摘要
铜川油页岩含矿区地处鄂尔多斯盆地西南部渭北隆起区,油页岩主要发育于上三叠统延长组长7段和长6段,有机质类型为Ⅱ1和Ⅱ2型,含油率中等,处于成岩作用的未熟—低熟阶段。油页岩含油率与H/C原子比和有机碳之间存在正相关关系,当H/C原子比大于0.997或有机碳大于10.4%时方能形成油页岩。此外,可以反映有机质类型的干酪根显微组分与含油率之间也存在一定程度的相关性。铜川油页岩是在近源富含有机质的淡水还原环境中形成的,长7段沉积时发生的湖泛作用、缺氧事件与火山事件和浊流事件影响了油页岩中有机质的富集、保存条件及丰度和类型,从而影响油页岩的含油率。
Tongchuan oil shale is located in Weibei Uplifted Area southwest of Ordos Basin,and it is mainly developed in Member Chang7 and Member Chang6 of Triassic Yanchang Formation,with Ⅱ1 and Ⅱ2 organic matter,and medium oil content.And it is at the immature and low-mature stage.Oil content and TOC are positively correlated with organic carbon;oil shale could be formed when TOC is higher than 0.997 or organic carbon is higher than 10.4%.In addition,a correlation exists between kerogen maceral and oil content to a certain degree.Tongchuan oil shale is formed in fresh water and reductive surroundings rich in organic matter.Enrichment,preservation condition,abundance and type of organic matter in oil shale are affected by flooding,oxygen deficiency,volcanic event and turbidity-current event occurred as Member Chang7 deposited,and thus the oil content is influenced.
出处
《中国石油勘探》
CAS
2011年第2期79-83,88,共5页
China Petroleum Exploration
基金
国家重大专项下属子课题"油页岩有利分布区目标优选"(ZX05018-002)
