BTU Analysis Using a Gas Chromatograph. Application Note. Oil & Gas ... Gas chromatography is normally employed for the calculation of and calculation of results are done in the controller which can be
Hi Mohamed
When you use the GC to analysis the hydrocarbons, you will receive a answer like attached photo. You can see in this photo every components of Carbon has a peak, means what is the probability of this components in tested hydrocarbon.
The components of Carbons is different in in petroleum and gas. The application of GC and especially GC-mass in Geochemistry is identification the produced hydrocarbon by using the study on organic materials, ex. material which produce gas has a tall peak in c 27 but distribution of components in material which produce petroleum is in first part of plotted answer.
Dear Mohammed,
Your best shot on this is conversion of Mass Fraction from Chromatography to Mole Fraction using molecular weights from tables in literature (approximated) unless you have already measured the molecular weights and you have Chromatography plus MW measurements which then you should use (more accurate).
As per attached classification, use the rule that molecular weight for C7+ fraction is >50% for heavy oil.
Also, you can back calculate the total molecular weight of the fluid by using:
MWtotal= Mol_Fraction_X1 * MW_X1 + Mol_Fraction_X2 * MW_X2 .. etc (where X1 = CO2, X2 = CH4 .. etc)
Or use the measured value and as shown in the attached picture, another criteria is MWtotal is 210+ for heavy oil.
Please note that there are other criteria for the fluid to be classified as heavy oil like viscosity, saturation pressure, API .. etc which should be taken into considerations in addition to what is mentioned above.
All the best
http://petrowiki.org/File%3AVol5_Page_0897_Image_0001.png
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