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Based on the thermodynamic stability and hy- drogen bond mechanisms, alkyldibenzothiophene molecular ratios, 4-/1-MDBT, 2,4-/1,4- and 4,6-/1,4-DMDBT, are used to characterize organic maturity and oil migration, which can act as molecular tracers for the filling orientation and path- way in oil reservoir. The application of aforesaid molecular parameters, in a Neogene sandstone reservoir of the XJ24-3 Oilfield, Zhujiangkou Basin and in an Ordovician carbonate reservoir of Karst pore-fissure-network type in the Tahe Oil- field, Tarim Basin, manifests that those ratios are reliable tracers compared with other molecular ratios, and thus, al- kyldibezothiophene parameters may be used in a wide range of maturity, especially for high- to post-mature oil and se- verely biodegraded oil, both of which are short of effective molecular parameters.
Based on the thermodynamic stability and hy- drogen bond mechanisms, alkyldibenzothiophene molecular ratios, 4- / 1-MDBT, 2,4- / 1,4- and 4,6- / 1,4-DMDBT, are used to characterize organic maturity and oil migration, which can act as molecular tracers for the filling orientation and path-way in oil reservoir. The application of aforesaid molecular parameters, in a Neogene sandstone reservoir of the XJ 24-3 Oilfield, Zhujiangkou Basin and in an Ordovician carbonate reservoir of Karst pore-fissure-network type in the Tahe Oil field, Tarim Basin, manifests that those ratios are reliable tracers compared with other molecular ratios, and thus, al- kyldibezothiophene parameters may be used in a wide range of maturity, especially for high - to post-mature oil and se verely biodegraded oil, both of which are short of effective molecular parameters.