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E&P Services Homepage > Oil and Gas Composition Testing >
Oil and Gas Composition
Crude Oil and Natural Gas Compositional Analysis
Intertek crude oil and natural gas laboratories across the world provide complete compositional testing of crude oil and natural gas exploration and production streams. Detailed analysis provides clients with important oil and gas reservoir data.
Oil and Gas Composition Expertise and Testing includes:
- Evolved Gas/Oil Ratio: Gas at STP per barrel of oil at specified pressure and temperature
- Oil Volume Factor: Volume at specified pressure and temperature per volume of residual oil at STP
- Density of oil phase at specified pressure and temperature
- Whole Oil Fingerprinting by Capillary Gas Chromatography
- Detailed Crude Oil Assay
- Detection and analysis of trace metals (such as mercury)
- Detection and analysis of trace compounds (such as sulfur species)
Crude Oil Compositional Analysis by Zero Psig Flash Method, Recombined Fluids, Oil & Solution Gas Recombination to psia at °F, °C.
Pressure, psia |
Temperature |
Oil Volume Factor Bo |
Oil Molecular Weight |
Gas/Oil Ratio Rs |
Single Phase Fluid Density |
Evolved Gas Gravity |
Hydrocarbon Plus (Cn+) Properties |
Selected Components, Isomers, & Cyclic Compounds |
Total and Residual Liquids |
Compositional Analysis of Crude Oil:
N2 Nitrogen |
C10 Decanes |
C24 Tetracosanes |
C38 Octatriacontanes |
CO2 Carbon Dioxide |
C11 Undecanes |
C25 Pentacosanes |
C39 Nonatriacontanes |
H2S Hydrogen Sulfide |
C12 Dodecanes |
C26 Hexacosanes |
C40 Tetracontanes |
C1 Methane |
C13 Tridecanes |
C27 Heptacosanes |
C41+ Hentetracontanes plus |
C2 Ethane |
C14 Tetradecanes |
C28 Octacosanes |
Crude Oil Assay Services |
C3 Propane |
C15 Pentadecanes |
C29 Nonacosanes |
Trace metals |
iC4 iso-Butane |
C16 Hexadecanes |
C30 Triacontanes |
Trace compounds |
nC4 n-Butane |
C17 Heptadecanes |
C31 Hentriacontanes |
Trace mercury detection |
iC5 iso-Pentane |
C18 Octadecanes |
C32 Dotriacontanes |
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nC5 n-Pentane |
C19 Nonadecanes |
C33 Tritriacontanes |
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C6 Hexanes |
C20 Eicosanes |
C34 Tetratriacontanes |
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C7 Heptanes |
C21 Henicosanes |
C35 Pentatriacontanes |
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C8 Octanes |
C22 Docosanes |
C36 Hexatriacontanes |
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C9 Nonanes |
C23 Tricosanes |
C37 Heptatriacontanes |
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Compositional Analysis of Synthesized Solution Gas:
N2 Nitrogen |
nC5 n-Pentane |
C13+ Tridecanes plus |
CO2 Carbon Dioxide |
C6 Hexanes |
Gas Gravity (air = 1.000) |
H2S Hydrogen Sulfide |
C7 Heptanes |
Heating Value |
C1 Methane |
C8 Octanes |
BTU/Ft3 (net) |
C2 Ethane |
C9 Nonanes |
Molecular Weight |
C3 Propane |
C10 Decanes |
Critical Pressure, psia |
iC4 iso-Butane |
C11 Undecanes |
BTU/Ft3 (gross) |
nC4 n-Butane |
C12 Dodecanes |
Critical Temperature, °F |
iC5 iso-Pentane |
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 Prefer to call?
Europe: +44 1708.680.248
North America:
- Toll Free USA: 1 888 400 0084
- All Others: +01 281 971 5600
Asia Pacific +65 6515 4510
 Contact or email for information
E&P Laboratory Locations:
- Intertek petroleum and gas E&P technical services support facilities and laboratories are located across the globe.
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E&P Technical Services and Research Center: Westport Technology Center
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