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Correlations Between NMR-Relaxation Response and Relative Permeability From Tomographic Reservoir-Rock Images
- Tariq M. AlGhamdi (Saudi Aramco) | Christoph H. Arns (University of New South Wales) | Ramsin Y. Eyvazzadeh (Saudi Aramco)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2013
- Document Type
- Journal Paper
- 369 - 377
- 2013. Society of Petroleum Engineers
- 5.1 Reservoir Characterisation
- 7 in the last 30 days
- 591 since 2007
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Nuclear magnetic resonance (NMR) is typically used in the petroleum industryto characterize pore size and to identify fluids in fully and partiallysaturated reservoir samples. Although the NMR-relaxation response can be usedto estimate the permeability of the rock, it may also provide information aboutthe fluid distribution for multiphase systems that could lead to the estimationof the effective permeability of fluids at partial saturations and thederivation of relative permeability to assess hydrocarbon recovery. By use of arandom-walk method, we simulate the NMR response as a function of saturation ontomographic images of Bentheimer and Berea sandstone as well as Ferroandolomite samples. Fluid distributions are simulated for fully water-wetconditions by use of a morphological capillary-drainage transform, allowing thecalculations of the saturations directly on the images corresponding tocapillary pressure. The magnetic susceptibility of minerals and fluids is usedto calculate the internal magnetic fields from the material distributions ofsolids and fluids quantified by X-ray-diffraction (XRD) analysis. We show thatthe logarithmic mean of the NMR T2 distribution is a robustmeasure of permeability, and it results in strong correlations between NMRresponse and the relative permeability of both fluids. The observed relativepermeability from NMR in our work is in excellent agreement with image-basedrelative permeability calculations by use of the lattice Boltzmann method(LBM). We compare our NMR results for the wetting phase to publishedexperimental results on Bentheimer and Berea sandstone samples, and we observeexcellent agreement. By use of NMR numerical calculations, we demonstrate thatinternal gradients aid the establishment of relative permeability correlationsfor the nonwetting phase.
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