The Use of Electromagnetic Mixing Rules for Petrophysical Evaluation of Dual- and Triple-Porosity Reservoirs
- Bukola K. Olusola (University of Calgary) | Guang Yu (University of Calgary) | Roberto Aguilera (University of Calgary)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- September 2013
- Document Type
- Journal Paper
- 378 - 389
- 2013. Society of Petroleum Engineers
- 5.6.1 Open hole/cased hole log analysis
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- 692 since 2007
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Electromagnetic mixing rules such as the Maxwell-Garnett rule, the Bruggemanequation, and the coherent-potential formula, are shown to be useful for theevaluation of the porosity exponent m in naturally fractured reservoirsrepresented by dual- and triple porosity models. Comparisons are made with coredata from limestone, dolomite, and tight gas reservoirs to corroborate resultsfrom the theoretical models. Rigorous values of m reduce the uncertaintyin the calculated values of water saturation and, thus, improve the estimatesof hydrocarbons in place and recoveries, particularly in situations in whichsufficient data are not available to use the material-balance approach. Themain advantage of the new method developed in this paper for petrophysicalanalysis is that it can handle, with the use of a single equation, theindividual mixing rules previously mentioned, and at the same time, dependingon the availability of data, it can quantify the values of matrix, fracture,and nonconnected-vug porosity, and the porosity exponent of the total porositysystem. It is concluded that electromagnetic mixing rules provide a usefulmethodology for the petrophysical evaluation of complex dual- andtriple-porosity reservoirs.
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