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复杂油源区的油源及其差异性研究是当前石油地质地球化学研究的热点和难点。为探索新的方法补充,以准噶尔盆地中部地区为例,尝试开拓应用显微傅里叶红外光谱技术,通过分析储层有机质和有机包裹体的烃类组成来开展研究,取得良好效果,表明这可能是一种新的方法。研究结果显示,研究区油源的差异主要是因为油源区的不同,并且储层原油以相对高成熟的短链烃轻质油(ΣCH2/ΣCH3>5.0、Xinc>40、Xstd>20)为主,即混源油中以中二叠统下乌尔禾组生源油占优势;相比而言,下二叠统风城组和侏罗系生源油虽然亦存在,但对原油聚集的贡献程度相对较低。这些认识为区域油源差异性研究提供了新的地球化学证据,通过红外光谱研究油源的工作思路也具有普遍参考意义。
The study of oil source and its difference in complex oil source areas is a hot and difficult point in current petroleum geology and geochemistry research. In order to explore the new method to supplement, taking the central part of Junggar Basin as an example, we try to open up the application of the micro-FTIR spectroscopy and carry out the research by analyzing the hydrocarbon composition of reservoir organic matter and organic inclusions. The results show that May be a new method. The results show that the difference of oil source in the study area is mainly due to the difference of oil source areas, and that of crude oil with relatively high maturity (ΣCH2 / ΣCH3> 5.0, Xinc> 40, Xstd> 20) The main source, ie, mixed source oil, is dominated by the Lower Wuerhe Formation source oil in the Middle Permian. In contrast, the Lower Permian Fencheng Formation and Jurassic source oil, although present, contribute to the accumulation of crude oil The degree is relatively low. These understandings provide new geochemical evidence for the study of regional oil source variability. It is also of universal significance to study the oil source through infrared spectroscopy.