--> Abstract: Relationship Between Pore Geometry and Pore-Throat Geometry as a Means to Predict Reservoir Performance in Secondary Recovery Programs for Carbonate Reservoirs, by Christina M. Dicus; #90078 (2008)
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Relationship Between Previous HitPoreNext Hit Geometry and Previous HitPoreNext Hit-Previous HitThroatNext Hit Geometry as a Means to Predict Reservoir Performance in Secondary Recovery Programs for Carbonate Reservoirs

Christina M. Dicus
Petrophysical Analysis Subsurface Technology, ConocoPhillips, Houston, TX

The purpose of this study was to develop a method by which a detailed porosity classification system could be used to understand the relationship between Previous HitporeNext Hit/Previous HitporeNext Hit-Previous HitthroatNext Hit geometry, genetic porosity type, and facies. This study also investigated the relationships between Previous HitporeNext Hit/Previous HitporeNext Hit-Previous HitthroatNext Hit geometry, petrophysical parameters, and reservoir performance characteristics. The focus was on the Jurassic Smackover reservoir rocks of Grayson field, Arkansas. This three part study developed an adapted genetic carbonate Previous HitporeNext Hit type classification system, and used petrographic image analysis and mercury-injection capillary pressure tests to calculate Previous HitporeNext Hit/Previous HitporeNext Hit-Previous HitthroatNext Hit Previous HitsizesNext Hit. These were compared to facies, Previous HitporeNext Hit type, and each other showing that Previous HitporeNext Hit-Previous HitthroatNext Hit size is controlled by Previous HitporeNext Hit type and that Previous HitporeNext Hit size is controlled primarily by facies. Previous HitPoreNext Hit size range can be estimated from Previous HitporeNext Hit type and median Previous HitporeNext Hit-Previous HitthroatNext Hit aperture. Capillary pressure data was used to understand the behavior of the dependent rock properties. It was determined that size-reduced samples tend to show similar dependent rock property behavior, but size-enhanced samples show dispersion. Capillary pressure data was used to understand fluid flow behavior of Previous HitporeNext Hit types and facies. Oncolitic grainstone samples show unpredictable fluid flow behavior compared to oolitic grainstone samples, yet oncolitic grainstone samples will move a higher percentage of fluid. Size-enhanced samples showed heterogeneous fluid flow behavior while the size-reduced samples could be grouped by the number of modes of Previous HitporeNext Hit-Previous HitthroatNext Hit Previous HitsizesNext Hit. Finally, this study used petrographic image analysis to determine if 2-D porosity values could be compared to porosity values from 3-D porosity techniques. The heterogeneous Previous HitporeTop network found in the Grayson reservoir rocks prevents the use of petrographic image analysis as a porosity calculation technique.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas