NOVELTY - Determining a property for a hydrocarbonaceous sample comprising a component prepared from: the thermo-catalytic conversion of biomass, or the pyrolytic conversion of biomass with subsequent upgrading, involves: measuring a model property for each of several model hydrocarbonaceous materials comprising varying amounts of the component; acquiring several model absorbances over near-infrared spectrum for each of the model hydrocarbonaceous materials; correlating the model properties with model absorbances to establish correlation; acquiring, and comparing steps.    USE - For determining a property for a hydrocarbonaceous sample (claimed); in producing bio-oils.    ADVANTAGE - The method determines is an improved and efficient method for determining properties of either: bio-oil produced from a thermo-catalytic or pyrolytic conversion of biomass or fuel blended from a conventional fuel and a fraction of such bio-oil.    DETAILED DESCRIPTION - Determining a property for a hydrocarbonaceous sample comprising a component prepared from: the thermo-catalytic conversion of biomass, or the pyrolytic conversion of biomass with subsequent upgrading, involves: measuring a model property for each of several model hydrocarbonaceous materials comprising varying amounts of the component; acquiring several model absorbances over a near-infrared spectrum for each of the model hydrocarbonaceous materials; correlating the model properties with several model absorbances to establish a correlation; acquiring several sample absorbances over the near-infrared spectrum for the hydrocarbonaceous sample; and comparing the several sample absorbances to the several model absorbances using the correlation to thus determine the property for the hydrocarbonaceous sample. INDEPENDENT CLAIMS are included for the following:    (1) blending (M2) a petroleum-sourced fuel component with a transportation fuel-range fraction derived from a bio-oil prepared from: the thermo-catalytic conversion of biomass, or the pyrolytic conversion of biomass with subsequent upgrading, comprising: involving blending the transportation fuel-range fraction with at least one petroleum-sourced fuel component, comparing the value of the property determined from the correlation with a desired set point value, and adjusting the ratio of the transportation fuel-range fraction to the petroleum-sourced fuel component accordingly;    (2) producing (M3) bio-oil, under bio-oil production conditions of the thermo-catalytic conversion of biomass, or the pyrolytic conversion of biomass with subsequent upgrading involving: comparing the value of the property determined from the correlation with a desired set point value, and adjusting the bio-oil production conditions accordingly;    (3) process (M4) for at least partially de-watering a bio-oil prepared from: the thermo-catalytic conversion of biomass, or the pyrolytic conversion of biomass with subsequent upgrading involving: subjecting bio-oil to a voltage differential in a desalter operated under desalting conditions, comparing the value of the property determined from the correlation with a desired set point value, and adjusting voltage differential accordingly; and    (4) process (M5) for at least partially deoxygenating a bio-oil prepared from: the thermo-catalytic conversion of biomass, or the pyrolytic conversion of biomass with subsequent upgrading by: contacting the bio-oil with a de-oxygenation catalyst under de-oxygenation conditions, comparing the value of the property determined from the correlation with a desired set point value, and adjusting de-oxygenation conditions accordingly.