초록

Methods and apparatus for obtaining a mass spectrum of a sample and determining a concentration of a component of the sample by utilizing a model of chemical and electron ionization and the obtained mass spectrum.

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1. A method, comprising: conveying a downhole tool in a borehole penetrating a subterranean formation;obtaining, using the downhole tool while the downhole tool is positioned downhole, a mass spectrum of a sample subject to a combined chemical and electron ionization process; anddetermining a concen

1. A method, comprising: conveying a downhole tool in a borehole penetrating a subterranean formation;obtaining, using the downhole tool while the downhole tool is positioned downhole, a mass spectrum of a sample subject to a combined chemical and electron ionization process; anddetermining a concentration of a component of the sample by utilizing a chemical and electron ionization model and the obtained mass spectrum. 2. The method of claim 1 wherein the sample is obtained downhole from a formation fluid sampled from the subterranean formation. 3. The method of clam 1 wherein the sample is obtained downhole from a drilling fluid sampled from within a drill string proximate the downhole tool. 4. The method of claim 1 wherein the sample is obtained downhole from a drilling fluid sampled from an annulus formed between a wall of the borehole and a drill string proximate the downhole tool. 5. The method of claim 1 wherein determining the concentration of the component is performed using the downhole tool while the downhole tool is positioned down hole. 6. The method of claim 1 wherein determining the concentration of the component comprises determining a proportion of the component relative to another component of the sample. 7. The method of claim 1 wherein the chemical and electron ionization model is linear in pressure. 8. The method of claim 1 wherein the chemical and electron ionization model is calibrated for primary and binary interactions of the component. 9. The method of claim 1 wherein the component comprises at least one hydrocarbon specie. 10. The method of claim 1 wherein the component comprises hydrogen sulfide. 11. The method of claim 1 wherein the component comprises carbon dioxide. 12. The method of claim 1 wherein the component comprises nitrogen. 13. The method of claim 1 wherein the component comprises hydrogen. 14. The method of claim 1 wherein the component comprises helium. 15. The method of claim 1 wherein the determining the concentration of the component comprises using an inversion model. 16. The method of claim 1 wherein determining the concentration of the component comprises determining a relative concentration of a plurality of components of the sample. 17. The method of claim 1 wherein the mass spectrum comprises peaks and the intensities of the peaks are used in the chemical and electron ionization model. 18. The method of claim 17 wherein a selected number of peaks are used in the chemical and electron ionization model. 19. The method of claim 1 wherein determining the concentration of the component is performed without separation of a plurality of components of the sample. 20. The method of claim 1 wherein at least one component of the sample is a chemical reagent.