Methods for evaluating formations using NMR and other logs

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science

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702 8, G06F 1900

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active

060321016

ABSTRACT:
Methods that allow in-situ calculations of critical petrophysical parameters including, but not limited to, .phi..sub.t, S.sub.xot, Q.sub.v, F, and R.sub.w are provided. Also, NMR clay bound water may be used to estimate a continuous Q.sub.v. In combination with other resistivity logs, such as SP, R.sub.xo and R.sub.deep, R.sub.w can be determined. With the exception of the saturation exponent n, all Archie parameters and other computational equivalents are continuously determined directly from well logs. The methods therefore allow S.sub.w to be determined more accurately, which leads to improved estimation of hydrocarbon reserves. The method is extended to complex lithology with additional tools. In complex lithology, permeability estimation is also improved using a method that estimates bound fluid volume. Also, an uncertainty analysis of the gas-corrected parameters is also provided.

REFERENCES:
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C. Clavier, G. Coates and J. Dumanoir, "The Theoretical and Experimental Bases for the `Dual Water `Model for the Interpretation of Shaly Sands," 6859 Society of Petroleum Engineers Transactions, pp. v5 -v20 (1977).
R. Freedman, A. Boyd, G. Gubelin, D. McKeon, C.E. Morriss, and C. Flaum "Measurement of Total NMR Porosity Adds New Value to NMR Logging," Paper O, Transactions of the Soc. of Prof. Well Log Analysts 38.sup.th Annual Logging Symposium (1997).
R. Akkurt, H.J. Vinegar, P.N. Tutunjian and A.J. Guillory, "NMR Logging of Natural Gas Reservoirs," Paper N, Transactions of the Society of Professional Well Log Analysts 36.sup.th Annual Logging Symposium (1995).
M.G. Prammer, E.D. Drack, J.C. Bouton and J.S. Gardner, "Measurements of Clay-Bound Water and Total Porosity by Magnetic Resonance Logging," SPE paper 35622, presented at Society of Petroleum Engineers Annual Technical Conference and Exhibition (1996).
C. Flaum, R.L. Kleinberg and M.D. Hurlimann, "Identification of Gas with the Combinable Magnetic Resonance Tool, " Transactions of the Society of Professional Well Log Analysts 37.sup.th Annual Logging Symposium (1996).

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