Abstract

The purpose of this study is to develop new models capable of providing better description of the reservoir through the use of the concept of Reservoir Quality Index (RQI) combined with the available permeability models appearing in the literature.

Six enhanced reservoir characterization models have been developed that incorporate core and/or conventional well-logging derived-data to identify hydraulic (flow) units. Two models are developed based on equation of Nuclear Magnetic Resonance (NMR) to identify flow units using core data. In addition, three flow unit models are developed based on Timur, Wyllie and Rose, and a generalized permeability equations. The sixth model is developed using Jorgensen permeability equation. It is found that each flow unit can be represented by a straight line on a log-log plot of the RQI versus porosity,, or versus the parameter()depending upon the permeability equation used.

The straight line (representing the flow unit) yields various unique slopes for the different models. This depends upon the porosity exponent that appeared in the permeability equation. In addition, each flow unit model possesses a characteristic intercept on the NMR Decay time- # log-log plot, or on the RQI- # log-log plot, or on RQI() log- log plot. The new flow unit models are validated by using actual and simulated data. Use of the new models in combination with the systematic technique developed,

2. Is correlative and mappable at the interwell scale; represents effctive tools for enhancing reservoir characterization.

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