Transcript Use Of Tortuosity For Discriminating Electro-Facies To

Use Of Tortuosity For Discriminating Electro-Facies To Interpre
The
Electrical Parameters Of Carbonate Reservoir Rocks
Saner, S; AlHarthi, A; Htay, MT
ELSEVIER SCIENCE BV, JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING;
pp: 237-249; Vol: 16
King Fahd University of Petroleum & Minerals
http://www.kfupm.edu.sa
Summary
The electrical parameters of 80 various carbonate rock plugs from a Saudi Arabian
reservoir were measured. The results were first analyzed without considering the
Lithology, and then subsequently lithology was considered. Tortuosity distribution
and correlations with other petrophysical parameters were used in differentiating
samples of similar electrical properties, called ''electro-facies''. Tortuosity distribution
indicated two populations of data points one of which corresponded to the oolitic and
skeletal-intraclastic lithofacies, referred to as ''granular electro-facies''; and the other
to the muddy and the dolomitic lithofacies, named ''dolomitic-muddy electro-facies''.
Three methods were applied to interpret the cementation factor: (1) the Archie; (2) the
best fit; and (3) the cementation factor as a function of porosity. Error analysis
showed that the Archie cementation factor was not an appropriate method for the
studied reservoir rocks. The best fit and the cementation factor as a function of
porosity methods yielded more reasonable results and they are recommended over the
Archie method. A comparison of the water saturations obtained using the electrical
parameters of the overall samples with the water saturations obtained using the
parameters of each electro-facies showed significant errors especially in low water
saturation zones. This indicates the importance of litho- or electro-facies
discrimination in heterogeneous reservoirs.
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Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa
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©
Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa