松辽盆地东南隆起三井子地区上白垩统青山口组油页岩特征

Oil shale characteristics of Upper Cretaceous Qingshankou Formation in Sanjingzi area,Southeast uplift of Songliao Basin

以吉扶地6井为主,结合邻井资料研究了松辽盆地东南隆起三井子地区青山口组油页岩特征。吉扶地6井于1058.6~1079.9 m处青山口组中见有油页岩5层,累计厚度10.3 m,含油率(3.5~10.5)%,平均5.46%,为中等品质油页岩。具有有机质丰度高的特征,平均TOC 7.72%,有机质类型主要为I型,有机质成熟度为未熟→低熟。同时该井青山口组油页岩垂向上分布较集中,品质变化呈低→高→低→高的特征,厚度变化为薄→厚→薄→厚的特征。研究区油页岩分布特征显示,青山口组油页岩累计厚度西北大,东南小,总体含油率分布为西北高,东南低,而主矿层含油率则表现为较稳定的特征。

Based on Well JFD6 and combined with the data of adjacent wells,the characteristics of Qingshankou Formation oil shale in Sanjingzi area of southeast uplift of Songliao Basin are studied.There are 5 layers of oil shale are found in Qingshankou Formation of Well JFD6 at 1058.6~1079.9 m.The cumulative thickness is 10.3 m,oil content is(3.5~10.5)%,with an average of 5.46%,which is medium-quality oil shale.It has the characteristics of high abundance of organic matter,with an average TOC of 7.72%.The main type of organic matter is Type I,and the maturity of organic matter is immature to low maturity.At the same time,the oil shale of Qingshankou Formation in the well is distributed intensively in vertical direction,the quality change is characterized by low-high-low-high,and the thickness change is characterized by thin-thick-thin-thick.The distribution characteristics of oil shale in the study area show that the cumulative thickness of oil shale in Qingshankou Formation is large in the northwest and small in the southeast.The overall oil content distribution is high in the northwest and low in the southeast,while the oil content of the main ore bed is relatively stable.