Determining wettability of an oil reservoir using borehole NMR measurements
First Claim
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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Abstract
A method for determining downhole reservoir wettability includes acquiring a first set of NMR measurements of formation fluids in earth formations at a selected axial depth; inverting the first set of the NMR measurements to produce a first distribution of a spin relaxation parameter for a fluid component in the formation fluids; acquiring a second set of NMR 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 temperature as those of the formation fluids in the earth formations at the selected axial depth; inverting the second set of NMR 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 and second distributions of the spin relaxation parameter.
78 Citations
14 Claims
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1. A method for determining downhole reservoir wettability, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification