SPE Annual Technical Conference and Exhibition 2000
DOI: 10.2118/63257-ms
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Combining NMR and Conventional Logs to Determine Fluid Volumes and Oil Viscosity in Heavy-Oil Reservoirs

Abstract: The presence of viscous oil in a reservoir greatly complicates the interpretation of NMR log data. Because the NMR signal from an oil with a viscosity greater than 1,000 cp in the sub-surface typically decays with a T2 time-constant that is comparable to that of capillary-bound or clay-bound water, it is impossible to distinguish the signal from the oil phase from that of the bound-water phases. Various petrophysical quantities, such as permeability and fluid volumes, that are normally derived relatively direc… Show more

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Cited by 15 publications
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“…The detailed steps of the TIST algorithm are shown below: (1) Input the regularization parameter λ and the iterative steps α and β and set the maximum number of iterations iter max and the convergence tolerance tol. 2 Ks t+1 − y 2 2 + λ s t+1 1 ; the negative elements in s t+1 are zeroed; if L(s t+1 ) > L(s t ), we re-compute s t+1 = Ψ λ s t + K T (y − Ks t ) and L(s t+1 ) = 1 2 Ks t+1 − y 2 2 + λ s t+1 1 . Subsequently, the accuracy ξ t+1 = L(s t+1 ) − L(s t ) /L(s t ) and let the iteration number t = t + 1.…”
Section: Conclusion and Prospectsmentioning
confidence: 99%
See 1 more Smart Citation
“…The detailed steps of the TIST algorithm are shown below: (1) Input the regularization parameter λ and the iterative steps α and β and set the maximum number of iterations iter max and the convergence tolerance tol. 2 Ks t+1 − y 2 2 + λ s t+1 1 ; the negative elements in s t+1 are zeroed; if L(s t+1 ) > L(s t ), we re-compute s t+1 = Ψ λ s t + K T (y − Ks t ) and L(s t+1 ) = 1 2 Ks t+1 − y 2 2 + λ s t+1 1 . Subsequently, the accuracy ξ t+1 = L(s t+1 ) − L(s t ) /L(s t ) and let the iteration number t = t + 1.…”
Section: Conclusion and Prospectsmentioning
confidence: 99%
“…Heavy oil is characterized by a high viscosity of more than 100 cp and low American Petroleum Institute (API) gravity in the range of 10-20 • . Worldwide heavy oil reserves are about 6 trillion barrels [1][2][3][4]. Due to the decrease in conventional oil and gas production, an increasing number of researchers have focused on the exploration and development of heavy oil reservoirs.…”
Section: Introductionmentioning
confidence: 99%