while drill in some reservoir observed detected helium and Co2 , could we figure out the environment from this geochmical fingerprint. or we can understand the paleo- climate in these reservoir.
Mohsen,
You are not going to infer much about paleoclimates based on geochem data from hydrocarbon reservoirs. The report you get from a lab such as Isotech will include concentrations of fixed gases (He, Ar, CO2, etc) and the C1-C6+ hydrocarbons, but there is nothing in the fixed gases that can be correlated to specifically to paleoclimates ... at least, I haven't seen anything. Many of the gases are mantle-derived. As such, their occurrences and concentrations are not related to atmospheric/climatic factors of the distant past. The matter is much different, however, if you consider geochem data from aquifer systems, specifically dO-18 and dD, the abundances of which are related to temperatures of condensation, sources of moisture, etc. You should look into the large body of literature compiled by the researchers whose works have been published by the Isotope Hydrology Program of the International Atomic Energy Agency. There is enough material there to keep you busy for a very long time.
Best of luck,
BK Darling
It's related to application of stable isotopes which related to paleoclimatology for Hydrocarbon generations
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