Mesozoic Heavy Oil Source Analysis of Chepaizi Uplift in Junggar Basin
Based on the analysis results of gas chromatography-mass spectrometry(GC-MS)of the Mesozoic crude oils,the biodegradation degree of the crude oils was quantitatively evaluated,the original quality of the typical bio-markers was recovered,and the oil source of heavy oils severely biodegraded was investigated in combination with hierarchical cluster analysis and biomarker parameter recovery method to clarify the oil source of the Mesozoic heavy oils from Chepaizi Uplift in Junggar Basin.The results show that the biodegradation level of crude oils in the Meso-zoic of Chepaizi Uplift reaches more than 6(PM6),which could be subdivided into two groups:A1 and A2.The proposed biomarker parameter recovery method for oil source comparison is effective,confirming that the A1 crude oils are related to the Permian hydrocarbon source rocks of Shawan Depression,and the A2 crude oils may come from the mixing of the Permian hydrocarbon source rocks of Shawan Depression,the Carboniferous hydrocarbon source rocks of Chepaizi Uplift and the Jurassic hydrocarbon source rocks of Sikeshu Depression,which is further supported and validated by principal component analysis(PCA).The study results are an essential reference for deepening the hydrocarbon exploration and deployment in the Mesozoic of the Chepaiko Uplift.
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