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- W1574114866 abstract "A pilot study of thirteen wells in the Means Oil Field of the Permian Basin, West Texas, has established porosity-permeability relationships for the Permian Queen, Grayburg, and San Andres Formations. The optimized workflow used borehole image and conventional log processing with calibration to core data. This approach has allowed the quantification of porosity and permeability heterogeneity in vuggy carbonate facies in the field. For example, in different vuggy zones of the San Andres Formation, with similar total porosity values of approximately 8%, permeability was found to vary by two to three orders of magnitude. This variation was modeled by an exponential relationship between permeability and the vuggy porosity partitioned from borehole image processing. A vuggy porosity index was estimated from conventional logs through a modified sonic porosity analysis. Permeability estimation used both the vuggy porosity partitioned from borehole image logs and the vuggy porosity index from conventional logs. It has allowed thief-zone identification for optimized well completion. In the San Andres Formation, vugs developed in thin zones have resulted in layer-cake structures of thin, superpermeable zones sandwiched between thicker, non-vuggy zones with bypassed oil. The average conventional-log porosity in these thin zones, where the layering is below log resolution, results in an erroneous permeability profile when input to the exponential relationship between vuggy porosity and permeability. Similarly, the thin-bedded Grayburg siliciclastic and dolomite facies rocks, which were generally thought to be poor reservoirs in this field, exhibit significant vertical variation in porosity and permeability. Petrophysical rock types have been differentiated using image and conventional log data and neural network processing. The integration of log-derived permeability and rock types with production data has provided the basis for interwell heterogeneity prediction and fieldwide completion strategies." @default.
- W1574114866 created "2016-06-24" @default.
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- W1574114866 date "2006-02-01" @default.
- W1574114866 modified "2023-09-23" @default.
- W1574114866 title "Porosity Partitioning and Permeability Quantification in Vuggy Carbonates Using Wireline Logs, Permian Basin, West Texas" @default.
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