Applications of wideband em measurements for determining reservoir formation properties
AssigneeSchlumberger Technology Corporation
InventorsNikita Seleznev, Tarek Habashy, Austin Boyd
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Abstract
A method for determining reservoir formation properties that consists of exciting the reservoir formation with an electromagnetic exciting field, measuring an electromagnetic signal produced by the electromagnetic exciting field in the reservoir formation, extracting from the measured electromagnetic signal a spectral complex resistivity as a function of frequency, fitting the spectral complex resistivity with an induced polarization model and deducing the reservoir formation properties from the fitting with the induced polarization model.
Claims16
1) A method for determining a reservoir formation properties comprising:
- i) exciting the reservoir formation with an electromagnetic exciting field;
- ii) measuring an electromagnetic signal produced by the electromagnetic exciting field in the reservoir formation;
- iii) extracting from the measured electromagnetic signal a spectral complex resistivity as a function of frequency;
- iv) fitting the spectral complex resistivity with an induced polarization model;
- and
- v) deducing the reservoir formation properties from the fitting with the induced polarization model.
11) A computer-implemented method for determining a reservoir formation properties, said method comprising:
- i) acquiring in a computer software program an electromagnetic signal received from a electromagnetic tool;
- ii) extracting from the measured electromagnetic signal a spectral complex resistivity as a function of frequency;
- iii) fitting the spectral complex resistivity with an induced polarization model;
- and
- iv) deducing the reservoir formation properties from the fitting with the induced polarization model.
12) A method for determining the wettability of a reservoir formation comprising the steps of:
- i) exciting the reservoir formation with an electromagnetic exciting field;
- ii) measuring an electromagnetic signal produced by the electromagnetic exciting field in the reservoir formation;
- iii) extracting from the measured electromagnetic signal a spectral complex resistivity as a function of frequency;
- iv) extracting the imaginary part from the spectral complex resistivity;
- v) deducing the wettability of the reservoir formation from said extracted imaginary part.
Dependencies are inferred from the claim text.