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Reservoir quality investigation by combination of core measured data and NMR technique analysis: a case study of Asmari carbonate reservoir in Gachsaran field

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Abstract

The main purpose of comprehensive reservoir characterization is to reliably calculate, characterize and identify petrophysical parameters including porosity, permeability, rock fabrics, pore size distribution, pore network system, saturation and capillary pressure. These essential petrophysical properties could be achieved by a combination of Nuclear Magnetic Resonance (NMR), conventional and special core analysis (CCAL/SCAL) in core laboratories. In this study, six core plug samples from the Asmari carbonate Formation in Gachsaran oilfield have been examined by the core measurements and NMR technique to evaluate and compare the petrophysical properties. Initially, the plug samples are prepared by core plugging, trimming, solvent cleaning and oven drying methods. Comparison between well Gamma ray log and core gamma ray adjust the depth to the real position of reservoir target. Basic SCAL measurements are then conducted on the prepared plugs in steps to calculate porosity, permeability, capillary pressure and fluid movements. Then the dry samples are completely saturated with brine and the basic properties are re-measured by the NMR method. The relationship between rock quality values (porosity and permeability) determined from NMR technique and core results demonstrate that by applying some adjustments on NMR modeled values, the precise results are achievable. Pore size distribution curves displayed in this paper confirm the NMR modeled pore throat curves and shows NMR could be applied as useful technique for estimating pore size distribution when they are in agreement with Mercury Injection Capillary Pressure (MICP) pore size distribution. The NMR pseudo capillary pressure curves show consistency with capillary pressure and saturation behavior of MICP tests. In addition, the lithology, rock fabric and pore shapes are checked by petrographic images of thin sections as representative of microscopic reservoir characteristics in the reservoir. In present study, applying of NMR technique to the plugs and comparison the obtained results with SCAL results demonstrate how the NMR technique can objectively and quantitatively provide petrophysical analysis for a carbonate reservoir and combination of core analysis and NMR technique could optimize reservoir quality investigation.

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Acknowledgements

This study is a part of the coauthor’s dissertation at Amirkabir University of Technology, Tehran. The first and corresponding author would like to thank NIOC for their support and data.

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Authors and Affiliations

  1. Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran

    Mehdi Shabani, Saeed Yarmohammadi & Sima Ghaffary

  2. Stratum Reservoir, Abu Dhabi, UAE

    Mehdi Shabani

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  1. Mehdi Shabani
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  2. Saeed Yarmohammadi
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  3. Sima Ghaffary
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Correspondence to Mehdi Shabani.

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Shabani, M., Yarmohammadi, S. & Ghaffary, S. Reservoir quality investigation by combination of core measured data and NMR technique analysis: a case study of Asmari carbonate reservoir in Gachsaran field. Carbonates Evaporites 38, 1 (2023). https://doi.org/10.1007/s13146-022-00824-y

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