QUANTIFICATION AND INTERPRETATION OF MULTIPLE GENERATIONS OF QUARTZ CEMENTS: IMPROVING RESERVOIR QUALITY PREDICTIONS IN CLASTIC RESERVOIRS
We present a case study where multiple generations of quartz cements have been quantified, and their impact on reservoir quality modeling has been tested. Quartz cement was quantified in quartz arenite samples from Research Wells A and B using both traditional petrographic and SEM-CL point counting methods. Color SEM-CL revealed at least three distinct quartz cement events (inhereted from previous depositional cycle, localized pore-filling cement, and burial quartz overgrowth).
Several reservoir quality simulations were performed in TouchstoneTMto assess the impact of accurate quartz cement quantification on predictions. When only traditional petrographic point count was used, assuming all point counted quartz cement was associated with burial diagenesis, poor model calibration of porosity, permeability, and quartz cement resulted. Significant improvement of model calibration was obtained only by using quantification from color SEM-CL identified generations of quartz cement (inherited, pore filling, and burial diagenesis). This improvement leads to more robust prediction of reservoir quality away from well control.
 Cooper et al. (2000) Spec. Publs int. As. Sediment 29, 89-101.