Abstract
Ansai Oilfield is one of the earliest discovered oilfields in the Ordos Basin. In this paper, based on the scientific exploration and exploitation, the geochemical characteristics of the Chang 2 crude oil and potential source rocks were analyzed using gas chromatography–mass spectrometry method. The correlation of biomarkers showed that the parent materials of the Chang 2 crude oil formed in freshwater-mildly brackish water environment and were sourced from low-grade aquatic organisms and terrigenous higher plants. Oil-source correlation results showed that the Chang 2 crude oil in Ansai area was derived from the source rocks of Chang 7.
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