Volumetric calculations of reflector curvature and seismic inversion of acoustic impedance were combined to infer distribution of lithofacies and fractures and to predict porosity. Also, laboratry measurements show excellent linear correlation between P-wave impedance and porosity. Laboratory core data show that Gassmann's fluid-substitution equation works well for microporous tripolitic chert. The relations among porosity, velocity, and impedance were explored and also reactions among production, impedance, and lineaments observed in 3D attribute volumes. In this case study the objective was to use cores, petrophysical logs, rock physics, and seismic attributes to characterize porosity and field-scale fractures. These reservoirs are characterized by microporosity they are heterogeneous and compartmented, which results in recovery of less than 30% of the oil in place. About the same amount of mobile petroleum remains in place. In west Texas, fractured-chert reservoirs of Devonian age have produced more than 700 million barrels of oil.
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