摘要
为了明确春光探区原油特征,首先开展了周缘凹陷烃源岩评价,确定了各层系烃源岩地球化学特征。在原油地球化学特征精细剖析的基础上,将春光探区原油划分为3类,并根据生物标志物组合特征和成藏期次研究结果对原油和烃源岩进行了对比研究。结果表明:第Ⅰ类原油(轻质油)分布于新近系沙湾组和西部侏罗系,主要来自于侏罗系烃源岩;第Ⅱ类原油(中质油)分布于古近系和沙湾组,来自于侏罗系和二叠系烃源岩;第Ⅲ类原油(稠油)分布于东部侏罗系、白垩系和沙湾组,侏罗系、白垩系稠油是次生油藏,二叠系烃源岩生成的原油在白垩纪末期成藏,后遭受水洗破坏,侏罗系烃源岩生成的原油又在新近纪充注成藏。沙湾组稠油是原生油藏,其中降解部分是白垩系稠油通过断层向上运移的,未降解部分是侏罗系烃源岩生成的原油。
In order to understand the characteristics of the crude oil in Chunguang exploration area, the hydrocarbon source rocks a-round the exploration area are evaluated, and the geochemical characteristics of the source rocks are determined. Based on the analysisof the geochemical characteristics of the crude oil in Chunguang exploration area, the crude oil is classified into three types. The correla-tion between the crude oil and the hydrocarbon source rocks is researched according to the combination features of biomarkers and theresearch results of hydrocarbon accumulation period and time. It is shown that ： I type of the crude oil （ light oil） occurs in NeogeneShawan formation and the Jurassic in the west,and it is mainly from Jurassic source rocks. I] type of the crude oil （intermediate oil）oc-curs in Neogene Shawan formation and Paleogene, and it is from Jurassic and Permian source rocks. III type of the crude oil （heavy oil）occurs in Jurassic, Cretaceous and Neogene Shawan formation in the east. The heavy oil reservoir of Jurassic and Cretaceous is secondaryreservoirs, the crude oil generated by Permian source rocks formed oil pools in the end of the Cretaceous, then the pools were destroyedby water washing and the crude oil generated by Jurassic source rocks accumulated again in Neogene. The heavy oil reservoirs of Shawanformation is native reservoirs, the degraded part of the heavy oil is the Cretaceous heavy oil migrating upwards through faults, and theun-degraded part is from the source rocks of Jurassic.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2016年第1期37-44,共8页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
中石化重大科技攻关项目(编号:P12020)
关键词
烃源岩
生物标志物
油源对比
成藏期次
春光探区
准噶尔盆地
hydrocarbon source rock
biomarker
oil-source correlation
period and time of oil and gas accumulation
Chunguang explo-ration area
Junggar Basin
