Abstract:

Applying satisfied hydrocarbon biomarker , aromatic hydrocarbon, carbon isotope, light hydrocarbon and other geochemistry analytical data, with a combination of many approaches, a detailed research on oil-oil correlation and oil-source correlation in three oil fields in Dawangbei sag was given. The result indicates that, the crude oil in Dawangbei sag has four genetic types, Es₃ crude oil from Es₃ source rock,  Es₄ crude oil from Es₄ source rock, Es₁ crude oil from Es₁ source rock and mixed oils from two series or three series of source rocks. Es₃ crude oil distributes on the Dawangbei oil field and Da 65 oil field. Yingxiongtan oil field has all other types of crude oil, which gives priority to mixed oils affected by Es₃ source rock. The main source rock in Dawangbei sag, which contributed to the major reservoir, is the Es₃ source rock. The distribution of crude oil types was controlled by the genetic potentials of different source rocks, hydrocarbon generation history and development history of traps.

Key words: Dawangbei sag, biomarker, oil-source correlation, types of crude oil