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吐哈盆地台北凹陷西部原油生物标志化合物组成具“多样性”特点,经油源对比研究可知该区原油总体上可区分为源自中、下侏罗统水西沟群煤系源岩的“煤系”原油和源自中侏罗统七克台组湖相源岩的原油,因此,原油是由七克台组湖相源岩和水西沟群煤系源岩共同贡献的“混源油”。实验研究揭示了浓度差异是“混源油”生物标志化合物特征变异的重要控制因素,推测台北凹陷西部目前发现的“混源油”中大多仍以水西沟群煤系源岩贡献为主,少数原油湖相源岩贡献可达50%以上。
The composition of the biomarker compounds in the western part of the Taibei Sag in Turpan-Hami Basin is characterized by “diversity”. According to the comparative study of oil sources, the crude oil in this area can be generally divided into “ Coal ”crude oil and crude oil from the Caledonian source rocks of the Qijia Formation in the Middle Jurassic. Therefore, the crude oil is derived from the“ mixed source oil”. The experimental study revealed that the concentration difference is an important controlling factor for the characteristic variation of bio-oil compounds. It is speculated that most of the “mixed oil” found in the western part of the Taipei sag still mostly contributes to the source rocks of the Shui Xigou Group, A small number of crude oil lake source rock contribution up to 50%.