play specific, and require at least some understanding of fundamental processes affecting Previous HitreservoirNext Hit quality of a given Previous HitsandstoneNext Hit target.

Process-oriented approaches attempting to model the effect of diagenesis on Previous HitreservoirNext Hit quality are hampered by inadequate quantitative understanding of the processes responsible for preserving primary Previous HitporosityNext Hit and generating secondary Previous HitporosityNext Hit and permeability. Until adequate quantification of the Previous HitsandstoneNext Hit diagenesis processes is achieved, empirical models have a distinct advantage over process-oriented models in providing reliable predictions of Previous HitreservoirNext Hit quality in many Previous HitsandstoneTop intervals.

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