oa POTENTIAL THERMAL MATURITY PARAMETERS ASSOCIATED WITH AROMATIC HYDROCARBONS IN LIGHT CRUDE OILS

In this work, we found that some conventional maturity parameters such as Ts/(Ts+Tm), C29-20S/(20S+20R), and C29-sterane-ββ/(αα+ββ) have reached an equilibrium value without changes after the high maturity stage (such as Ro%＞1.3), or breakdown and no longer applicable, and thus cannot be used to properly evaluate the thermal evolution stage of crude oil reservoirs. But the results from this present work showed that toluene (Tol) and methy cyclohexane (MCH) maybe had an inherited relationship in the oil and then the ratio of Tol/(MCH+Tol) can be applied to evaluate the thermal stage of oil reservoirs( Cheng et al,.2018 ). Furthermore 2-methy naphthalene (2-MN) and 1-methy naphthalene (1-MN) have different thermal stability, the ratios of 2-MN/(1-MN+2-MN) were linearly changed with the Easy%Ro.