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Title

THE ROLE OF SEPARATED POROSITIES ON DETERMINATION OF CEMENTATION FACTOR AND THE EFFECT OF NET CONFINING PRESSURE ON IT IN ONE OF IRANIAN HETEROGENEOUS CARBONATE RESERVOIRS

Pages

 Start Page 45 | End Page 52

Abstract

CEMENTATION FACTOR is the most important parameter in the fluids saturation models and small error in the evaluation of it has large effect on estimation of water saturation and therefore in-situ hydrocarbon reserve. Based on type of heterogeneity in HETEROGENEOUS carbonates the m value could be differed from 1 in fractured carbonates to 5 in separated vugs and molds porosity carbonate rocks. The increases of separated porosity in the rock will cause increase of m. Most of the time an experimental model for determination of m can be presented by accurate measurement of porosity and electrical resistivity of cores from drilling wells of a hydrocarbon field. Consider to different secondary digenesis conditions in hydrocarbon fields, the use of an experimental model from a field for another field will increase the risk of in-situ hydrocarbon reserve determination. In the present study to evaluate m for one of HETEROGENEOUS carbonate gas reservoir from south of 'Iran first porosity, permeability and PORE SIZE DISTRIBUTION of core samples from 3 drilled wells of this field were determined and by using this information and geological study of thin sections the reservoir rocks were grouped. Then to perform electrical resistivity measurements, the core plug samples were selected to cover the range of porosity in each rock type. Due to compressibility of reservoir rocks, which is occurred from increase in net overburden pressure after production and to investigate the effect of compressibility on CEMENTATION FACTOR, the electrical resistivity tests were performed in 4 different net confining pressure additions to ambient condition. The results showed that the m value is equal to 2.086 in ambient condition for dolostone with intercrystalline and interparticle porosity and will be increased to 2.148 in 4000 psi hydrostatic net confining stress. For other rock types, which were limestones with separated vug and mold porosity, an experimental model were presented for m that shows increase in m value with increase in porosity. In this type of limestones the effect of net confining stress on CEMENTATION FACTOR is more dominant than dolostones.

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