摘要
彭阳-崇信地区位于鄂尔多斯盆地西南缘,由于与长7段生烃中心相距较远,不同的研究人员对其长8段油源有着不同的认识。以原油与烃源岩的饱和烃色谱、色谱-质谱特征为依据,利用聚类分析等方法,综合多项生物标志化合物参数,多角度探讨了西南缘长8段的油源。研究结果表明:区内与生烃中心的长7段烃源岩分别属于2个不同的类型,北部彭阳地区的长8段原油由生烃中心腐泥型的长7段烃源岩生成,成熟度较高,南部平凉地区长8段原油由区内腐殖型的长7段烃源岩生成,成熟度较低;区内长8段原油分布的差异性主要受控于烃源岩的有机碳质量分数,低有机碳质量分数的平凉地区烃源岩生排烃量只能满足本地成藏,彭阳地区的长7段泥岩缺乏相应的生排烃能力,只能由生烃中心的原油异地充注成藏。
Located in the southwest of Ordos Basin, Pengyang-Chongxin region is far away from hydrocarbon generating center of source rocks in Chang 7 Section. There are different views on the oil sources of Chang 8 Section. Based on the results of GC and GC- MS analysis on crude oil with source rock＇s saturated hydrocarbons, the distribution characteristics of a series of biomarkers have been depicted. Combining these biochemical parameters, the oil sources of Chang 8 Section are discussed from multiple aspects by the way of manovacluster analysis and other methods of oil-source rock correlation. The study results show that the Chang 7 source rocks in this two areas belong to two types in the area of hydrocarbon generating center and Pingliang area. The maturity of Chang 8 crude oil accumulated in Pengyang area is higher than Pingliang area, and it is generated by Chang 7 source rock in the area of hydrocarbon generation center. Whereas Chang 8 crude oil in Pingliang area was generated by Chang 7 source rock which is located in the same area with the oil. The distribution differences of Chang 8 crude oil among different areas are mainly controlled by the distribution difference of TOC. For the reason of lower TOC, the quantity of hydrocarbon generation and expulsion by Chang 7 source rock in Pingliang area can only afford to meet native accumulation in Chang 8 Section. The Chang 7 source rock of Pengyang area lacks the capability of hydrocarbon generation and expulsion so that the trap of Chang 8 Section in this area cannot but be injected by crude oil generated in hydrocarbon generating center of Chang 7 source rock.
作者
白青林
杨少春
马芸
来又春
荆亚云
BAI Qinglin;YANG Shaochun;MA Yun;LAI Youchun;JING Yayun(School of Geosciences,China University of Petroleum,Qingdao 266580,China;Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)
出处
《断块油气田》
CAS
北大核心
2018年第6期689-694,共6页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题"低渗-致密油藏描述新方法与开发模式"(2017ZX05009-001)
