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Determining wettability of an oil reservoir using borehole NMR measurements

  • US 6,765,380 B2
  • Filed: 08/02/2002
  • Issued: 07/20/2004
  • Est. Priority Date: 05/23/2002
  • Status: Active Grant
First Claim
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1. A method for determining downhole reservoir wettability, comprising:

  • acquiring a first set of nuclear magnetic resonance measurements of formation fluids in earth formations at a selected axial depth along a borehole;

    inverting the first set of the nuclear magnetic resonance measurements to produce a first distribution of a spin relaxation parameter for a fluid component in the formation fluids;

    acquiring a second set of nuclear magnetic resonance measurements of a formation fluid sample removed by a formation fluid testing tool at the selected axial depth, the formation fluid sample being kept at a substantially same pressure and a substantially same temperature as those of the formation fluids in the earth formations at the selected axial depth;

    inverting the second set of nuclear magnetic resonance measurements to produce a second distribution of the spin relaxation parameter for the fluid component in the formation fluid sample;

    determining the reservoir wettability from a comparison of the first distribution of the spin relaxation parameter and the second distribution of the spin relaxation parameter.

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