Abstract
Abstract The Cambrian–Lower Ordovician (Є-O1) and Middle–Upper Ordovician (O2–3) sourced oils from the Tarim Basin were distinguished based on their C5–C7 light hydrocarbons compositions. Relative to Є-O1 sourced oils, O2–3 sourced oils are characterized by relatively lower abundance of cycloalkanes, higher n-heptane/methylcyclohexane values (F 1.0). It seems that TSR alteration has a controlling effect on the kinetics course of C7 light hydrocarbon formation, and the abnormally high K1 values can be used as an indicator of TSR alteration in the Tarim Basin.
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