NMR Measurements in Carbonate Rocks: Problems and an Approach to a Solution |
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| Authors: | Email author" target="_blank">Hildegard?WestphalEmail author Iris?Surholt Christian?Kiesl Holger F ?Thern Thomas?Kruspe |
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| Institution: | (1) Geologisches Institut, Universität Hannover, Callinstr. 30, 30167 Hannover, Germany;(2) Present address: Institut für Paläontologie, Universität Erlangen-Nürnberg, Loewenichstraße 28, 91054 Erlangen, Germany;(3) Present address: Baker Hughes INTEQ, Christensenstr. 1, 29221 Celle, Germany;(4) Baker Hughes INTEQ, Christensenstr. 1, 29221 Celle, Germany |
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| Abstract: | Carbonate rocks are well known for their complex petrophysical behavior where, in contrast to siliciclastic rocks, different parameters, including porosity and permeability, usually are not directly related. This behavior is the result of thorough reorganization of porosity during diagenesis, and it turns prediction of reservoir quality of carbonate rocks into a challenge. The study presented here deals with the problem of utilizing NMR techniques in prediction of petrophysical properties in carbonates.We employ a visual porosity classification as a priori knowledge for better interpreting NMR data for prediction purposes. This allows for choice of suitable T2 cutoff values to differentiate movable from bound fluids adapted for the specific carbonate rock, thus resulting in better interpretation of NMR data. The approach of using a genetic pore type classification for adapting the conventional method for T2 cutoff determination, which originally was developed for siliciclastic rocks, is promising. Similarly, for permeability determination on the basis of NMR measurements, the classification of carbonate rocks based on porosity types also shows potential. The approach implemented here has the promise to provide a basis of standardized interpretation of NMR data from carbonate rocks.Acknowledgment We are grateful to Baker Hughes INTEQ, Celle, for permission to publish the results of this work. This study was part of I.S. s Masters Thesis at Hannover University that was carried out in collaboration with Baker Hughes INTEQ, Celle, Germany. We appreciate comments of an anonymous referee and PAGEOPH editor Brian J. Mitchell. |
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| Keywords: | NMR carbonates porosity permeability prediction diagenesis |
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