摘要
酒泉盆地青西油田的原油主要是正常密度的原油,但部分探井揭示有稠油及沥青分布。探讨稠油与沥青的形成机制有助于解决本区长期争论的烃源岩成烃演化史、生烃期次等问题。根据对稠油与沥青的物性及地化参数分析结果,对比与母源性质、沉积环境、成熟度、微生物作用有关的17项指标,认为二者与正常原油同源,均处于成熟状态,稠油主要成因为油藏内部原油的混合作用以及储集层分异作用,沥青主要成因是油田伴生气的气体脱沥青作用。
Much crude oil of the Qingxi Oilfield in Jiuquan Basin, northwest China has a normal density. However, the viscous crude and asphalt are found in some exploration wells. The study of the genesis mechanism of viscous crude and asphalt is helpful for resolving the long argued problems of the evolution and periods of the source rocks. The physical property and geochemistry parameters analysis of the viscous crude and asphalt reveals that both of them come from the same source rock and they are in the maturation state. The correlation of 17 indexes,including native rock property, sedimentary envi-ronment, maturity and microbial action,suggests both of them come from the same source rock and they are in the maturation state. The genesis of viscous crude is attributed to the crude oil mixing of internal reservoirs and the reservoir differentiation, while the viscous crude is generated from the mixture of crude oil in reservoirs and the reservoir rock differentiation and asphalt is generated by the gas de-asphalt of the associated gas of the oils.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期40-41,共2页
Petroleum Exploration and Development
关键词
酒泉盆地
青西油田
稠油
沥青
形成机制
Jiuquan Basin
Qingxi Oilfield
viscous crude
asphalt
genesis mechanism
