Pulsed neutron logging mineralogy using oxide standards
AssigneeHalliburton Energy Services, Inc.
InventorsMayir Mamtimin, Jeffrey James Crawford, Weijun Guo
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Abstract
The techniques as described herein enhance the accuracy and precision of mineralogy analysis in elemental spectroscopy logging by utilizing oxide standards and/or rock-forming mineral compounds as reference materials that provide more representative and realistic signatures of geological formations. A method comprises logging a wellbore with a tool and fitting reference spectra from oxide compounds and/or rock-forming mineral compounds against measured gamma spectra obtained with the tool, to characterize a subterranean formation that the wellbore extends through.
Claims18
A method comprising:
- logging a wellbore with a tool;
- and
- fitting reference spectra from oxide compounds and/or rock-forming mineral compounds against measured gamma spectra obtained with the tool, to characterize a subterranean formation that the wellbore extends through, wherein the fitting comprises a weighted-least square fitting using spectra from elemental oxide standards.
A system comprising:
- a logging tool;
- and
- a computer configured to:
- fit reference spectra from oxide compounds and/or rock-forming mineral compounds against measured gamma spectra obtained from the logging tool, to characterize a subterranean formation, wherein the computer is configured to fit the reference spectra from the oxide compounds via a weighted-least-square fitting using spectra from elemental oxide standards.
Dependencies are inferred from the claim text.