摘要
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 differentia in complex oil-source area was a highlight and difficult issue in petroleum geological and geochemical studies.In order to provide a new method of complement,a case study was carried out in the central Junggar Basin by using micro-FTIR technique and analysis of hydrocarbon components in reservoir organic matters and organic inclusions.Good results are obtained,it indicates that this is possibly a novel and effective method.Analytical results show that the oil-source difference in the studied area is caused mainly by different sources.Reservoir oils are composed mainly of relatively high mature and light oils with short chains.They are characterized by typical FTIR parameters of ΣCH2/ΣCH3>5.0,Xinc>40 and Xstd>20.This indicates that the reservoir mixed oils are dominated by those derived from Middle Permian Lower Wu'erhe Formation.In contrast,the oils that are sourced from the Lower Permian Fengcheng Formation and Jurassic have relatively limited contribution.These results provide new geochemical evidence for investigating the oil-source difference in the studied area,and the FTIR method may have general significance in addressing oil source.
出处
《石油天然气学报》
CAS
CSCD
2013年第8期13-16,0+6,共4页
Journal of Oil and Gas Technology
基金
中国石油天然气股份有限公司重大科技专项(2012E-34-01)
